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G Bhagavannarayana - One of the best experts on this subject based on the ideXlab platform.

  • studies on bulk growth structural and microstructural characterization of 4 aminobenzophenone single crystal grown from vertical Bridgman Technique
    Bulletin of Materials Science, 2014
    Co-Authors: S P Prabhakaran, G Bhagavannarayana, Ramesh R Babu, K Ramamurthi
    Abstract:

    Bulk single crystal of 4-aminobenzophenone with a size of 25 mm dia. and 35 mm length has been grown by vertical Bridgman Technique. The crystal system of the grown crystal was confirmed by X-ray diffraction analysis. Crystalline perfection was analysed by high resolution X-ray diffraction studies. Chemical etching was carried out for the first time in 4-aminobenzophenone single crystal to study the defects presented in the grown crystal and the growth mechanism involved. Several organic etchants were employed with different etching time to select suitable etchant for studying dislocation pattern and other structural defects existing in the grown crystal. Etch patterns such as spirals and striations observed for the selective etchants provide considerable information on growth mechanism of the crystal.

  • growth and characterization of organic material 2 hydroxypyridine single crystal by modified vertical Bridgman Technique
    Materials Chemistry and Physics, 2011
    Co-Authors: Narayana Perumal Rajesh, T Suthan, C K Mahadevan, D Sajan, G Bhagavannarayana
    Abstract:

    Abstract Large size (15 mm diameter and 80 mm length) organic material 2-hydroxypyridine single crystal has been grown using the double wall ampoule with nano translation by modified vertical Bridgman Technique for the first time. Material of the grown crystal was confirmed by single and powder X-ray diffraction (XRD) measurements. Fourier transform infrared (FTIR) analysis was used to identify the functional groups present in the grown crystal. High resolution X-ray diffraction (HRXRD) has been performed to analyze the crystalline perfection of the grown single crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal characteristics of the grown crystal were analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies at various temperatures ranging from 308 to 373 K and the results indicate an increase in the dielectric parameters with the increase of temperature at all frequencies. The second harmonic generation (SHG) studies were used to analyze the nonlinear optical property of the grown crystal.

  • growth and characterization of organic material 2 methylamino 5 chlorobenzophenone single crystal by modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
    Co-Authors: T Suthan, Narayana Perumal Rajesh, C K Mahadevan, Senthil K Kumar, G Bhagavannarayana
    Abstract:

    Abstract The organic material 2-methylamino-5-chlorobenzophenone single crystal has been grown by modified vertical Bridgman Technique using the single wall ampoule with nano translation. The grown crystal was confirmed by single crystal and powder X-ray diffraction analyses. Fourier transform infrared analysis was used to identify the functional groups present in the grown crystal. High resolution X-ray diffraction studies show the crystalline perfection of the grown crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence spectral studies. The thermal behavior of the grown crystal was analyzed by thermogravimetric and differential thermal analyses. The dielectric measurements of the grown crystal were carried out with different frequencies and temperatures and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The microhardness measurements were performed to analyze the mechanical property of the grown crystal.

  • growth and characterization of 2 hydroxy 4 methoxybenzophenone single crystal using modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
    Co-Authors: T Suthan, Narayana Perumal Rajesh, C K Mahadevan, G Bhagavannarayana
    Abstract:

    The 2-hydroxy-4-methoxybenzophenone single crystal has been grown by the modified vertical Bridgman Technique using the double wall ampoule. The grown crystal was confirmed by single and powder X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy analyses. High resolution X-ray diffraction (HRXRD) analysis indicates the crystalline perfection of the grown crystal. The cutoff wavelength of the grown crystal was analyzed by optical studies. The dielectric measurements were carried out and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The thermal property of the grown crystal was studied by thermo gravimetric (TG) and differential thermal analyses (DTA).

  • growth and properties of benzil doped benzimidazole bmz single crystals
    Materials Research Bulletin, 2010
    Co-Authors: Ramesh R Babu, M Sukumar, V Vasudevan, Mohd Shakir, K Ramamurthi, G Bhagavannarayana
    Abstract:

    In the present work, we have made an attempt to study the effect of benzil doping on the properties of benzimidazole single crystals. For this purpose we have grown pure and benzil doped benzimidazole single crystals by vertical Bridgman Technique. The grown crystals were characterized by various characterization Techniques. The presence of dopants confirmed by powder X-ray diffraction (XRD). Crystalline perfection of the grown crystals has been analysed by high-resolution X-ray diffraction (HRXRD). The transmittance, electrical property and mechanical strength have been analysed using UV-vis-NIR spectroscopic, dielectric and Vicker's hardness studies. The relative second harmonic generation efficiency of pure and doped benzimidazole crystals measured using Kurtz powder test.

Narayana Perumal Rajesh - One of the best experts on this subject based on the ideXlab platform.

  • Investigation on crystal growth and characterization of organic nonlinear optical triphenylmethane single crystal by vertical Bridgman Technique
    Journal of Crystal Growth, 2018
    Co-Authors: T. Arivazhagan, S. Siva Bala Solanki, Narayana Perumal Rajesh
    Abstract:

    Abstract An organic triphenylmethane (TPM) single crystal of length 58 mm and diameter 12 mm was grown by vertical Bridgman Technique. The cell parameters of the grown crystal were confirmed by single crystal X-ray diffraction studies. Powder X-ray diffraction analysis was used to determine the crystalline nature of the triphenylmethane crystal. The functional groups of the triphenylmethane crystal were identified by Fourier transform infrared analysis. The linear optical property of the grown triphenylmethane crystal was studied by UV–Vis–NIR spectroscopic analysis which shows that the crystal has low cutoff wavelength at 281 nm and exhibits optical band gap value at 4.15 eV. The fluorescence spectrum indicates that the grown crystal emits blue light. The second harmonic conversion efficiency of the crystal was determined using Kurtz and Perry powder Technique. The thermal property of the grown crystal was analysed using thermo gravimetric analysis, differential thermal analysis and differential scanning calorimetry. The dielectric constant, dielectric loss and AC conductivity of the grown crystal was investigated for different frequency range upto 1 MHz at various temperatures. The strength of the crystal was estimated by Vicker’s hardness test and laser damage studies.

  • growth and characterization of butyl 4 hydroxybenzoate single crystal by vertical Bridgman Technique for third order nonlinear optical applications
    Optics and Laser Technology, 2017
    Co-Authors: T. Arivazhagan, Siva Bala S Solanki, Narayana Perumal Rajesh
    Abstract:

    Abstract The butyl 4-hydroxybenzoate single crystal has been grown by vertical Bridgman Technique using single wall ampoule. The cell parameters of the grown crystal are verified by single crystal X-ray diffraction analysis. The functional groups of the grown crystal were identified by Fourier transform infrared analysis. The melting, decomposition and crystallization point of the compound are determined by thermo gravimetric analysis and differential scanning calorimetric analysis. The mechanical properties of the grown crystal has been analyzed by Vickers microhardness method. The optical behavior of the grown crystal has been observed by UV–vis–NIR transmission spectroscopic analysis which shows that the lower cut-off wavelength lying at 293 nm and found that the energy band gap value is 4.05 eV. The blue light emission of the crystal was identified by photoluminescence studies. The positive third order nonlinear optical parameters like nonlinear refractive index (n2), nonlinear absorption co-efficient (β) and third order nonlinear susceptibility (χ3) of the grown crystal was calculated by Z-scan studies. The positive sign of nonlinear refractive index (n2) indicates that the crystal exhibits self focusing optical nonlinearity. The crystal exhibits good optical power limiting behavior.

  • investigation on the growth and characterization of nonlinear optical single crystal 4 4 dimethoxybenzoin by vertical Bridgman Technique
    Optics and Laser Technology, 2014
    Co-Authors: T. Arivazhagan, Narayana Perumal Rajesh
    Abstract:

    Abstract An organic nonlinear optical (NLO) material 4,4׳-dimethoxybenzoin single crystal has been grown by vertical Bridgman Technique using single wall ampoule. The grown crystal was confirmed by single crystal and powder X-ray diffraction (XRD) analyses. The functional groups of the grown crystal were identified by Fourier transform infra red analysis. The thermal behavior of the grown crystal were studied by thermo gravimetric (TG) and differential scanning calorimetric (DSC) analysis. The UV–vis–NIR spectrum has been recorded in the range 190–1100 nm and it shows that the cutoff wavelength of grown crystal is around 343 nm. The yellow emission of the grown crystal was identified by photoluminescence (PL) spectral measurements. The NLO property of the grown crystal was confirmed by Kurtz and Perry powder Technique and the SHG efficiency of the grown crystal was found to be 2 times greater than KDP. The dielectric measurements were carried out and the results indicate that an increase in dielectric parameters with increase of temperature at all frequencies.

  • growth and characterization of organic material 3 hydroxybenzaldehyde single crystal by modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012
    Co-Authors: T Suthan, P V Dhanaraj, Narayana Perumal Rajesh
    Abstract:

    Abstract Novel organic nonlinear optical (NLO) material 3-hydroxybenzaldehyde (3HBA) single crystals have been grown by modified vertical Bridgman Technique using the single and double wall ampoules with nano translation. Single crystal X-ray diffraction analysis reveals that 3HBA crystallizes in orthorhombic system and the powder X-ray diffraction (XRD) pattern was indexed. Fourier transform infrared studies confirm the functional groups of the crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal property of the grown crystal was analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies at various temperatures ranging from 308 to 373 K and the results indicate an increase in dielectric parameters with the increase of temperature at all frequencies. The NLO property of 3HBA was analyzed by second harmonic generation (SHG) studies.

  • growth and characterization of organic material 2 hydroxypyridine single crystal by modified vertical Bridgman Technique
    Materials Chemistry and Physics, 2011
    Co-Authors: Narayana Perumal Rajesh, T Suthan, C K Mahadevan, D Sajan, G Bhagavannarayana
    Abstract:

    Abstract Large size (15 mm diameter and 80 mm length) organic material 2-hydroxypyridine single crystal has been grown using the double wall ampoule with nano translation by modified vertical Bridgman Technique for the first time. Material of the grown crystal was confirmed by single and powder X-ray diffraction (XRD) measurements. Fourier transform infrared (FTIR) analysis was used to identify the functional groups present in the grown crystal. High resolution X-ray diffraction (HRXRD) has been performed to analyze the crystalline perfection of the grown single crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal characteristics of the grown crystal were analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies at various temperatures ranging from 308 to 373 K and the results indicate an increase in the dielectric parameters with the increase of temperature at all frequencies. The second harmonic generation (SHG) studies were used to analyze the nonlinear optical property of the grown crystal.

T Suthan - One of the best experts on this subject based on the ideXlab platform.

  • growth and characterization of organic material 3 hydroxybenzaldehyde single crystal by modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012
    Co-Authors: T Suthan, P V Dhanaraj, Narayana Perumal Rajesh
    Abstract:

    Abstract Novel organic nonlinear optical (NLO) material 3-hydroxybenzaldehyde (3HBA) single crystals have been grown by modified vertical Bridgman Technique using the single and double wall ampoules with nano translation. Single crystal X-ray diffraction analysis reveals that 3HBA crystallizes in orthorhombic system and the powder X-ray diffraction (XRD) pattern was indexed. Fourier transform infrared studies confirm the functional groups of the crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal property of the grown crystal was analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies at various temperatures ranging from 308 to 373 K and the results indicate an increase in dielectric parameters with the increase of temperature at all frequencies. The NLO property of 3HBA was analyzed by second harmonic generation (SHG) studies.

  • growth and characterization of organic material 2 hydroxypyridine single crystal by modified vertical Bridgman Technique
    Materials Chemistry and Physics, 2011
    Co-Authors: Narayana Perumal Rajesh, T Suthan, C K Mahadevan, D Sajan, G Bhagavannarayana
    Abstract:

    Abstract Large size (15 mm diameter and 80 mm length) organic material 2-hydroxypyridine single crystal has been grown using the double wall ampoule with nano translation by modified vertical Bridgman Technique for the first time. Material of the grown crystal was confirmed by single and powder X-ray diffraction (XRD) measurements. Fourier transform infrared (FTIR) analysis was used to identify the functional groups present in the grown crystal. High resolution X-ray diffraction (HRXRD) has been performed to analyze the crystalline perfection of the grown single crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal characteristics of the grown crystal were analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies at various temperatures ranging from 308 to 373 K and the results indicate an increase in the dielectric parameters with the increase of temperature at all frequencies. The second harmonic generation (SHG) studies were used to analyze the nonlinear optical property of the grown crystal.

  • growth and characterization of organic material 2 methylamino 5 chlorobenzophenone single crystal by modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
    Co-Authors: T Suthan, Narayana Perumal Rajesh, C K Mahadevan, Senthil K Kumar, G Bhagavannarayana
    Abstract:

    Abstract The organic material 2-methylamino-5-chlorobenzophenone single crystal has been grown by modified vertical Bridgman Technique using the single wall ampoule with nano translation. The grown crystal was confirmed by single crystal and powder X-ray diffraction analyses. Fourier transform infrared analysis was used to identify the functional groups present in the grown crystal. High resolution X-ray diffraction studies show the crystalline perfection of the grown crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence spectral studies. The thermal behavior of the grown crystal was analyzed by thermogravimetric and differential thermal analyses. The dielectric measurements of the grown crystal were carried out with different frequencies and temperatures and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The microhardness measurements were performed to analyze the mechanical property of the grown crystal.

  • growth and characterization of 2 hydroxy 4 methoxybenzophenone single crystal using modified vertical Bridgman Technique
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
    Co-Authors: T Suthan, Narayana Perumal Rajesh, C K Mahadevan, G Bhagavannarayana
    Abstract:

    The 2-hydroxy-4-methoxybenzophenone single crystal has been grown by the modified vertical Bridgman Technique using the double wall ampoule. The grown crystal was confirmed by single and powder X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy analyses. High resolution X-ray diffraction (HRXRD) analysis indicates the crystalline perfection of the grown crystal. The cutoff wavelength of the grown crystal was analyzed by optical studies. The dielectric measurements were carried out and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The thermal property of the grown crystal was studied by thermo gravimetric (TG) and differential thermal analyses (DTA).

  • growth and characterization of organic material 4 nitrobenzaldehyde single crystal using modified vertical Bridgman Technique
    Journal of Crystal Growth, 2010
    Co-Authors: T Suthan, Narayana Perumal Rajesh
    Abstract:

    Abstract The organic material 4-nitrobenzaldehyde single crystal has been grown using the single wall ampoule with nano-translation by modified vertical Bridgman Technique. The grown crystal was confirmed by single and powder X-ray diffraction (XRD). Fourier transform infrared (FTIR) analysis was used to identify the functional groups present in the grown crystal. The optical property of the grown crystal was analyzed by UV–vis–NIR and photoluminescence (PL) spectral measurements. The thermal characteristics of the grown crystal were analyzed by thermogravimetric (TG) and differential thermal analyses (DTA). The dielectric measurements were carried out with four different frequencies and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The microhardness measurements were used to analyze the mechanical property of the grown crystal.

P Ramasamy - One of the best experts on this subject based on the ideXlab platform.

  • growth improvement of aggase2 single crystal using the vertical Bridgman Technique with steady ampoule rotation and its characterization
    Journal of Crystal Growth, 2012
    Co-Authors: Anandha G Babu, P Ramasamy, N Karunagaran, Perumal R Ramasamy, S Ganesamoorthy, P K Gupta
    Abstract:

    The polycrystalline charges were successfully synthesized from high purity elemental starting materials by the vapor transport method with the mechanical and melt temperature oscillation. High pure, single phase, free of voids and crack-free AgGaSe2 single crystals have been grown by the vertical Bridgman Technique with steady ampoule rotation. The structural perfection of the grown crystals has been analyzed by high-resolution X-ray diffraction (HRXRD) rocking curve measurements. AgGaSe2 has been studied using differential scanning calorimetry (DSC) Technique. The stoichiometric composition of AgGaSe2 was measured using energy dispersive spectrometry (EDS). The insignificant change in atomic percentages of Ag, Ga and Se along the ingot further reveals that the composition throughout its length is fairly homogeneous. The band gap and melting point along the length of the ingot are studied. The structural and compositional uniformities of AgGaSe2 were studied using micro-Raman scattering spectroscopy at room temperature. The insignificant change in the FWHM of the Γ1(W1) measured at different regions of the crystal further reveals that the composition throughout its length is fairly uniform. As grown single crystal shows very high IR transmission of ∼72% in the spectral range 4000–530 cm−1.

  • synthesis growth and characterization of 3 nitroacetanilide a new organic nonlinear optical crystal by Bridgman Technique
    Journal of Crystal Growth, 2008
    Co-Authors: M Lenin, P Ramasamy
    Abstract:

    Abstract Single crystals of 3-nitroacetanilide, an organic nonlinear optical material has been grown by the Bridgman–Stockbarger method. The single crystal X-ray diffraction (XRD) data revealed the noncentrosymmetric crystal structure, which is an essential criterion for second harmonic generation. The crystalline nature of the grown crystals was confirmed using powder XRD Techniques. The functional group of the compound is identified by FTIR spectrum. The thermal stability and its tendency to grow as single crystal in solution and in melt have been identified for the new title compound. The UV–vis spectrum of mNAA shows the lower optical cut off at 400 nm and was transparent in the visible region. The second harmonic generation efficiency was found using Kurtz powder Technique. The dielectric constant and dielectric loss of the crystal were measured as a function of frequency and temperature, and the results are discussed.

  • growth of 2 5 diphenyloxazole doped naphthalene crystal by Bridgman method and its fluorescence studies
    Journal of Crystal Growth, 2008
    Co-Authors: N B Balamurugan, A Arulchakkaravarthi, P Ramasamy
    Abstract:

    Abstract An attempt was made to grow naphthalene single crystals doped with various concentrations, ranging from 0.01 to 0.07 mol% of 2,5-diphenyloxazole (PPO). The crystals were grown from melts by a self-seeding vertical Bridgman Technique (SSVBT), in a transparent two-zone furnace. In the present work, a flat interface was maintained for all runs. The optimum crystal growth rates were observed as 1 mm/h for pure and 0.01 mol% PPO-doped naphthalene, 0.7 mm/h for 0.03 mol% and 0.5 mm/h for 0.05 and 0.07 mol%-doped naphthalene. The fluorescence studies were carried out and it reveals the possibility of making a crystal scintillator with PPO impurity.

  • a comparative study on solution and Bridgman grown single crystals of benzimidazole by high resolution x ray diffractometry fourier transform infrared microhardness laser damage threshold and second harmonic generation measurements
    Crystal Growth & Design, 2006
    Co-Authors: N Vijayan, G Bhagavannarayana, Ramesh R Babu, R Gopalakrishnan, K K Maurya, P Ramasamy
    Abstract:

    Nowadays more attention has been paid to the growth of organic nonlinear optical single crystals due to their high nonlinear optical efficiency and fairly good optical damage threshold comparable to that of inorganic counterparts. The organic nonlinear optical single crystals of benzimidazole (BMZ) grown by the slow evaporation solution growth Technique (SEST) and the vertical Bridgman Technique (VBT) were characterized, and their results have been compared. Characterization has been made by high-resolution X-ray diffractometry (HRXRD), Fourier transform infrared (FTIR), laser damage threshold, microhardness, and second-harmonic generation (SHG) measurement studies. The high-resolution X-ray diffraction curves (DCs) recorded by an in-house developed multicrystal X-ray diffractometer (MCD) revealed that the crystals grown by both methods contain internal structural grain boundaries. However, VBT crystals normally contain multiple low angle (tilt angle α ≥ 1 arc min) boundaries due to thermal stress caused ...

  • growth of organic molecular single crystal trans stilbene by selective self seeding from vertical Bridgman Technique
    Journal of Crystal Growth, 2002
    Co-Authors: A Arulchakkaravarthi, P Jayavel, P Santhanaraghavan, P Ramasamy
    Abstract:

    Single crystal growth of organic molecular materials by melt growth is plagued by serious difficulties owing to poor thermal conductivity, non-availability of good seed etc. Of all the melt growth Techniques, Bridgman Technique is widely preferred because of the low cost, versatility, easy adaptability, simple instrumentation etc. In the Bridgman Technique the control on the formation/birth of the first single nuclei is still an art and in this paper we have proposed a selective self seeding Technique for initiating single crystal growth. Trans-stilbene crystals have been grown using vertical Bridgman Technique and using a modified ampoule design. Trans-stilbene crystal grown by using conventional method and by the present method were characterized for quality assessment by DCD and time resolution measurements.

Ramesh R Babu - One of the best experts on this subject based on the ideXlab platform.

  • studies on bulk growth structural and microstructural characterization of 4 aminobenzophenone single crystal grown from vertical Bridgman Technique
    Bulletin of Materials Science, 2014
    Co-Authors: S P Prabhakaran, G Bhagavannarayana, Ramesh R Babu, K Ramamurthi
    Abstract:

    Bulk single crystal of 4-aminobenzophenone with a size of 25 mm dia. and 35 mm length has been grown by vertical Bridgman Technique. The crystal system of the grown crystal was confirmed by X-ray diffraction analysis. Crystalline perfection was analysed by high resolution X-ray diffraction studies. Chemical etching was carried out for the first time in 4-aminobenzophenone single crystal to study the defects presented in the grown crystal and the growth mechanism involved. Several organic etchants were employed with different etching time to select suitable etchant for studying dislocation pattern and other structural defects existing in the grown crystal. Etch patterns such as spirals and striations observed for the selective etchants provide considerable information on growth mechanism of the crystal.

  • growth and properties of benzil doped benzimidazole bmz single crystals
    Materials Research Bulletin, 2010
    Co-Authors: Ramesh R Babu, M Sukumar, V Vasudevan, Mohd Shakir, K Ramamurthi, G Bhagavannarayana
    Abstract:

    In the present work, we have made an attempt to study the effect of benzil doping on the properties of benzimidazole single crystals. For this purpose we have grown pure and benzil doped benzimidazole single crystals by vertical Bridgman Technique. The grown crystals were characterized by various characterization Techniques. The presence of dopants confirmed by powder X-ray diffraction (XRD). Crystalline perfection of the grown crystals has been analysed by high-resolution X-ray diffraction (HRXRD). The transmittance, electrical property and mechanical strength have been analysed using UV-vis-NIR spectroscopic, dielectric and Vicker's hardness studies. The relative second harmonic generation efficiency of pure and doped benzimidazole crystals measured using Kurtz powder test.

  • a comparative study on solution and Bridgman grown single crystals of benzimidazole by high resolution x ray diffractometry fourier transform infrared microhardness laser damage threshold and second harmonic generation measurements
    Crystal Growth & Design, 2006
    Co-Authors: N Vijayan, G Bhagavannarayana, Ramesh R Babu, R Gopalakrishnan, K K Maurya, P Ramasamy
    Abstract:

    Nowadays more attention has been paid to the growth of organic nonlinear optical single crystals due to their high nonlinear optical efficiency and fairly good optical damage threshold comparable to that of inorganic counterparts. The organic nonlinear optical single crystals of benzimidazole (BMZ) grown by the slow evaporation solution growth Technique (SEST) and the vertical Bridgman Technique (VBT) were characterized, and their results have been compared. Characterization has been made by high-resolution X-ray diffractometry (HRXRD), Fourier transform infrared (FTIR), laser damage threshold, microhardness, and second-harmonic generation (SHG) measurement studies. The high-resolution X-ray diffraction curves (DCs) recorded by an in-house developed multicrystal X-ray diffractometer (MCD) revealed that the crystals grown by both methods contain internal structural grain boundaries. However, VBT crystals normally contain multiple low angle (tilt angle α ≥ 1 arc min) boundaries due to thermal stress caused ...