The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
S. C. Mojumdar - One of the best experts on this subject based on the ideXlab platform.
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Crystal growth and characterization of Mixed Crystal potassium zinc vanadium sulphate
Journal of Thermal Analysis and Calorimetry, 2014Co-Authors: J. Vijila Manonmoni, G Ramasamy, Subbiah Meenakshisundaram, M. Amutha, S. C. MojumdarAbstract:Mixed Crystal, potassium zinc vanadium sulphate was grown from an aqueous solution containing equimolar proportions of K2Zn(SO4)2·6H2O (Tutton’s salt) and VOSO4 by slow evaporation at room temperature. Single Crystal XRD analysis reveals that it belongs to monoclinic system with P21/c space group, and cell parameters are a = 9.006, b = 12.163, c = 1.36, and V = 649.6 A3. The co-existence of VO(II)- and Zn in the Tutton’s salt Crystalline matrix was confirmed by atomic absorption spectroscopy and energy dispersive X-ray spectroscopy. Scanning electron microscopy exhibits defect centres and Crystal voids. The XRD and FT-IR analyses indicate the stress that the Mixed Crystal undergoes as a result of incorporation of vanadium. Thermal patterns of Tutton’s salt and the Mixed Crystal are compared. DTA curve exhibited a sharp endothermic peak at 420 °C for the pure K2Zn(SO)4·6H2O and at 410 °C for the Mixed Crystal.
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Thermal and FTIR spectral studies in various proportions of urea thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: G. Madhurambal, M. Mariappan, Balasubramani Ravindran, S. C. MojumdarAbstract:Mixed Crystals of various proportions of urea thiourea were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized using thermogravimetry–differential thermal analysis (TG–DTA) and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two-stage mass loss between 175 and 750 °C. In this temperature range, DTA curves show exothermic peaks supporting the formulated decomposition pattern. The FTIR spectra show the characteristic absorption, vibration frequencies due to urea thiourea. Detailed structural analysis of the compound is under progress.
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TG–DTA, UV and FTIR spectroscopic studies of urea–thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: G. Madhurambal, M. Mariappan, S. C. MojumdarAbstract:Abstract A Mixed Crystal of urea–thiourea was grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized by thermogravimetric–differential thermal analysis (TG–DTA), UV and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two stage weight loss between 200 and 750 °C. In this temperature range DTA curve shows exothermic peaks supporting the formulated decomposition pattern. The UV and FTIR spectra show the characteristic absorption, vibration frequencies due to urea–thiourea Mixed Crystals. Detailed structural analysis of the compound is under progress.
Minhua Jiang - One of the best experts on this subject based on the ideXlab platform.
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passive mode locking performance with a Mixed nd lu 0 5 gd 0 5 vo 4 Crystal
Optics Express, 2009Co-Authors: Huaijin Zhang, Zhengping Wang, Jiyang Wang, Dingyuan Tang, Guoqiang Xie, H Luo, Minhua JiangAbstract:Continuous-wave (cw) mode-locking of a diode-pumped Nd:Lu0.5Gd0.5VO4 Mixed Crystal laser is reported for the first time to our knowledge with a simply compact three-mirror cavity. Stable pulses as short as 5.5 ps were generated at a repetition rate of 147 MHz. At the absorbed pump power of 16 W, a mode-locked laser with average output power of 5.31 W was obtained, giving an optical conversion efficiency of 33.2%, and a slope efficiency of 46.7%.
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Passively Q-switched laser performance of c-cut Nd:Gd0.63Y0.37VO4 Crystal
Optics Communications, 2008Co-Authors: Haohai Yu, Yonggui Yu, Zhengping Wang, Huaijin Zhang, Jiyang Wang, Minhua Jiang, Xingyu ZhangAbstract:Abstract Passively Q-switched c -cut Nd:Gd 0.63 Y 0.37 VO 4 laser performance at 1.06 μm was demonstrated with Cr 4+ :YAG as saturable absorbers for the first time to our knowledge. This c -cut Mixed Crystal was found to have large energy storage capacity. The shortest pulse width, largest pulse energy, and highest peak power were obtained to be 6.6 ns, 201.7 μJ, and 30.6 kW, respectively.
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enhancement of passive q switching performance with Mixed nd lu x gd 1 x vo 4 laser Crystals
Optics Letters, 2007Co-Authors: Haohai Yu, Yonggui Yu, Zongshu Shao, Zhengping Wang, Huaijin Zhang, Jiyang Wang, Minhua JiangAbstract:Passive Q-switching operation has been demonstrated with a class of Mixed Nd:LuxGd1−xVO4 laser Crystals. With respect to that obtained with Nd:GdVO4, the passive Q-switching performance, including threshold, pulse energy, and peak power, was found to be greatly enhanced with the Mixed vanadate Crystals. The shortest pulse width of 6.2 ns, largest pulse energy of 192.5 μJ, and highest peak power of 31.1 kW were obtained at the incident pump power of 13.75 W with the Mixed Crystal for x=0.5.
G. Madhurambal - One of the best experts on this subject based on the ideXlab platform.
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Thermal and FTIR spectral studies in various proportions of urea thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: G. Madhurambal, M. Mariappan, Balasubramani Ravindran, S. C. MojumdarAbstract:Mixed Crystals of various proportions of urea thiourea were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized using thermogravimetry–differential thermal analysis (TG–DTA) and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two-stage mass loss between 175 and 750 °C. In this temperature range, DTA curves show exothermic peaks supporting the formulated decomposition pattern. The FTIR spectra show the characteristic absorption, vibration frequencies due to urea thiourea. Detailed structural analysis of the compound is under progress.
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TG–DTA, UV and FTIR spectroscopic studies of urea–thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: G. Madhurambal, M. Mariappan, S. C. MojumdarAbstract:Abstract A Mixed Crystal of urea–thiourea was grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized by thermogravimetric–differential thermal analysis (TG–DTA), UV and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two stage weight loss between 200 and 750 °C. In this temperature range DTA curve shows exothermic peaks supporting the formulated decomposition pattern. The UV and FTIR spectra show the characteristic absorption, vibration frequencies due to urea–thiourea Mixed Crystals. Detailed structural analysis of the compound is under progress.
Huaijin Zhang - One of the best experts on this subject based on the ideXlab platform.
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passive mode locking performance with a Mixed nd lu 0 5 gd 0 5 vo 4 Crystal
Optics Express, 2009Co-Authors: Huaijin Zhang, Zhengping Wang, Jiyang Wang, Dingyuan Tang, Guoqiang Xie, H Luo, Minhua JiangAbstract:Continuous-wave (cw) mode-locking of a diode-pumped Nd:Lu0.5Gd0.5VO4 Mixed Crystal laser is reported for the first time to our knowledge with a simply compact three-mirror cavity. Stable pulses as short as 5.5 ps were generated at a repetition rate of 147 MHz. At the absorbed pump power of 16 W, a mode-locked laser with average output power of 5.31 W was obtained, giving an optical conversion efficiency of 33.2%, and a slope efficiency of 46.7%.
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Passively Q-switched laser performance of c-cut Nd:Gd0.63Y0.37VO4 Crystal
Optics Communications, 2008Co-Authors: Haohai Yu, Yonggui Yu, Zhengping Wang, Huaijin Zhang, Jiyang Wang, Minhua Jiang, Xingyu ZhangAbstract:Abstract Passively Q-switched c -cut Nd:Gd 0.63 Y 0.37 VO 4 laser performance at 1.06 μm was demonstrated with Cr 4+ :YAG as saturable absorbers for the first time to our knowledge. This c -cut Mixed Crystal was found to have large energy storage capacity. The shortest pulse width, largest pulse energy, and highest peak power were obtained to be 6.6 ns, 201.7 μJ, and 30.6 kW, respectively.
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enhancement of passive q switching performance with Mixed nd lu x gd 1 x vo 4 laser Crystals
Optics Letters, 2007Co-Authors: Haohai Yu, Yonggui Yu, Zongshu Shao, Zhengping Wang, Huaijin Zhang, Jiyang Wang, Minhua JiangAbstract:Passive Q-switching operation has been demonstrated with a class of Mixed Nd:LuxGd1−xVO4 laser Crystals. With respect to that obtained with Nd:GdVO4, the passive Q-switching performance, including threshold, pulse energy, and peak power, was found to be greatly enhanced with the Mixed vanadate Crystals. The shortest pulse width of 6.2 ns, largest pulse energy of 192.5 μJ, and highest peak power of 31.1 kW were obtained at the incident pump power of 13.75 W with the Mixed Crystal for x=0.5.
M. Mariappan - One of the best experts on this subject based on the ideXlab platform.
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Thermal and FTIR spectral studies in various proportions of urea thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: G. Madhurambal, M. Mariappan, Balasubramani Ravindran, S. C. MojumdarAbstract:Mixed Crystals of various proportions of urea thiourea were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized using thermogravimetry–differential thermal analysis (TG–DTA) and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two-stage mass loss between 175 and 750 °C. In this temperature range, DTA curves show exothermic peaks supporting the formulated decomposition pattern. The FTIR spectra show the characteristic absorption, vibration frequencies due to urea thiourea. Detailed structural analysis of the compound is under progress.
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TG–DTA, UV and FTIR spectroscopic studies of urea–thiourea Mixed Crystal
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: G. Madhurambal, M. Mariappan, S. C. MojumdarAbstract:Abstract A Mixed Crystal of urea–thiourea was grown by slow evaporation of aqueous solution at room temperature. The bright and transparent Crystals obtained were characterized by thermogravimetric–differential thermal analysis (TG–DTA), UV and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two stage weight loss between 200 and 750 °C. In this temperature range DTA curve shows exothermic peaks supporting the formulated decomposition pattern. The UV and FTIR spectra show the characteristic absorption, vibration frequencies due to urea–thiourea Mixed Crystals. Detailed structural analysis of the compound is under progress.
