The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Sameer V Dalvi - One of the best experts on this subject based on the ideXlab platform.
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partial molar volume fraction of solvent in binary co2 solvent solution for Solid Solubility predictions
Journal of Supercritical Fluids, 2004Co-Authors: Mamata Mukhopadhyay, Sameer V DalviAbstract:Prediction of Solid solute Solubility in an organic solvent with dissolution of dense CO2 as antisolvent is important for the design of antisolvent crystallization processes. A new model is proposed in this work to predict the mole fraction of a pure Solid solute in a ternary (CO2–solvent–Solid) system at Solid–liquid equilibrium. This is based on the hypothesis that CO2 molecules cluster around the solvent molecules at high values of CO2 mole fraction. As a result the solvent molecules proportionately lose their affinity for the Solid solute molecules. Accordingly the Solid mole fraction in a solution is considered to be proportional to the partial molar volume fraction (PMVF) of the solvent in the binary (CO2–solvent) liquid solution or the solvent's contribution to the molar volume of the binary system. This model enables prediction of the liquid phase composition of the ternary system using only the binary information. The model has been validated, by predicting the Solid Solubility in various organic solvents, in good agreement with the corresponding experimental data from the literature, for several Solids, such as β-carotene, cholesterol, acetaminophen, as well as naphthalene, phenanthrene and salicylic acid. The performance of this model is found to be better than an earlier method, which uses the partial molar volume (PMV) of solvent in the CO2–solvent mixture.
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Partial molar volume fraction of solvent in binary (CO2–solvent) solution for Solid Solubility predictions
Journal of Supercritical Fluids, 2004Co-Authors: Mamata Mukhopadhyay, Sameer V DalviAbstract:Prediction of Solid solute Solubility in an organic solvent with dissolution of dense CO2 as antisolvent is important for the design of antisolvent crystallization processes. A new model is proposed in this work to predict the mole fraction of a pure Solid solute in a ternary (CO2–solvent–Solid) system at Solid–liquid equilibrium. This is based on the hypothesis that CO2 molecules cluster around the solvent molecules at high values of CO2 mole fraction. As a result the solvent molecules proportionately lose their affinity for the Solid solute molecules. Accordingly the Solid mole fraction in a solution is considered to be proportional to the partial molar volume fraction (PMVF) of the solvent in the binary (CO2–solvent) liquid solution or the solvent's contribution to the molar volume of the binary system. This model enables prediction of the liquid phase composition of the ternary system using only the binary information. The model has been validated, by predicting the Solid Solubility in various organic solvents, in good agreement with the corresponding experimental data from the literature, for several Solids, such as β-carotene, cholesterol, acetaminophen, as well as naphthalene, phenanthrene and salicylic acid. The performance of this model is found to be better than an earlier method, which uses the partial molar volume (PMV) of solvent in the CO2–solvent mixture.
Hong Lee Park - One of the best experts on this subject based on the ideXlab platform.
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Determination of the Solid Solubility of SrAl2o4 in CaAl2o4 through crystal field-dependent Eu2+ signatures
Materials Research Bulletin, 1999Co-Authors: S.g Kim, J.c. Choi, Hong Lee Park, Sun-il Mho, Taewhan KimAbstract:Abstract The Solid Solubility of the SrAl 2 O 4 –CaAl 2 O 4 system was investigated. Both XRD patterns and cathodoluminescence from Eu 2+ in the host lattices were utilized to investigate the Solid Solubility of SrAl 2 O 4 in CaAl 2 O 4 . A single phase exists in the range x = 1 to x = 0.5 in Sr 1−x Ca x Al 2 O 4 composition (i.e., the [CaAl 2 O 4 ] phase exists as a single phase from CaAl 2 O 4 to Sr 0.5 Ca 0.5 Al 2 O 4 ). The luminescence band maximum of Eu 2+ in [CaAl 2 O 4 ] phase shifts from 433 nm (CaAl 2 O 4 :Eu 2+ ) to 404 nm (Sr 0.9 Ca 0.1 Al 2 O 4 :Eu 2+ ). The blue-shift behavior of Eu 2+ emission can be explained in terms of Eu 2+ experiencing the weakening of crystal field strength with the decreasing x value of Sr 1−x Ca x Al 2 O 4 :Eu 2+ (0.01%). This phenomenon confirms that Blasse’s prediction regarding the Eu 2+ crystal field-dependent 4 f 6 5 d 1 energy level is applicable in oxide hosts.
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Tunable color emission in a Zn1-xCdxGa2O4 phosphor and Solid Solubility of CdGa2O4 in ZnGa2O4
Materials Research Bulletin, 1998Co-Authors: S.k. Choi, Taewhan Kim, Sun-il Mho, H. S. Moon, Hong Lee ParkAbstract:Abstract Tunable color emission was achieved through forming Solid solution between ZnGa 2 O 4 and CdGa 2 O 4 , i.e., Zn 1−x Cd x Ga 2 O 4 . The Solid Solubility limit of CdGa 2 O 4 in ZnGa 2 O 4 was found to be 0.6 mole fraction. Thus, Solid solution can exist in 0 ≤ x ≤ 0.6 compositions in the Zn 1−x Cd x Ga 2 O 4 . Emission color was tunable between 352 and 520 nm in Zn 1−x Cd x Ga 2 O 4 (0 ≤ x ≤ 0.6). Our approach has demonstrated an innovative way of tuning color through the formation of Solid solution between CdGa 2 O 4 and ZnGa 2 O 4
Mamata Mukhopadhyay - One of the best experts on this subject based on the ideXlab platform.
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partial molar volume fraction of solvent in binary co2 solvent solution for Solid Solubility predictions
Journal of Supercritical Fluids, 2004Co-Authors: Mamata Mukhopadhyay, Sameer V DalviAbstract:Prediction of Solid solute Solubility in an organic solvent with dissolution of dense CO2 as antisolvent is important for the design of antisolvent crystallization processes. A new model is proposed in this work to predict the mole fraction of a pure Solid solute in a ternary (CO2–solvent–Solid) system at Solid–liquid equilibrium. This is based on the hypothesis that CO2 molecules cluster around the solvent molecules at high values of CO2 mole fraction. As a result the solvent molecules proportionately lose their affinity for the Solid solute molecules. Accordingly the Solid mole fraction in a solution is considered to be proportional to the partial molar volume fraction (PMVF) of the solvent in the binary (CO2–solvent) liquid solution or the solvent's contribution to the molar volume of the binary system. This model enables prediction of the liquid phase composition of the ternary system using only the binary information. The model has been validated, by predicting the Solid Solubility in various organic solvents, in good agreement with the corresponding experimental data from the literature, for several Solids, such as β-carotene, cholesterol, acetaminophen, as well as naphthalene, phenanthrene and salicylic acid. The performance of this model is found to be better than an earlier method, which uses the partial molar volume (PMV) of solvent in the CO2–solvent mixture.
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Partial molar volume fraction of solvent in binary (CO2–solvent) solution for Solid Solubility predictions
Journal of Supercritical Fluids, 2004Co-Authors: Mamata Mukhopadhyay, Sameer V DalviAbstract:Prediction of Solid solute Solubility in an organic solvent with dissolution of dense CO2 as antisolvent is important for the design of antisolvent crystallization processes. A new model is proposed in this work to predict the mole fraction of a pure Solid solute in a ternary (CO2–solvent–Solid) system at Solid–liquid equilibrium. This is based on the hypothesis that CO2 molecules cluster around the solvent molecules at high values of CO2 mole fraction. As a result the solvent molecules proportionately lose their affinity for the Solid solute molecules. Accordingly the Solid mole fraction in a solution is considered to be proportional to the partial molar volume fraction (PMVF) of the solvent in the binary (CO2–solvent) liquid solution or the solvent's contribution to the molar volume of the binary system. This model enables prediction of the liquid phase composition of the ternary system using only the binary information. The model has been validated, by predicting the Solid Solubility in various organic solvents, in good agreement with the corresponding experimental data from the literature, for several Solids, such as β-carotene, cholesterol, acetaminophen, as well as naphthalene, phenanthrene and salicylic acid. The performance of this model is found to be better than an earlier method, which uses the partial molar volume (PMV) of solvent in the CO2–solvent mixture.
Tor Grande - One of the best experts on this subject based on the ideXlab platform.
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Solid Solubility of rare earth elements (Nd, Eu, Tb) in In2−xSnxO3 – effect on electrical conductivity and optical properties
Dalton transactions (Cambridge England : 2003), 2014Co-Authors: Tor Olav Løveng Sunde, Mikael Lindgren, Thomas O. Mason, Mari-ann Einarsrud, Tor GrandeAbstract:Wide band-gap semiconductors doped with luminescent rare earth elements (REEs) have attracted recent interest due to their unique optical properties. Here we report on the synthesis of the transparent conducting oxides (TCOs) indium oxide and indium tin oxide (ITO) doped with neodymium, europium and terbium. The Solid Solubility in the systems was investigated and isothermal phase diagrams at 1400 °C were proposed. The Solubility of the REEs in In2O3 is mainly determined by the size of the rare earth dopant, while in ITO the Solid Solubility was reduced due to a strong tendency of the tin and REE co-dopants to form a pyrochlore phase. The effect of the REE-doping on the conductivity of the host was determined and optical activity of the REE dopants were investigated in selected host materials. The conductivity of sintered materials of REE-doped In2O3 was significantly reduced, even at small doping concentrations, due to a decrease in carrier mobility. The same decrease in mobility was not observed in thin films of the material processed at lower temperatures. Strong emissions at around 611 nm were observed for Eu-doped In2O3, demonstrating the possibility of obtaining photoluminescence in a TCO host, while no emissions was observed for Nd- and Tb-doping.
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Solid Solubility and phase transitions in the system lanb1 xtaxo4
Journal of Solid State Chemistry, 2008Co-Authors: Fride Vullum, Fabian Nitsche, Sverre Magnus Selbach, Tor GrandeAbstract:Abstract The Solid Solubility between LaNbO4 and LaTaO4 was investigated by X-ray diffraction, and a two-phase region was observed in the composition region LaNb1−xTaxO4 where 0.4⩽x⩽0.8. Single-phase LaNb1−xTaxO4 (0⩽x⩽0.4) with the monoclinic Fergusonite structure at ambient temperature, was observed to transform to a tetragonal Scheelite structure by in-situ high-temperature X-ray diffraction, and the phase transition temperature was shown to increase with increasing Ta-content. This ferroelastic to paraelastic second-order phase transition was described by Landau theory using spontaneous strain as an order parameter. The thermal expansion of LaNb1−xTaxO4 (0⩽x0.4) was shown to be significantly higher below the phase transition than above. Single-phase LaNb1−xTaxO4 (0.8⩽x⩽1) with another monoclinic crystal structure at ambient temperature was shown to transform to an orthorhombic crystal structure by X-ray diffraction and differential scanning calorimetry. The phase transition temperature was observed to decrease with decreasing Ta-content. Finally, orthorhombic LaTaO4 could also be transformed to monoclinic LaTaO4 at ambient temperature by applying a uniaxial pressure of 150–170 MPa, reflecting the lower molar volume of monoclinic LaTaO4.
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Solid Solubility and phase transitions in the system LaNb1−xTaxo4
Journal of Solid State Chemistry, 2008Co-Authors: Fride Vullum, Fabian Nitsche, Sverre Magnus Selbach, Tor GrandeAbstract:Abstract The Solid Solubility between LaNbO4 and LaTaO4 was investigated by X-ray diffraction, and a two-phase region was observed in the composition region LaNb1−xTaxO4 where 0.4⩽x⩽0.8. Single-phase LaNb1−xTaxO4 (0⩽x⩽0.4) with the monoclinic Fergusonite structure at ambient temperature, was observed to transform to a tetragonal Scheelite structure by in-situ high-temperature X-ray diffraction, and the phase transition temperature was shown to increase with increasing Ta-content. This ferroelastic to paraelastic second-order phase transition was described by Landau theory using spontaneous strain as an order parameter. The thermal expansion of LaNb1−xTaxO4 (0⩽x0.4) was shown to be significantly higher below the phase transition than above. Single-phase LaNb1−xTaxO4 (0.8⩽x⩽1) with another monoclinic crystal structure at ambient temperature was shown to transform to an orthorhombic crystal structure by X-ray diffraction and differential scanning calorimetry. The phase transition temperature was observed to decrease with decreasing Ta-content. Finally, orthorhombic LaTaO4 could also be transformed to monoclinic LaTaO4 at ambient temperature by applying a uniaxial pressure of 150–170 MPa, reflecting the lower molar volume of monoclinic LaTaO4.
C. D. Kim - One of the best experts on this subject based on the ideXlab platform.
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Tunable color emission and Solid Solubility limit in Ba1−xCaxAl2O4:Eu0.0012+ phosphors through the mixed states of CaAl2O4 and BaAl2O4
Materials Research Bulletin, 2000Co-Authors: J.c. Choi, Hyung-sik Park, T. W. Kim, C. D. KimAbstract:Abstract The tunable color emission and Solid Solubility limit in Ba1−xCaxAl2O4:Eu0.0012+ phosphors was investigated by using cathodoluminescence (CL) and X-ray diffraction (XRD) measurements. The CL spectra showed that the tuning range of the color emission was between 500 and 430 nm. The XRD curves showed that the lattice constant of the (102) plane in the Ba0.6Ca0.4Al2O4:Eu0.0012+ phosphor had a minimum value, and that the single phase limit in the Ba1−xCaxAl2O4:Eu0.0012+ phosphors is below x value of 0.4.
