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By means of X-ray diffraction and adiabatic scanning calorimeter,the specific heatsof five compounds in the Sm_2O_3-BaO--CuO system,such as Sm_2BaO_4,Sm_2CuO_4,BaCuO_4,Sm_2BaCuO_5,SmBa_2Cu_3O_(7-x),from -150℃ to 800℃ have been measured.It is found that the specific heats ofthese compounds increase smoothly with the increase of temperature. 相似文献
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Using the CALPHAD (Calculation of Phase Diagram) technique, the DyCl3-MCl (M = Na, K, Rb, Cs) systems were optimized and calculated. The modified quasi-chemical model in the pair approximation for short-range ordering was used to describe the Gibbs energies of the liquid phase in these systems. From the measured phase diagram data and experimental thermodynamic properties, a series of thermodynamic functions were optimized base on an interactive computer-assisted analysis. The optimized parameters and the experimental data were thermodynamically self-consistent. The optimized results were discussed. 相似文献
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优化评估了RECl_3-CaCl_2(RE:La、Ce、Pr和Nd),RECl_3-MgCl_2和CaCl_2-MgCl_2九个侧边二元系相图和热力学性质,运用Hillert不对称模型,以MgCl_2为不对称组元计算了RECl_3-CaCl_2-MgCl_2系列三元系相图,并简要讨论了不对称组元的选取原则。 相似文献
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层状Ni-Mn基锂离子电池正极材料进展 总被引:1,自引:1,他引:1
层状Ni—Mn基锂离子电池正极材料具有层状结构镍酸锂(LiNiO2)的高比容量以及尖晶石型结构锰酸锂(LiMn2O4)的高安全性、低价格等特点,是最有可能代替或部分代替LiCoO2的新型正极材料用于小型锂离子电池,同时也可望用作低成本、高安全性和大容量动力型锂离子电池的正极材料。本文综述了层状Li—Ni—Mn—O系化合物和LiNi1/3Mn1/3Co1/3O2的合成工艺、结构特点和电化学性能,阐述了层状Ni—Mn基锂离子电池正极材料的发展、研究开发现状和应用前景。 相似文献
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The Gibbs energies of liquid phases in the LaI3-MI (M=Na, K, Cs) systems were described by the modified quasi-chemical model. From the measured phase equilibrium data of these binary systems, a set of thermodynamic functions were optimized by using the CAL-PHAD technique. The enthalpy of mixing and the interaction parameter of the liquid phase were predicted from known data for the LaI3-MI systems. 相似文献
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Based on the thermodynamically self-consistent analysis and optimization of three sub-binary systems ofthe ternary system PrCl_3-CaCl_2-MgCl_2,the thermodynamics of this ternary system has been studied.UsingHillert model and taking MgCl_2 as an asymmetric component,the PrCl_3-CaCl_2-MgCl_2 phase diagram hasbeen calculated.The agreement between calculated and measured compositions and temperatures at deflectingpoints on liquidus is good.The system is a simple eutectic one with a eutectic point at 26.0mol% PrCl_3,41.5mol% CaCl_2,32.5mol% MgCl_2;560℃(calculated)and 26.0mol% PrCl_3,39.4mol% CaCl_2,34.6mol%MgCl_2;546℃(measured),respectively. 相似文献
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A semi-empirical calculation of the heat of formation was applied to ternary system:La-Fe-Al,Fe-Ni-V and Cu-Pd-Si.The calculated values were compared with the experimental ones andthe coincidence was satisfactory.This method is helpful to predict the stabilities of ternary compounds andsolid solubility. 相似文献
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在850—1050℃含有Ta或Nb离子的氟化物熔盐中,用电化学表面合金化的方法制备了Ta-Ni和Nb-Ni二元合金,分析表明合金层的成分是均匀的TaNi_3和NbNi_3化合物.利用恒电流间隙滴定技术(Galvanostatic Intermittent Titration Technique)证实了Ta-Ni二元系存在Ta_2Ni,TaNi,TaNi_2和TaNi_3四种化合物,测定了其生成电位和自由能;Nb-Ni二元系仅生成、NbNi和NbNi_3二种化合物.在熔盐电化学表面合金化的过程中,表面合金层的厚度与时间呈抛物线关系.测定了Ta-Ni和Nb-Ni合金中Ta和Nb的扩散系数,并建立了扩散系数随温度变化的Arrhenius方程 相似文献
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本文简要阐明了相图计算的原理和主要数值计算方法。相图计算的关键之一是确定体系中各相的过剩摩尔自由能,因而侧重评述了预示熔盐溶液相的过剩摩尔自由能的理论模型和几何方法及其进展。指出了计算的意义和局限性,阐明了理论计算相图与实验测定相结合是构筑熔盐相图的最佳方法。 相似文献