【摘 要】
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As a binary system of BaO-Lu2O3-SiO2 ternary system, Lu2O3-SiO2 system was optimized and calculated by CALPHAD method based on our experimental data and the phase diagram and relevant thermodynamic da
【机 构】
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School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzho
【出 处】
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第十七届全国相图学术会议暨相图与材料设计国际研讨会
论文部分内容阅读
As a binary system of BaO-Lu2O3-SiO2 ternary system, Lu2O3-SiO2 system was optimized and calculated by CALPHAD method based on our experimental data and the phase diagram and relevant thermodynamic data available from RE2O3-SiO2 (RE=Yb,Y) binary system.The Gibbs free energy of high temperature solution was described by an ionic two-sublattice model as (Lu3+)P(O2-,SiO2)2.The calculated phase diagram below 1873K is in good agreement with experimental data at 1573, 1773 and 1873K.The calculated Gibbs energy of three intermediate phases Lu2SiO5, Lu2Si2O7, Lu4Si3O12, the activity of SiO2, enthalpy of formation and specific heat capacity of intermediate phases show agreement with experimental results of RE2O3-SiO2 (RE=Yb,Y) system.This tentative study will offer help for single-phase phosphor research and related metallurgical slags, refractories, high-temperature superconductivity material systems.
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