Experimental study and thermodynamic calculation of Lu2O3-SiO2 binary system

As a binary system of BaO-Lu_2O_3-SiO_2 ternary system, Lu_2O_3-SiO_2 system was optimized and calculated by CALPHAD approach based on available phase diagram and relevant thermodynamic data of RE_2O_3-SiO_2（RE=Lu,Yb,Y） binary systems as well as our experimental data of Lu_2O_3-SiO_2 system obtained...

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Bibliographic Details
Published inJournal of rare earths Vol. 35; no. 9; pp. 927 - 933
Main Author 叶信宇 罗洋 刘松彬 吴迪 侯得健 杨凤丽
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2017
Subjects
CALPHAD
ionic two-sublattice model
Lu2O3-SiO2
phase diagram
rare earths
thermodynamics
三元系统
二进制
吉布斯自由能
实验数据
格点模型
淬火系统
热力计算
高温超导
thermodynamics
CALPHAD
phase diagram
Lu2O3-SiO2
ionic two-sublattice model
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(17)60996-7

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Summary:As a binary system of BaO-Lu_2O_3-SiO_2 ternary system, Lu_2O_3-SiO_2 system was optimized and calculated by CALPHAD approach based on available phase diagram and relevant thermodynamic data of RE_2O_3-SiO_2（RE=Lu,Yb,Y） binary systems as well as our experimental data of Lu_2O_3-SiO_2 system obtained by quenching experiment. The Gibbs free energy of high temperature solution was described by an ionic two-sublattice model as（Lu~（3＋））P（O~（2-）, SiO_2~0）Q. The calculated phase diagram below 1873 K was in good agreement with experimental data at 1573, 1773 and 1873 K. The calculated Gibbs energies of two intermediate phases Lu_2SiO_5 and Lu_2Si_2O_7, the activity of Lu_2O_3 and SiO_2 and specific heat capacities of intermediate phases agreed well with experimental results of Y_2O_3-SiO_2 system. This tentative study will offer help for the research of single-phase phosphor and related metallurgical slags, refractories, high-temperature superconductivity material systems.
Bibliography:11-2788/TF
phase diagram Lu_2O_3-SiO_2 thermodynamics ionic two-sublattice model CALPHAD rare earths
As a binary system of BaO-Lu_2O_3-SiO_2 ternary system, Lu_2O_3-SiO_2 system was optimized and calculated by CALPHAD approach based on available phase diagram and relevant thermodynamic data of RE_2O_3-SiO_2（RE=Lu,Yb,Y） binary systems as well as our experimental data of Lu_2O_3-SiO_2 system obtained by quenching experiment. The Gibbs free energy of high temperature solution was described by an ionic two-sublattice model as（Lu~（3＋））P（O~（2-）, SiO_2~0）Q. The calculated phase diagram below 1873 K was in good agreement with experimental data at 1573, 1773 and 1873 K. The calculated Gibbs energies of two intermediate phases Lu_2SiO_5 and Lu_2Si_2O_7, the activity of Lu_2O_3 and SiO_2 and specific heat capacities of intermediate phases agreed well with experimental results of Y_2O_3-SiO_2 system. This tentative study will offer help for the research of single-phase phosphor and related metallurgical slags, refractories, high-temperature superconductivity material systems.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60996-7