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Phase equilibria in low basicity region of CaO-SiO2-Nb2O5-（5 wt%,10 wt%,15 wt%） La2O3 system

Journal of Rare Earths 2020年第1期38卷 100-107页

作者： Jiyu Qiu Chengjun Liu Zhengyue Liu Zhe Yu Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

The lack of thermodynamic information,such as primary phase fields and liquidus temperatures,in the CaO-SiO2-Nb2O5-La2O3 quaternary system phase diagram has restricted the comprehensive utilization of the niobium(Nb) and rare earth(RE) *** this work,the phase equilibria in low basicity region(w(CaO)/w(SiO2)liquidus surfaces in SiO2 primary phase field were ***,the spatial phase diagram of CaO-SiO2-Nb2O5-La2O3 within specific region was constructed,and furthermore,the phase diagram was also presented in CaO-SiO2-Nb2O5 pseudo-ternary system with w(La2O3)=5 wt%,10 wt% and 15 wt%.The research results have guiding significance for the improvement of related phase diagram and the comprehensive utilization of Nb and RE resources.

关键词： Phase equilibria CaO-SiO2-Nb2O5-La2O3 liquidus surface Primary phase field Rare earths

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Phase Diagram Estimation of the Al_2O_3-SiO_2-Re_2O_3 Systems

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Advances in Manufacturing 2000年第1期4卷 72-80页

作者： Lin Li Zhu-jun Tang Wei-ying Sun Pei-ling Wang School of Material Science and Engineering Shanghai University Shanghai China State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science Shanghai China

Nine limiting binaries of Al 2O 3 SiO 2 Re 2O 3 (Re=Nd,Sm,Gd and La) system are assessed. The binary diagrams or experimental information from Toropov, Mizuno, Aramaki, Bondar, Rolin and Coutures are optimized with the substitutional model of Kaufman and Nesor and the approximate formula of fusion free energy for rare earth element oxides of Wu and Pelton. The extracted Gibbs free energies of pure solid oxides and stoichiometric phases and the solution parameters are used to estimate the corresponding binaries, liquidus surfaces and a series of isothermal sections of four ternaries Al 2O 3 SiO 2 Nd 2O 3, Al 2O 3 SiO 2 Sm 2O 3, Al 2O 3 SiO 2 Gd 2O 3, and Al 2O 3 SiO 2 La 2O 3. In the Al 2O 3 SiO 2 Gd 2O 3 system samples as fired at exact temperature with different compositions were analyzed by X ray diffractometer and the detected results are fitted with the calculation of isothermal sections.

关键词： limiting binary assessment ternary system isothermal section liquidus surface

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