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Phase Diagram Estimation of the Al_2O_3-SiO_2-Re_2O_3 Systems
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作者 Lin Li Zhu-jun Tang +1 位作者 Wei-ying Sun Pei-ling Wang 《Advances in Manufacturing》 2000年第1期72-80,共9页
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 ... 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. 展开更多
关键词 limiting binary assessment ternary system isothermal section liquidus surface
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Phase equilibria in low basicity region of CaO-SiO2-Nb2O5-(5 wt%,10 wt%,15 wt%) La2O3 system
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作者 Jiyu Qiu Chengjun Liu +1 位作者 Zhengyue Liu Zhe Yu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第1期100-107,共8页
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) ... 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) resources.In this work,the phase equilibria in low basicity region(w(CaO)/w(SiO2)<1) of CaO-SiO2-Nb2O5-(0-15 wt%)La2O3 system at 1373-1873 K were experimentally studied by thermodynamic equilibrium experiment,and then,the results were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy dispersive spectrometry(EDS).Additionally,an optimized method was proposed to process the compositions of equilibrium liquid phases at different temperatures.According to the experimental results,the univariate line between CaNb2O6,SiO2 and LaNbO4 primary phase fields,interface between CaNb2O6 and SiO2 primary phase fields and isothermal liquidus surfaces in SiO2 primary phase field were determined.Finally,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. 展开更多
关键词 Phase equilibria CaO-SiO2-Nb2O5-La2O3 liquidus surface Primary phase field Rare earths
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