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Phase diagram estimation of the Al2O3-SiO2-Re2O3 systems

  • Metallurgy And Materials
  • Published:
Journal of Shanghai University (English Edition)

Abstract

Nine limiting binaries of Al2O3-SiO2-Re2O3(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 Al2O3-SiO2-Nd2O3, Al2O3-SiO2-Sm2O3, Al2O3-SiO2-Gd2O3, and Al2O3-SiO2-La2O3. In the Al2O3-SiO2-Gd2O3 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.

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Abbreviations

G φ :

Gibbs free energy of φ Phase

°G φ i :

Gibbs free energy of pure component i of φ phase

X i :

mole fraction of component i

E G φ :

excess free energy of φ phase

k j :

j-th order parameter of Redlich-Kister polynomial

ΔGf(i) :

fusion free energy of component i

ΔHf(i) :

fusion enthalpy of component i

ΔSf(i) :

fusion entropy of component i

°G si :

Gibbs free energy of pure component i of solid phase

°G l-Al 2O3 :

Gibbs free energy of pure A12O3 of liquid phase

°G s-Al 2O3 :

Gibbs free energy of pure AI2O3 of solid phase

G(La2Oe)0.333(SiO2)0.6667:

Gibbs free energy of stoichiometric phase (La2O3)0.333(SiO2)0.6667

k31-(Sm2O3)(Al2O3):

3th order solution parameter of Redlich-Kister polynomial in Sm2O3 and Al2O3 binary

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Authors and Affiliations

  1. School of Material Science and Engineering, Shanghai University, 200072, Shanghai, China

    Li Lin & Tang Zhu-jun

  2. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, 200050, Shanghai, China

    Sun Wei-ying & Wang Pei-ling

Authors
  1. Li Lin
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  2. Tang Zhu-jun
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  3. Sun Wei-ying
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  4. Wang Pei-ling
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Supported by State Key Lab of High Performance Ceramics and Superfine Micro-structure (9517 and 9708)

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Li, L., Tang, Zj., Sun, Wy. et al. Phase diagram estimation of the Al2O3-SiO2-Re2O3 systems. J. of Shanghai Univ. 4, 72–80 (2000). https://doi.org/10.1007/s11741-000-0036-7

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  • DOI: https://doi.org/10.1007/s11741-000-0036-7

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