Thermodynamic assessment of the ZrO2-LaO1.5 system

Yong Du, Masatomo Yashima, Toshiaki Koura, Masato Kakihana, Masahiro Yoshimura

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)


Two optimal sets of thermodynamic functions for the ZrO2-LaO1.5 system are obtained by coupling the CALPHAD (CALculation of PHAse Diagrams) technique, the regularity between thermodynamic properties and crystal structure parameters within the family of rare earth oxides, and the Van't Hoff equation. The phases are modelled with the substitutional solution model (liquid, cubic, tetragonal, monoclinic, and hexagonal solid solutions), as the stoichiometric compounds (Zr19La42O101, Zr2La2O7), and with the sublattice model (Zr2La2O7). Two optimizations are performed. In the first optimization, the Zr2La2O7 phase is treated as a stoichiometric compound, while in the second one it is described by the Wagner-Schottky model. The eutectoid reaction, high-temperature hexagonal LaO1.5 solid solution low-temperature hexagonal LaO1.5 solid solution + Zr2La2O7, is predicted from the calculation. The calculated phase diagrams and thermodynamic quantities agree well with the experimental data.

頁(從 - 到)503-511
期刊Journal of the European Ceramic Society
出版狀態Published - 1995

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 材料化學


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