Measurement and calculation of the ZrO2-CeO2-LaO1.5phase diagram

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

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13 Citations (Scopus)

Abstract

A thermodynamic assessment of the CeO2-LaO1.5 system has been conducted and combined with recently evaluated thermodynamic parameters for the ZrO2-CeO2 and ZrO2-LaO1.5 systems to predict the ZrO2-CeO2-LaO1.5 ternary phase diagram. Based on the predicted 1400°C isothermal section, twenty-five decisive samples, which were prepared by co-precipitation method and arc melting of melts, were annealed at this temperature for 848 h. The annealed samples were analyzed by using X-ray diffraction method and precise lattice parameter measurement. It was found that the phase assemblages resulting from eighteen of the twenty-five samples can be described by the predicted isothermal section. The agreement between the measured and calculated 1400°C isothermal sections is improved by introducing ternary interaction parameters to the Gibbs energies of Css (cubic solid solution) and Tss (terminal solid solution based on tetragonal ZrO2). The same samples as above were annealed at 1550°C for 100 h, and the resultant phase assemblages were compared with the 1550°C isothermal section calculated by using the above assessed ternary parameters. The comparison shows that twenty-three o f the twenty-five samples can be reproduced by the calculation. A few isothermal and vertical sections as well as the reaction scheme are calculated for practical use. The combined use of the CALPHAD technique and experimental methods to establish multicomponent ZrO2 phase diagrams is stressed.

Original languageEnglish
Pages (from-to)95-108
Number of pages14
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume20
Issue number1
DOIs
Publication statusPublished - 1996 Mar

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Computer Science Applications

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