Establishment of the equilibrium phase diagrams in fluorite-related systems, ZrO2-CeO2 and SrF2-LaF3, by hydrothermal techniques

Masahiro Yoshimura, Kwang Jin Kim, Eiji Tani, Shigeyuki Somiya

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Abstract

The equilibrium solidus phase diagrams in fluorite-related systems of ZrO2-CeO2 and SrF2-LaF3 are established by hydrothermal techniques in aqueous LiCl solution at below 1400°C and 750°C, respectively. The solid solutions of cubic, tetragonal and monoclinic phase are produced in the system ZrO2-CeO2. The tetragonal phase decomposes to monoclinic and cubic phase at the eutectoid temperature of 1050°C±50°C. The coexistent boundary of the tetragonal and cubic phase are about 18 and 70 mol% CeO2, 16 and 80 mol% CeO2, at 1400°C and 1200°C, respectively. The coexistent boundary of the monoclinic and cubic phase are about 1.5 and 88 mol% CeO2, 1.5 and 98 mol% CeO2, at 1000°C and 800°C, respectively. The solid solutions of cubic and hexagonal phases are produced in the system SrF2-LaF3. The coexistent boundaries of the cubic and hexagonal phases are about 47 and 94 mol% LaF2, 47 and 96 mol% LaF3, and 46 and 98 mol% LaF3 at 750°C, 650°C and 500°C, respectively.

Original languageEnglish
Pages (from-to)452-457
Number of pages6
JournalSolid State Ionics
Volume28-30
Issue numberPART 1
DOIs
Publication statusPublished - 1988 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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