Stable and Metastable Phase Relations in the System ZrO2‐CaO

JOHN R. HELLMANN, VLADIMIR S. STUBICAN

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Abstract

The chemical equilibrium for the system ZrO2‐CaO was rede termined for temperatures above ∼1000°C by heating reactive powders for extended periods of time. The eutectoid decom position of the cubic solid solution was found to occur at 1140°±40°C and 17.0±0.5 mol% CaO. Decomposition reac tions in sintered cubic solid solutions were studied using elec tron diffraction and transmission techniques. Decomposition follows metastable extensions of the boundary lines which sena rate two‐phase regions from the adjacent cubic solid solution region. The appearance of the diffuse diffraction features in the electron diffraction patterns of cubic solid solutions Seems to be associated with short‐range ordering of oxygen vacancies.‘Duo ordered phases, CaZr4O9 and Ca6Zr19O44, were syn thesized and their upper limits of stability were determined to be 1235°±15° and 1355°±15°C, respectively.

Original languageEnglish (US)
Pages (from-to)260-264
Number of pages5
JournalJournal of the American Ceramic Society
Volume66
Issue number4
DOIs
StatePublished - Apr 1983

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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