Thermochemistry of the ZrO2–SrO System: From enthalpies of formation and heat capacities of the compounds to the phase diagram

Weiping Gong, Yun Xie, Zhentin Zhao, Yajie Li, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

Abstract

The thermodynamics of the ZrO2–SrO system is of interest for the optimization of synthesis and applications of functional materials and high-temperature structural ceramics. Earlier data on phase relationships and thermodynamic properties of the system are unfortunately scattered and inconsistent. In this study, the compounds Srn+1ZrnO3n+1 (n = 3, 2, and 1) were prepared by solid-state reaction. Their heat capacities from 573 to 1273 K were measured by differential scanning calorimetry and their enthalpies of formation from component oxides at 298 K were determined by high-temperature oxide melt solution calorimetry. The CALPHAD method was used to assess the ZrO2–SrO system, using both available literature data and our new measurements. A self-consistent thermodynamic database and the calculated phase diagram of the ZrO2–SrO system are provided. This work is a prerequisite for accurate predictions of the relationships among the composition, temperature, and microstructure of complex functional and structural materials containing ZrO2 and SrO.

Original languageEnglish (US)
Pages (from-to)1425-1435
Number of pages11
JournalJournal of the American Ceramic Society
Volume103
Issue number2
DOIs
StatePublished - Feb 1 2020

Keywords

  • CALPHAD
  • Ruddlesden-Popper compounds
  • ZrO–SrO
  • calorimetry
  • thermodynamics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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