Isotropic negative thermal expansion in ZrW2O8 and HfW2O8 from 1100 to 1275°C

Benjamin S. Hulbert, Dylan W. Blake, Gerard S. Mattei, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

ZrW2O8 (ZrO2•2WO3) and HfW2O8 (HfO2•2WO3) have been the focus of thermal expansion studies due to their isotropic negative thermal expansion (NTE) measured previously at temperatures below 775°C. This work presents measurements of these materials at their thermodynamically stable temperature ranges of 1105 and 1257°C for ZrW2O8 and 1105–1276°C for HfW2O8, where they were characterized with in situ, powder X-ray diffraction. The linear coefficients of thermal expansion were measured to be −5.52 × 10−6 and −4.87 × 10−6°C−1 for ZrW2O8 and HfW2O8, respectively. The mechanism leading to this NTE is discussed. Powder samples were synthesized by a solution-based process called the organic–inorganic steric entrapment method. In situ characterization in air was carried out at the National Synchrotron Light Source II using a hexapole lamp, optical furnace and the Advanced Photon Source using a quadrupole lamp, optical furnace to achieve elevated temperatures.

Original languageEnglish (US)
Pages (from-to)4594-4603
Number of pages10
JournalJournal of the American Ceramic Society
Volume107
Issue number7
DOIs
StateAccepted/In press - 2024

Keywords

  • equilibrium
  • HfWO
  • high temperature
  • in situ
  • isotropic
  • negative thermal expansion
  • synchrotron radiation
  • ZrWO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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