Low-Temperature Synthesis of CaZrO3 Powder from Molten Salts

Authors

  • Zushu Li,

    1. Department of Materials, Imperial College London, London SW7 2AZ, UK
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  • William Edward Lee,

    1. Department of Materials, Imperial College London, London SW7 2AZ, UK
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    • *Fellow, American Ceramic Society.

  • Shaowei Zhang

    Corresponding author
    1. Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK
      †Author to whom correspondence should be addressed. e-mail: s.zhang@sheffield.ac.uk
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    • **Member, American Ceramic Society.

    • Hubei Province Key Lab of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.


  • J. W. Halloran—contributing editor

  • This work was financially supported by Engineering and Physical Sciences Research Council (EPSRC), UK (grant numbers GR/S60037/01 and GR/S99211/01).

†Author to whom correspondence should be addressed. e-mail: s.zhang@sheffield.ac.uk

Abstract

Calcium zirconate (CaZrO3) powder was synthesized using calcium chloride (CaCl2), sodium carbonate (Na2CO3), and zirconia (ZrO2) powders. On heating, CaCl2 reacted with Na2CO3 to form NaCl and CaCO3. NaCl–Na2CO3 molten salts provided a liquid reaction medium for the formation of CaZrO3 from in situ-formed CaCO3 (or CaO) and ZrO2. CaZrO3 started to form at about 700°C, increasing in amount with increasing temperature and reaction time, with a concomitant decrease in CaCO3 (or CaO) and ZrO2 contents. After washing with hot-distilled water, the samples heated for 5 h at 1050°C were single-phase CaZrO3 with 0.5–1.0 μm grain size.

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