Spray‐dry synthesis of β ‐Cu 1.8 Zn 0.2 V 2 O 7 ceramic fine particles showing giant negative thermal expansion

Abstract We used spray‐dry method to synthesize fine powder of β ‐Cu 1.8 Zn 0.2 V 2 O 7 showing large negative thermal expansion (NTE) linearly to temperature over a wide temperature range. The NTE of β ‐Cu 1.8 Zn 0.2 V 2 O 7 is produced by microstructures consisting of voids and anisotropic thermal...

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Published inJournal of the American Ceramic Society Vol. 103; no. 4; pp. 2757 - 2763
Main Authors Takenaka, Koshi, Sato, Miku, Mitamura, Masaya, Yokoyama, Yasunori, Katayama, Naoyuki, Okamoto, Yoshihiko
Format Journal Article
LanguageEnglish
Published 01.04.2020
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Summary:Abstract We used spray‐dry method to synthesize fine powder of β ‐Cu 1.8 Zn 0.2 V 2 O 7 showing large negative thermal expansion (NTE) linearly to temperature over a wide temperature range. The NTE of β ‐Cu 1.8 Zn 0.2 V 2 O 7 is produced by microstructures consisting of voids and anisotropic thermal deformation of crystal grains in ceramics. By reducing the size of the microstructures that produce NTE, large NTE equivalent to that of bulk was realized, even for ceramic particles of about 2 μm size. Comparison with particles produced using a conventional method demonstrates that the particle size distribution is narrow and that the particles are nearly spherical. This achievement is expected to pave the way to use of NTE materials in micrometer‐scale control of thermal expansion.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16931