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Spray‐dry synthesis of β ‐Cu 1.8 Zn 0.2 V 2 O 7 ceramic fine particles showing giant negative thermal expansion
Author(s) -
Takenaka Koshi,
Sato Miku,
Mitamura Masaya,
Yokoyama Yasunori,
Katayama Naoyuki,
Okamoto Yoshihiko
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16931
Subject(s) - ceramic , materials science , negative thermal expansion , thermal expansion , microstructure , mineralogy , particle size , particle (ecology) , atmospheric temperature range , anisotropy , composite material , chemical engineering , thermodynamics , chemistry , optics , physics , oceanography , engineering , geology
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.