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7019967 
Journal Article 
Negative Thermal Expansion of beta-Cu1.8Zn0.2V2O7 Ceramic Fine Particles Synthesized by a Spray-Drying Method 
Takenaka, K; Sato, M; Nishikawa, T; Omura, T; Yamada, N; Yokoyama, Y; Katayama, N; Okamoto, Y; , 
2020 
Yes 
Journal of the Japan Institute of Metals/Nippon Kinzoku Gakkaishi
ISSN: 0021-4876
EISSN: 1880-6880 
JAPAN INST METALS & MATERIALS 
SENDAI 
84 
5 
161-166 
WOS:000530022200003 
Spray-drying synthesis successfully produced ceramic fine particles of beta-Cu1.8Zn0.2V2O7, which exhibits a large negative thermal expansion (NTE) linearly to temperature over a wide temperature range. While the heating at the highest temperature was fixed at 670 degrees C for 10 nun, the heating/cooling rate was adjusted to shorten the total heating time. As a result, the volume frequency median particle size was reduced to 2.2 pm without changing the NTE properties. Compared with the conventional methods, the present method provides the benefit of obtaining fine particles of narrow particle size distribution with a shape close to a sphere. The present results are expected to pave the way to use of the NTE vanadates in thermal expansion control of micrometer-scale region. 
negative thermal expansion; spray drying; microstructural effect; fine particle