期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 751, 期 -, 页码 241-246出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.04.094
关键词
Vanadium dioxide; Spark plasma sintering (SPS); Inhomogeneous strain; Metal-insulator transition; Heat storage
Vanadium dioxide (VO2), which undergoes a metal-insulator transition (MIT) at 67 degrees C, is an attractive material for caloric applications, possessing a latent heat comparable to that of ice-water. Here, we have investigated the variation in latent heat due to residual strain induced by spark plasma sintering (SPS). SPS pressure linearly increased the degree of inhomogeneous strain, thereby reducing the latent heat and broadening the MIT temperature range. Optical observation of MIT revealed a slow transition in highly strained samples. Moderate annealing of highly strained VO2 can eliminate this strain, and thereby recover the high latent heat. The present study indicates the importance of strain tuning for the utilization of intrinsic latent heat in VO2 ceramics. (C) 2018 Elsevier B.V. All rights reserved.
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