Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Regular Issue: Full papers
Negative thermal expansion in PbTiO3-type perovskites oxide Bi0.5+xNa0.5−xVO3
Takehiro KoikeTakumi NishikuboYuki SakaiHirofumi IshiiMasaki Azuma
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2022 年 130 巻 8 号 p. 691-695

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Negative thermal expansion (NTE) in Bi0.5+xNa0.5−xVO3 is investigated. The parent compound, Bi0.5Na0.5VO3, is a lead-free polar perovskite oxide with a tetragonal distortion comparable to that of ferroelectric PbTiO3 owing to the ordering of dxy orbital of V4+ with d1 electronic configuration. The c/a ratio was decreased by electron doping to V4+ through increasing Bi3+/Na+ ratio and transition to a non-polar cubic phase on heating accompanied by NTE with a large volume shrinkage of −2.28 % was enabled. It is found that the Bi0.5Na0.5VO3 derivatives exhibit NTE when the c/a ratio is smaller than the critical value of ∼1.06.

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