Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 27, Pages 8170-8173Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804082
Keywords
doping; Jahn-Teller distortion; perovskite phases; phase transitions; vanadates
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Funding
- Japan Society for the Promotion of Science (JSPS) [16H02393]
- Kanagawa Institute of Industrial Science and Technology
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Colossal negative thermal expansion (NTE) with a volume contraction of about 8%, the largest value reported so far for NTE materials, was observed in an electron-doped giant tetragonal perovskite compound Pb1-xBixVO3 (x=0.2 and 0.3). A polar tetragonal (P4mm) to non-polar cubic structural transition took place upon heating. The coefficient of thermal expansion (CTE) and the working temperature could be tuned by changing the Bi content, and La substitution decreased the transition temperature to room temperature. Pb0.76La0.04Bi0.20VO3 exhibited a unit cell volume contraction of 6.7% from 200 K to 420 K. Interestingly, further gigantic NTE of about 8.5% was observed in a dilametric measurement of a Pb0.76La0.04Bi0.20VO3 polycrystalline sample. The pronounced NTE in the sintered body should be attributed to an anisotropic lattice parameter change.
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