Colossal Negative Thermal Expansion in Electron-Doped PbVO3 Perovskites

Angewandte Chemie
Hajime YamamotoMasaki Azuma

Abstract

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-x Bix VO3 (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. Pb0.76 La0.04 Bi0.20 VO3 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 Pb0.76 La0.04 Bi0.20 VO3 polycrystalline sample. The pronounced NTE in the sintered body should be attributed to an anisotropic lattice parameter change.

References

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Citations

Sep 7, 2018·Frontiers in Chemistry·J Paul Attfield
Mar 9, 2021·Inorganic Chemistry·Alexei A Belik
Jul 15, 2021·Chemical Communications : Chem Comm·Lisa M van WykLeonard J Barbour
Feb 7, 2019·Inorganic Chemistry·Hajime YamamotoMasaki Azuma
Nov 13, 2019·Inorganic Chemistry·Hayato IshizakiMasaki Azuma
Nov 19, 2019·Journal of the American Chemical Society·Takumi NishikuboMasaki Azuma

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