Colossal Negative Thermal Expansion in Electron-Doped PbVO3 Perovskites

Hajime Yamamoto, Takashi Imai, Yuki Sakai, Masaki Azuma

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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−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.

Original languageEnglish
Pages (from-to)8170-8173
Number of pages4
JournalAngewandte Chemie - International Edition
Volume57
Issue number27
DOIs
Publication statusPublished - 2018 Jul 2

Keywords

  • Jahn–Teller distortion
  • doping
  • perovskite phases
  • phase transitions
  • vanadates

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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