Distinctive charge density distributions of perovskite-type antiferroelectric oxides PbZrO3 and PbHfO3 in cubic phase

Yoshihiro Kuroiwa, Hiroshi Fujiwara, Akikatsu Sawada, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Masaki Takata, Hitoshi Kawaji, Tooru Atake

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The electron charge density distributions of simple perovskite oxides, PbBO3 (B = Ti, Zr and Hf), in their cubic phase are investigated by analyzing high-energy synchrotron powder diffraction data by the maximum entropy method (MEM)/Rietveld method. Clear structural differences between the antiferroelectric and ferroelectric perovskites are revealed. In the cubic phase of PbZrO3 and PbHfO3 that undergo antiferroelectric phase transitions, the Pb atom is disordered around the special Wyckoff position. The thermal motion of the O atom is anisotropic, and the charge density distributions around the O atom are extended in the directions perpendicular to the Zr(Hf)-O3 covalent bond. None of these structural characteristics are observed in the cubic phase of PbTiO3 that undergoes ferroelectric phase transition. The distinctive structural features observed in PbZrO3 and PbHfO3 should provide a clue to the mechanism of antiferroelectric phase transition.

Original languageEnglish
Pages (from-to)6799-6802
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number9 B
DOIs
Publication statusPublished - 2004 Sep 1
Externally publishedYes

Keywords

  • Antiferroelectric
  • Charge density
  • Order-disorder
  • PbHfO
  • PbTiO
  • PbZrO
  • Perovskite
  • Powder diffraction
  • Structure analysis
  • Synchrotron radiation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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