Ab initio determination of total-energy surfaces for distortions of ferroelectric perovskite oxides

Takatoshi Hashimoto, Takeshi Nishimatsu, Hiroshi Mizuseki, Yoshiyuki Kawazoe, Atsushi Sasaki, Yoshiaki Ikeda

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10 Citations (Scopus)

Abstract

We established a new ab initio structure optimization technique of determining the valley line on a total-energy surface accurately for the zone-center distortions of ferroelectric perovskite oxides, and applied this technique to the analysis of barium titanate (BaTiO3), lead titanate (PbTiO3), and lead zirconate (PbZrO3). The proposed technique is an improvement over King-Smith and Vanderbilt's scheme [Phys. Rev. B 49 (1994) 5828] of evaluating total energy as a function of the amplitude of atomic displacements. The results of numerical calculations show that total energy can be expressed as a fourth-order function of the amplitude of atomic displacements in BaTiO3 but not in PbTiO3 and PbZrO 3. These results will provide some hints about the reason Pb(Zr xTi1-x)O3(PZT) has a large piezoelectric response. These results are due to the fact that our structure optimization technique automatically takes account of the higher-order coupling between atomic displacements and strains, and not only the atomic displacements of the ΓO15 soft mode but also that of the hard modes.

Original languageEnglish
Pages (from-to)6785-6792
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number9 B
DOIs
Publication statusPublished - 2004 Sep

Keywords

  • First-principles calculation
  • Lagrange multiplier
  • Lead-free
  • Potential surface
  • Valley line

ASJC Scopus subject areas

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

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