Born effective charges of barium titanate: Band-by-band decomposition and sensitivity to structural features

Ph Ghosez, X. Gonze, Ph Lambin, J. P. Michenaud

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)

Abstract

The Born effective charge tensors of barium titanate have been calculated for each of its four phases. Large effective charges of Ti and O, also predicted by shell-model calculations and made plausible by a simplified model, reflect the partly covalent character of the chemical bond. A band-by-band decomposition confirms that orbital hybridization is not restricted to Ti and O atoms but also involves Ba, which appears more covalent than generally assumed. Our calculations reveal a strong dependence of the effective charges on the atomic positions contrasting with a relative insensitivity on isotropic volume changes.

Original languageEnglish
Pages (from-to)6765-6768
Number of pages4
JournalPhysical Review B
Volume51
Issue number10
DOIs
Publication statusPublished - 1995
Externally publishedYes

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