Evolution of the chemical bonding nature of ferroelectric bismuth titanate upon cation substitution

Su Gil Hur, Dae Hoon Park, Tae Woo Kim, Seong Ju Hwang

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The effect of cation substitution on the crystal and electronic structures of ferroelectric bismuth titanate has been systematically investigated. According to the x-ray diffraction analyses on Bi3.25A 0.75Ti3O12 (A = Bi, La, Gd, and Y), it was found that the cation substitution gives rise to the contraction of the volume of the unit cell and to the decrease of the structural distortion of the bismuth titanate, as well. The present x-ray absorption spectroscopic results reveal that the local structural change upon chemical reduction is remarkably depressed by the cation substitution through the enhancement of (Ti - O) bonds. Such a stabilization of TiO6 octahedra can be understood by a competition between adjacent (Bi - O) and (Ti - O) bonds as well as the contraction of the unit cell.

Original languageEnglish
Pages (from-to)4130-4132
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number18
DOIs
Publication statusPublished - 2004 Nov 1

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bismuth
substitutes
cations
contraction
cells
x ray absorption
x ray diffraction
stabilization
electronic structure
crystal structure
augmentation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Evolution of the chemical bonding nature of ferroelectric bismuth titanate upon cation substitution. / Hur, Su Gil; Park, Dae Hoon; Kim, Tae Woo; Hwang, Seong Ju.

In: Applied Physics Letters, Vol. 85, No. 18, 01.11.2004, p. 4130-4132.

Research output: Contribution to journalArticle

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AB - The effect of cation substitution on the crystal and electronic structures of ferroelectric bismuth titanate has been systematically investigated. According to the x-ray diffraction analyses on Bi3.25A 0.75Ti3O12 (A = Bi, La, Gd, and Y), it was found that the cation substitution gives rise to the contraction of the volume of the unit cell and to the decrease of the structural distortion of the bismuth titanate, as well. The present x-ray absorption spectroscopic results reveal that the local structural change upon chemical reduction is remarkably depressed by the cation substitution through the enhancement of (Ti - O) bonds. Such a stabilization of TiO6 octahedra can be understood by a competition between adjacent (Bi - O) and (Ti - O) bonds as well as the contraction of the unit cell.

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