Direct experimental evidence of hybridization of Pb states with O 2p states in ferroelectric perovskite oxides

J. C. Jan, H. M. Tsai, C. W. Pao, J. W. Chiou, K. Asokan, K. P.Krishna Kumar, W. F. Pong, Y. H. Tang, M. H. Tsai, S. Y. Kuo, W. F. Hsieh

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Abstract

This work presents the O K - and Ti L3,2 -edge x-ray absorption near-edge structure (XANES) spectra of Pbx Sr1-x Ti O3 (Px STO) and Bax Sr1-x Ti O3 (Bx STO) compounds with various Pb and Ba concentrations. The result provides direct evidence that the Pb-O bonding strongly affects O 2p-Ti 3d hybridization in the Ti O6 octahedron of Px STO. In contrast, the Ba-O bonding does not substantially affect O 2p-Ti 3d hybridization in Bx STO. The Ti L3 -edge XANES spectra show the splitting of the eg band for Px STO with x≳0.5, which provides an evidence of Pb-induced tetragonal distortion in the Ti O6 octahedron. In contrast, eg band splitting is absent in Bx STO.

Original languageEnglish
Article number012103
JournalApplied Physics Letters
Volume87
Issue number1
DOIs
StatePublished - 4 Jul 2005

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