TITLE

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

AUTHOR(S)
Jan, J. C.; Tsai, H. M.; Pao, C. W.; Chiou, J. W.; Asokan, K.; Kumar, K. P. Krishna; Pong, W. F.; Tang, Y. H.; Tsai, M.-H.; Kuo, S. Y.; Hsieh, W. F.
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p012103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This work presents the O K- and Ti L3,2-edge x-ray absorption near-edge structure (XANES) spectra of PbxSr1-xTiO3 (PxSTO) and BaxSr1-xTiO3 (BxSTO) 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 TiO6 octahedron of PxSTO. In contrast, the Ba–O bonding does not substantially affect O 2p–Ti 3d hybridization in BxSTO. The Ti L3-edge XANES spectra show the splitting of the eg band for PxSTO with x>=0.5, which provides an evidence of Pb-induced tetragonal distortion in the TiO6 octahedron. In contrast, eg band splitting is absent in BxSTO.
ACCESSION #
18008425

 

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