Direct observation of oxygen stabilization in layered ferroelectric Bi3.25La0.75Ti3O12

Electron charge density distributions in layered ferroelectrics Bi4Ti3O12 (BiT) and Bi3.25La0.75Ti3O12 (BLT) are investigated by analyzing high-energy synchrotron-radiation powder diffraction data using the maximum entropy method/Rietveld method. BiT shows that chemical bonding resulting from orbita...

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Bibliographic Details
Published in:Applied physics letters 2007-08, Vol.91 (6)
Main Authors: Kim, Su Jae, Moriyoshi, Chikako, Kimura, Sayaka, Kuroiwa, Yoshihiro, Kato, Kenichi, Takata, Masaki, Noguchi, Yuji, Miyayama, Masaru
Format: Article
Language:English
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Summary:Electron charge density distributions in layered ferroelectrics Bi4Ti3O12 (BiT) and Bi3.25La0.75Ti3O12 (BLT) are investigated by analyzing high-energy synchrotron-radiation powder diffraction data using the maximum entropy method/Rietveld method. BiT shows that chemical bonding resulting from orbital hybridization is established between Bi–O in the perovskite layer only along the a axis, whereas BLT exhibits isotropic chemical bonding of Bi∕La–O with a high electron density both along the a and b axes. High endurance to polarization fatigue reported for BLT films is suggested to originate from the stabilization of oxygen in the perovskite layer due to the isotropic chemical bonding of Bi∕La–O.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2768906