Direct observation of oxygen stabilization in layered ferroelectric Bi3.25 La0.75 Ti3 O12

Su Jae Kim, Chikako Moriyoshi, Sayaka Kimura, Yoshihiro Kuroiwa, Kenichi Kato, Masaki Takata, Yuji Noguchi, Masaru Miyayama

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Abstract

Electron charge density distributions in layered ferroelectrics Bi4 Ti3 O12 (BiT) and Bi3.25 La0.75 Ti3 O12 (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 BiLa-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 BiLa-O.

Original languageEnglish
Article number062913
JournalApplied Physics Letters
Volume91
Issue number6
DOIs
Publication statusPublished - 2007 Aug 17
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Kim, S. J., Moriyoshi, C., Kimura, S., Kuroiwa, Y., Kato, K., Takata, M., Noguchi, Y., & Miyayama, M. (2007). Direct observation of oxygen stabilization in layered ferroelectric Bi3.25 La0.75 Ti3 O12. Applied Physics Letters, 91(6), [062913]. https://doi.org/10.1063/1.2768906