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Crystal Structures of SrBi2Ta2O9 and Sr0.8Bi2.2Ta2O9 Ferroelectric Materials

Published online by Cambridge University Press:  10 February 2011

Y. Shimakawai ,
Y. Nakagawa ,
Y. Kubo ,
T. Kamiyama  and
H. Asano
Y. Shimakawai
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba 305-8501, [email protected]
Y. Nakagawa
Affiliation:
Institute for Materials Science, University of Tsukuba, Tsukuba 305-8577, Japan
Y. Kubo
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan
T. Kamiyama
Affiliation:
Institute for Materials Science, University of Tsukuba, Tsukuba 305-8577, Japan
H. Asano
Affiliation:
Institute for Materials Science, University of Tsukuba, Tsukuba 305-8577, Japan
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Abstract

Structural and ferroelectric properties of stoichiometric SrBi2Ta2O9 and Sr-deficient-and-Bi-excess Sr0.8Bi2.2Ta2O9 bulk ceramics materials are studied. The ferroelectric Curie temperatures for SrBi2Ta2O9 and Sr0.8Bi2.2Ta2O9 are 300 and 400°C, respectively. Structure analysis by neutron powder diffraction reveals that Bi2O2 layer and TaO6 octahedra are considerably distorted and that atomic displacement along the a-axis causes ferroelectric spontaneous polarization. In Sro8Bi22Ta2O9, both Bi-substitution and cation-vacancies exist at the Sr-site. The calculated polarization of Sr0.8Bi2.2Ta2O9 is higher than that of the stoichiometric sample, which is consistent with observations of remanent polarization in thin-film capacitors. The Bi-substitution and the cation-vacancies at the Sr site enhance structural distortion in the TaO6 octahedron and lead to the higher Curie temperature and the higher ferroelectric spontaneous polarization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 541: Symposium O – Ferroelectric Thin Films VII , 1998 , 523
Copyright
Copyright © Materials Research Society 1999

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References

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