2001年10月22日
Crystal and electronic structures of Bi4-xLaxTi3O12 ferroelectric materials
Applied Physics Letters
- ,
- ,
- ,
- ,
- ,
- ,
- 巻
- 79
- 号
- 17
- 開始ページ
- 2791
- 終了ページ
- 2793
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.1410877
The crystal structures of Bi4Ti3O12 and Bi3.25La0.75Ti3O12 were refined by neutron powder diffraction. Large structural distortions were revealed, and ferroelectric polarizations along the a and c axes were calculated from the displacements of the constituent ions. In Bi3.25La0.75Ti3O12, La atoms substitute for Bi atoms in a perovskite-type unit only, and the substitution causes less distortion of the structure, resulting in smaller spontaneous polarization and lower ferroelectric Curie temperature. Electronic-structure calculations revealed that covalent interaction, which originates from the strong hybridization between Ti 3d and O 2p orbitals, plays an important role in the structural distortion and ferroelectricity of the materials. Changes in ceramic-sample density with sintering temperature give information concerning device fabrication temperature
that is, substituting La for Bi atoms appears to "increase" the synthesis temperature of the Bi4Ti3O12 and Bi3.25La0.75Ti3O12 systems. © 2001 American Institute of Physics.
that is, substituting La for Bi atoms appears to "increase" the synthesis temperature of the Bi4Ti3O12 and Bi3.25La0.75Ti3O12 systems. © 2001 American Institute of Physics.
- リンク情報
- ID情報
-
- DOI : 10.1063/1.1410877
- ISSN : 0003-6951
- SCOPUS ID : 0035934787