期刊
APPLIED PHYSICS LETTERS
卷 93, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3049612
关键词
ab initio calculations; bismuth compounds; ferroelectric materials; ferroelectric transitions; strontium compounds; tantalum compounds
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnologicas de la Republica Argentina (CONICET)
- CIUNR
The phase transition sequence of SrBi2Ta2O9 is investigated using a shell model with parameters fitted to first-principles calculations. We show that the complex interplay between polar and nonpolar instabilities leads to the presence of two phase transitions, corroborating the existence of an intermediate orthorhombic paraelectric phase. This phase is characterized by the rotation of the TaO6 octahedra around the a axis. We show that this phase can also be detected from the dielectric response of the material. The present approach constitutes a powerful tool for a theoretical prediction of intermediate phases, not yet observed experimentally, in other Aurivillius compounds.
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