Raman study of low temperature phase transitions in bismuth titanate, Bi4Ti3O12
1994; American Institute of Physics; Volume: 76; Issue: 3 Linguagem: Inglês
10.1063/1.357700
ISSN1520-8850
AutoresH. Idink, V. Srikanth, William B. White, E. C. Subbarao,
Tópico(s)Multiferroics and related materials
ResumoAn anomalous line narrowing along with the appearance of several new lines on cooling Bi4Ti3O12 ceramics, indicates a subtle phase transition in the 150–200 K region. In the same temperature range, anomalies in dielectric properties (dielectric constant, coercive field, and spontaneous polarization) of single-crystal Bi4Ti3O12 were reported. A possible subtle monoclinic-orthorhombic phase change, combined with a continuous ordering of dipoles associated with Bi3+ lone pair electrons and TiO6 octahedra, may be responsible for these results.
Referência(s)