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- Title
Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−xGd<sub>x</sub>TiNbO<sub>9</sub> (x=0, 0.1, 0.2, 0.3) with high Curie temperature.
- Authors
Zubkov, S. V.
- Abstract
The Aurivillius phases (APs) [Bi2O2] 2 + [ A m − 1 B m O 3 m + 1 ] 2 − are well-known ferroelectrics with high Curie temperatures. High-temperature piezoceramics Bi 3 − x GdxTiNbO9(BiGdTiNb, x = 0 , 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BiGdTiNb ceramics have been studied. According to the data of powder X-ray diffraction, all the compounds are single-phase with the structures of two-layer APs (m = 2) with the orthorhombic crystal lattice (space group A 2 1 a m). The temperature dependence of the relative permittivity ε ∕ ε 0 (T) of the compounds was measured and showed that the Curie temperature of perovskite-like oxides Bi 3 − x GdxTiNbO9 increases linearly with an increase in the substitution parameter x to T C = 9 5 0 ∘ C. The activation energies of charge carriers have been found in different temperature ranges.
- Subjects
CRYSTAL structure; DIELECTRIC properties of perovskite; SOLID solutions; CURIE temperature; ORTHORHOMBIC crystal system
- Publication
Journal of Advanced Dielectrics, 2020, Vol 10, Issue 1/2, pN.PAG
- ISSN
2010-135X
- Publication type
Article
- DOI
10.1142/S2010135X20600024