Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−x Gdx TiTaO9 (x = 0.0, 0.1, 0.2, 0.3) with high Curie temperature
The Aurivillius phases [Bi2O2][An−1BnO3n+1] are well-known ferroelectrics with high Curie temperatures TC. High-temperature piezoceramics Bi3−xGdxTiTaO9 (BGdTTa, x= 0.0, 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BGdTTa cerami...
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| Formato: | article |
| Lenguaje: | EN |
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World Scientific Publishing
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/ca4c9efaef1c4858b89ccc0c6e27dd35 |
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| Sumario: | The Aurivillius phases [Bi2O2][An−1BnO3n+1] are well-known ferroelectrics with high Curie temperatures TC. High-temperature piezoceramics Bi3−xGdxTiTaO9 (BGdTTa, x= 0.0, 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BGdTTa 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 Aurivillius phases (m = 2) with the orthorhombic crystal lattice (space group A21am). The temperature dependence of the relative permittivity 𝜀/𝜀0 (T) of the compounds was measured and showed that the Curie temperature TC of perovskite-like oxides Bi3−xGdxTiTaO9 increases linearly with an increase in the substitution parameter x to TC = 925∘C. The activation energies of charge carriers have been found in different temperature ranges. |
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