Production of Sr-deficient bismuth tantalates from microwave-hydrothermal derived precursors: Structural and dielectric properties |
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Authors: | Anderson Dias Roberto L Moreira |
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Institution: | a Departamento de Química, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, 35400-000 Ouro Preto-MG, Brazil b Departamento de Física, ICEx, UFMG, C.P. 702, Belo Horizonte-MG 30123-970, Brazil |
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Abstract: | Strontium bismuth tantalates were produced for the first time from microwave-hydrothermal precursors at , for 2 h. Structural and dielectric properties were investigated by X-ray diffraction and complex impedance spectroscopy. A high ferroelectric-paraelectric transition temperature of was observed, together with two different dielectric regimes for the ac electrical conductivity below Tc. The activation energies were calculated as 0.155 and 0.531 eV, and are related to conduction by oxygen vacancies. It was concluded that the low activation energies showed by these materials could contribute to their fatigue-free nature. |
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Keywords: | A Ceramics B Chemical synthesis D Dielectric properties |
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