Crystal structure and dielectric properties of Ba6−xCaxTi2Nb8O30 tungsten bronze ceramics

Tungsten bronze oxide solid solution Ba6−xCaxTi2Nb8O30 with space group P4bm (No. 100) was prepared by solid state reaction method. Rietveld refinements revealed a decrease in the volume of the unit cell and distortion of the Ti(Nb)O6 octahedra with increasing Ca substitution. Ca substitution increa...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2023/07/01, Vol.131(7), pp.236-241
Main Authors: Someya, Ryusuke, Shan, Yue Jin, Tezuka, Keitaro
Format: Article
Language:eng ; jpn
Subjects:
Coercivity
Crystal structure
Dielectric loss
Dielectric properties
Electric fields
Ferroelectricity
Relaxor ferroelectric
Rietveld refinement
Solid solutions
Substitution reactions
Transition temperature
Tungsten bronze
Tungsten bronze structure
Unit cell
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Summary:Tungsten bronze oxide solid solution Ba6−xCaxTi2Nb8O30 with space group P4bm (No. 100) was prepared by solid state reaction method. Rietveld refinements revealed a decrease in the volume of the unit cell and distortion of the Ti(Nb)O6 octahedra with increasing Ca substitution. Ca substitution increased ferroelectric transition temperature TC and coercive electric field EC of the samples, decreased their dielectric losses D, and gradually declined the frequency dependence of the dielectric constants.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.22170