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Crossover of Ba(Ti,Y)O3 Solid Solutions to Ba3Ti2YO8.5–BaTiO3 Composites and their Dielectric Properties

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Ceramic samples with the nominal composition (1−x) BaTiO3+x Ba3Ti2YO8.5 (x=0−0.535) were prepared by the mixed oxide method. X-ray diffraction (XRD) analysis shows that the materials are of single phase with a cubic symmetry as x≤0.16. The compositions of the solid solutions (x≤0.16) can be expressed equivalently as Ba(Ti1−yYy)O3− (y≤0.122, y=x/(1+2x)). For x>0.16, the materials are diphasic composites consisting of Ba(Ti1−yYy)O3 (y=0.122) and Ba3Ti2YO8.5. The microstructure observation by scanning electron microscopy supports the XRD result. The dielectric behavior and phase transitions of the solid solutions (x≤0.16) vary with different Y concentrations. The dielectric constant of the composites (x>0.16) follows approximately the Lichteneker relation in a wide temperature range.
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Document Type: Research Article

Affiliations: Department of Physics, The University of Akron, Akron, Ohio 44325

Publication date: 2005-10-01

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