Ferroelectric relaxor properties of (1 − x)K0.5Na0.5NbO3–xBa0.5Ca0.5TiO3 ceramics

The Ba0.5Ca0.5TiO3 (BCT) composition dependent dielectric and structural properties of (1−x)K0.5Na0.5NbO3–xBa0.5Ca0.5TiO3 powders were investigated. Room temperature x-ray diffraction revealed the powder structure to transform from orthorhombic to cubic with increasing BCT composition. The frequency...

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Veröffentlicht in:Current applied physics 2012, 12(5), , pp.1266-1271
Hauptverfasser: Cho, C.-W., Cha, M.R., Jang, J.Y., Lee, S.H., Kim, D.J., Park, S., Bae, J.S., Bu, S.D., Lee, S., Huh, J.
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Sprache:eng
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Zusammenfassung:The Ba0.5Ca0.5TiO3 (BCT) composition dependent dielectric and structural properties of (1−x)K0.5Na0.5NbO3–xBa0.5Ca0.5TiO3 powders were investigated. Room temperature x-ray diffraction revealed the powder structure to transform from orthorhombic to cubic with increasing BCT composition. The frequency dependent dielectric constant measurements revealed a shift in the temperature of the maximum dielectric constant for at frequencies, suggesting that the system exhibits ferroelectric relaxor behavior. The system containing 15% BCT showed the closest calculated Curie–Weiss exponent to 2, which the exponent for a relaxor ferroelectric. ► The physical properties of Pb-free relaxor ferroelectric ceramics are studied. ► Room temperature XRD revealed the structure to transform with BCT concentration. ► 15% of BCT sample showed the closest calculated Curie–Weiss exponent to 2.
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2012.03.006