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Ferroelectric relaxor properties of (1 − x)K0.5Na0.5NbO3–xBa0.5Ca0.5TiO3 ceramics
조창우,차민령,장지영,이승환,김동진,박성균,배종성,부상돈,이상근,허정원 한국물리학회 2012 Current Applied Physics Vol.12 No.5
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 CurieeWeiss exponent to 2, which the exponent for a relaxor ferroelectric.