Dielectric Properties and Phase Transitions in Hetero-Valent-Ion-Substituted (Bi0.5Na0.5)TiO3 Ceramics

다국어 초록 (Multilingual Abstract)

Off-valent-cation (W6+/Nb5+/Sc3+)-substituted lead-free piezoelectric (Bi0.5Na0.5)TiO3 (BNT)ceramics with a single rhombohedral symmetry were fabricated by using a solid state reaction method, and the effects of substitution on the dielectric properties and the transition temperatures were investigated. The dielectric constants, ∈',slightly increased with increasing metal ion concentration.
The depolarization temperature, Td, the imaginary dielectric constant ∈", the maximum dielectric constant ∈'max, and the temperature Tm of the maximum dielectric constant decreased with increasing W and Nb concentration, except for Sc. The thermal hysteresis increased with increasing W and Nb content, the rhombohedral-tetragonal phase transition temperature TR−T decreased on cooling, and TR−T remained constant on heating.

참고문헌 (Reference)

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