Diffuse Phase Transition and Dielectric Tunability of Ba0.97La0.02TiO3 Relaxor Ferroelectric Ceramic (original) (raw)

2022, Journal of Inorganic and Organometallic Polymers and Materials

Barium zirconate titanate Ba(Zr y Ti 1Ày)O 3 (BZT, y = 0.2, 0.25, 0.30, 0.35) ceramics have been prepared by a sol-gel process. The temperature dependence of dielectric permittivity of the ceramics has been investigated. The results show that the phase transition temperature T C (or T m) is suppressed with increasing Zr content. The degree of diffuseness of the phase transition is more pronounced for higher Zr content, implying the existence of a composition-induced diffuse phase transition of the ceramics with 0.20 6 y 6 0.35. For BZT ceramics with y > 0.25, a relaxor ferroelectric characteristic is observed. High tunability and figure of merit are obtained in BZT compositions investigated, which imply that these ceramics are promising materials for tunable capacitor applications.

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