Dielectric responses in Mg1/3Ta2/3-replaced Pb[(Zn1/3Nb2/3),Ti]O3 ceramics
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Octahedral lattice sites of Pb[(Zn1/3Nb2/3),Ti]O3 were replaced by 20 at.% Mg1/3Ta2/3 complex to enhance perovskite development, especially at Pb(Zn1/3Nb2/3)O3-rich compositions. Resultant changes in the perovskite formation and associated dielectric responses were investigated. A perovskite structure was identified at Pb(Zn1/3Nb2/3)O3-rich compositions by X-ray diffraction, although the development was rather incomplete. Phase transition modes in the dielectric constant spectra changed from diffuse to sharp ones, regardless of the introduction of Mg1/3Ta2/3. Dielectric maximum temperatures of the ceramics shifted linearly with the compositional change.
KeywordsPerovskite Rutile Diffuse Phase Transition Sharp Phase Transition Perovskite Formation
This study was supported by the Korea Research Foundation Grant (KRF-2001-041-E00456).