Dielectric properties of Pb[(1−x)(Zr1/2Ti1/2)−x(Zn1/3Ta2/3)]O3 ceramics prepared by columbite and wolframite methods
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Polycrystalline samples of Pb[(1 − x)(Zr1/2Ti1/2) − x(Zn1/3Ta2/3)]O3, where x = 0.1–0.5 were prepared by the columbite and wolframite methods. The crystal structure, microstructure, and dielectric properties of the sintered ceramics were investigated as a function of composition via X-ray diffraction (XRD), scanning electron microscopy (SEM), and dielectric spectroscopy. The results indicated that the presence of Pb(Zn1/3Ta2/3)O3 (PZnTa) in the solid solution decreased the structural stability of overall perovskite phase. A transition from tetragonal to pseudo-cubic symmetry was observed as the PZnTa content increased and a co-existence of tetragonal and pseudo-cubic phases was observed at a composition close to x = 0.1. Examination of the dielectric spectra indicated that PZT–PZnTa exhibited an extremely high relative permittivity at the MPB composition. The permittivity showed a ferroelectric to paraelectric phase transition at 330 °C with a maximum value of 19,600 at 100 Hz at the MPB composition.
KeywordsPerovskite Perovskite Phase Morphotropic Phase Boundary Pyrochlore Phase Diffuse Phase Transition
This work was supported by the Thailand Research Fund (TRF), the Commission on Higher Education (CHE), the National Research Council of Thailand (NRCT), and the King Mongkut’s Institute of Technology Ladkrabang (KMITL).
- 1.Uchino K (2000) Ferroelectric devices. Marcel Dekker, Inc., New YorkGoogle Scholar
- 3.Jaffe B, Cook WR (1971) Piezoelectric ceramic. R.A.N. PublishersGoogle Scholar
- 6.Xu Y (1991) Ferroelectric materials and their application. Elsevier Science Publishers B.VGoogle Scholar
- 10.Bing Y-H, Ye Z-G (2006) J Cryst Growth 287:326. The 16th American Conference on Crystal Growth and Epitaxy – ACCGE 16Google Scholar
- 11.Cornejo IA, Jadidian B, Akdogan EK, Safari A (1998) Dielectric and Electromechanical properties of PNN–PT–PZ system: a processing-property study. In: Proc IEEE ISAF’98Google Scholar
- 13.Shrout TR, Halliyal A (1987) Am Ceram Soc Bull 66:704Google Scholar