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Dielectric and piezoelectric properties of the thermally annealed Pb(Zn,Mg)1/3Nb2/3O3–PbTiO3 system across the rhombohedral/tetragonal morphotropic phase boundary

Published online by Cambridge University Press:  03 March 2011

Hyun M. Jang  and
Kyu-Mann Lee
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Laboratory for Physical Chemistry of Dielectric Materials, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
Kyu-Mann Lee
Affiliation:
Department of Materials Science and Engineering, and Laboratory for Physical Chemistry of Dielectric Materials, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
*
a)Author to whom correspondence should be addressed.
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Abstract

Effects of thermal annealing on the dielectric/piezoelectric properties of Pb(Zn,Mg)1/3Nb2/3O3-PbTiO3 ceramics (PZMN-PT with Zn/Mg = 6/4) were examined across the rhombohedral/tetragonal morphotropic phase boundary (MPB). Examination of the lattice parameters and the rhombohedral angle indicated that the MPB is in the vicinity of 24 mol% PbTiO3. Both the relative dielectric permittivity (∊r) and the piezoelectric constant (d33)/electromechanical coupling constant (kp) were increased by thermal annealing (800–900 °C) after sintering at 1150 °C for 1 h. The observed improvements in the dielectric and piezoelectric properties were attributed to the elimination of PbO-rich amorphous intergranular layers (about 1 nm thickness) induced by thermal annealing. Both the dielectric analysis using the series mixing model and the microscopic examination by transmission electron microscopy supported this conclusion.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 12 , December 1995 , pp. 3185 - 3193
Copyright
Copyright © Materials Research Society 1995

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