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Dielectric Behavior of Mn-doped Morphotropic Phase Boundary Composition in the Pb(Zn1/3Nb2/3)O3–BaTiO3– PbTiO3 System

Published online by Cambridge University Press:  31 January 2011

W. Z. Zhu
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
M. Yan
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
A. L. Kholkin
Affiliation:
Department of Ceramic and Glass Engineering, University of Aveiro, UIMC, 3810–193 Aveiro, Portugal
P. Q. Mantas
Affiliation:
Department of Ceramic and Glass Engineering, University of Aveiro, UIMC, 3810–193 Aveiro, Portugal
J. L. Baptista
Affiliation:
Department of Ceramic and Glass Engineering, University of Aveiro, UIMC, 3810–193 Aveiro, Portugal
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Extract

The dielectric behavior of manganese-doped morphotropic phase boundary (MPB) composition in the Pb(Zn1/3Nb2/3)O3–BaTiO3–PbTiO3 (PZN–BT–PT) system is described in this paper. Materials with perovskite structure were fabricated using the precursor approach. Addition of Mn stabilized the rhombohedral phase against the tetragonal one, moving the MPB territory toward the PbTiO3-rich side. Both the dielectric permittivity maximum (∈m) and phase transition temperature (Tmax) were reduced by increasing Mn2+ content. Frequency-dispersion characteristics of Tmax were weakened while the frequency spectrum of the dielectric permittivity (∈) was broadened, reflecting different underlying mechanisms. The broadness of paraelectric to ferroelectric phase transition was significantly enhanced by Mn-doping. This was associated with progressive increase in the degree of chemical heterogeneity on B-site cations. The observed proximity of the non-Curie–Weiss region to Tmax as well as shrinkage of this region for doped compositions suggest increased stability of the ferroelectric phase.

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Articles
Copyright
Copyright © Materials Research Society 2002

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