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Phase Diagram of the W-doped Pb(Zn1/3Nb2/3)O3–BaTiO3– PbTiO3 System Around a Morphotropic Phase Boundary Composition

Published online by Cambridge University Press:  31 January 2011

W. Z. Zhu ,
M. Yan ,
A. L. Kholkin ,
P. Q. Mantas  and
J. L. Baptista
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 morphotropic phase boundary (MPB) composition that is characterized by the coexistence of rhombohedral and tetragonal phases in the Pb(Zn1/3Nb2/3)O3–BaTiO3– PbTiO3 system was modified by W-doping at the B site of a perovskite structural block. To maintain the electrical neutrality, creation of A-site vacancies was intentionally introduced in the formulation of the examined compositions. Incorporation of W ions was revealed to stabilize the tetragonal phase against the rhombohedral one, shifting the MPB toward the PZN-rich end at room temperature. High-temperature x-ray diffraction examination in combination with dielectric measurements discloses two successive phase transitions as a sample is cooled from high temperature, namely, paraelectric cubic to ferroelectric rhombohedral followed by ferroelectric rhombohedral to ferroelectric tetragonal. W addition appears to suppress the first transition while promoting the second one.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1085 - 1091
Copyright
Copyright © Materials Research Society 2002

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