TITLE

Universal phase diagram for high-piezoelectric perovskite systems

AUTHOR(S)
Cox, D. E.; Noheda, B.; Shirane, G.; Uesu, Y.; Fujishiro, K.; Yamada, Y.
PUB. DATE
July 2001
SOURCE
Applied Physics Letters;7/16/2001, Vol. 79 Issue 3
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Strong piezoelectricity in perovskite-type PbZn[sub 1-x]Ti[sub x]O[sub 3] (PZT) and Pb(Zn[sub 1/3]Nb[sub 2/3])O[sub 3]–PbTiO[sub 3] (PZN–PT) systems is generally associated with the existence of a morphotropic phase boundary (MPB) separating regions with rhombohedral and tetragonal symmetry. An x-ray study of PZN–9% PT has revealed the presence of an orthorhombic phase at the MPB, and a near-vertical boundary between the rhombohedral and orthorhombic phases, similar to that found for PZT between the rhombohedral and monoclinic phases. We discuss the results in the light of a recent theoretical paper by Vanderbilt and Cohen [Phys. Rev. B 63, 94108 (2001)], which attributes these low-symmetry phases to the high anharmonicity in these oxide systems. © 2001 American Institute of Physics.
ACCESSION #
4812758

 

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