文章基本信息

标题：Role of random electric fields in relaxors
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作者：Daniel Phelan ; Christopher Stock ; Jose A. Rodriguez-Rivera 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2014
卷号：111
期号：5
页码：1754-1759
DOI：10.1073/pnas.1314780111
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：PbZr1-xTixO3 (PZT) and Pb(Mg1/3Nb2/3)1-xTixO3 (PMN-xPT) are complex lead-oxide perovskites that display exceptional piezoelectric properties for pseudorhombohedral compositions near a tetragonal phase boundary. In PZT these compositions are ferroelectrics, but in PMN-xPT they are relaxors because the dielectric permittivity is frequency dependent and exhibits non-Arrhenius behavior. We show that the nanoscale structure unique to PMN-xPT and other lead-oxide perovskite relaxors is absent in PZT and correlates with a greater than 100% enhancement of the longitudinal piezoelectric coefficient in PMN-xPT relative to that in PZT. By comparing dielectric, structural, lattice dynamical, and piezoelectric measurements on PZT and PMN-xPT, two nearly identical compounds that represent weak and strong random electric field limits, we show that quenched (static) random fields establish the relaxor phase and identify the order parameter.
关键词：lead zirconate titanate ; piezoelectricity ; short-range order ; soft modes ; neutron scattering