A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

被引：167

作者：

Zhu, X. ^{[1
]}

Fu, M. ^{[2
]}

Stennett, M. C. ^{[3
]}

Vilarinho, P. M. ^{[4
]}

Levin, I. ^{[5
]}

Randall, C. A. ^{[6
]}

Gardner, J. ^{[7
]}

Morrison, F. D. ^{[7
]}

Reaney, I. M. ^{[3
]}

机构：

[1] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310003, Zhejiang, Peoples R China

[2] Northwestern Polytech Univ, Shanxi Mat Anal & Res Ctr, Sch Mat Sci & Engn, Xian 710000, Peoples R China

[3] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

[4] Univ Aveiro, Aveiro Mat Inst, Dept Mat & Ceram Engn CICECO, P-3810193 Aveiro, Portugal

[5] NIST, Mat Measurement Sci Div, Gaithersburg, MD 20899 USA

[6] Penn State Univ, Ctr Dielect & Piezoelect, Mat Res Inst, University Pk, PA 16802 USA

[7] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

来源：

CHEMISTRY OF MATERIALS | 2015年 / 27卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

LEAD BARIUM NIOBATE; PBN SINGLE-CRYSTALS; DIELECTRIC-PROPERTIES; INCOMMENSURATE SUPERSTRUCTURES; PYROELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; PHASE-TRANSITION; RARE-EARTH; CERAMICS; SYSTEM;

D O I：

10.1021/acs.chemmater.5b00072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Tetragonal tungsten bronzes (TTBs), an important class of oxides known to exhibit ferroelectricity, undergo complex distortions, including rotations of,oxygen octahedra, which give rise to either incommensurately or commensurately modulated superstructures. Many TTBs display broad, frequency-dependent relaxor dieletric behavior rather than sharper frequency-independent normal ferroelectric anomalies, but the exact reasons that favor a particular type of dielectric response for a given composition remain unclear. In this contribution the influence of incommensurate/commensurate dispiacive modulations on the onset of relaxor/ferroelectric behavior in TTBs is assessed in the context of basic crystal-chemical factors, such as positional disorder, ionic radii and polarizabilities, and point defects. We present a predictive crystal-chemical model that rationalizes composition structure properties relations for a broad range of TTB systems.

引用

页码：3250 / 3261

页数：12

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