Nanopolar structure in SrxBa1-xNb2O6 single crystals tuned by Sr/Ba ratio and investigated by piezoelectric force microscopy

被引：128

作者：

Shvartsman, Vladimir V. ^{[1
]}

Kleemann, Wolfgang ^{[1
]}

Lukasiewicz, Tadeusz ^{[2
]}

Dec, Jan ^{[3
]}

机构：

[1] Univ Duisburg Essen, Angew Phys, D-47048 Duisburg, Germany

[2] Inst Elect Mat Technol, PL-01919 Warsaw, Poland

[3] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.77.054105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Complex as-grown nanodomain patterns are studied with piezoresponse force microscopy in SrxBa1-xNb2O6 single crystals at variant Sr/Ba molar ratios, 0.4 <= x <= 0.75. They reflect random-field Ising model (RFIM) ferroelectricity, which crosses over into relaxor behavior at increasing x. This is explained by an increase of the polar disorder within the open tungsten-bronze crystal structure giving rise to enhanced quenched random electric fields at simultaneous decrease of the ferroelectric ordering temperature. The strongly anisotropic domain shapes, their fractal properties and size distributions, and their metastable occurrence above the nominal Curie temperature are in accordance with predictions for the RFIM.

引用

页数：7

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