Structure and dielectric dispersion in cubic-like 0.5K0.5Na0.5NbO3-0.5Na1/2Bi1/2TiO3 ceramic

被引：52

作者：

Liu, Laijun ^{[1
,2
]}

Knapp, Michael ^{[1
]}

Schmitt, Ljubomira Ana ^{[3
]}

Ehrenberg, Helmut ^{[1
]}

Fang, Liang ^{[2
]}

Fuess, Hartmut ^{[3
]}

Hoelzel, Markus ^{[4
]}

Hinterstein, Manuel ^{[1
,5
]}

机构：

[1] Karlsruhe Inst Technol, Inst Appl Mat, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[2] Guilin Univ Technol, Coll Mat Sci & Engn, Guangxi Univ Key Lab Nonferrous Met Oxide Elect F, Guilin 541004, Peoples R China

[3] Tech Univ Darmstadt, Inst Mat & Geosci, Alarich Weiss Str 2, D-64287 Darmstadt, Germany

[4] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, Lichtenbergstr 1, D-85747 Garching, Germany

[5] UNSW Australia, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

来源：

EPL | 2016年 / 114卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

PHASE-TRANSITION; ELECTRICAL-PROPERTIES; BEHAVIOR; DIFFRACTION;

D O I：

10.1209/0295-5075/114/47011

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nature of the cubic-like state in the lead-free piezoelectric ceramics 0.5K(0.5)Na(0.5)NbO(3)-0.5Na(1/2)Bi(1/2)TiO(3) (KNN-50BNT) has been examined in detail by synchrotron x-ray diffraction (SD), selected-area electron diffraction (SAED), neutron diffraction (ND), and temperature-dependent dielectric characterization. The SD pattern of KNN-50BNT presents a pure perovskite structure with pseudocubic symmetry. However, superlattice reflections were observed by SAED and completely indexed by tetragonal symmetry with P4bm space group in ND pattern. The relaxor behavior of KNN-50BNT is compared with Pb-based and Ba-based relaxors and discussed in the framework of the Vogel-Fulcher law and the new glass model. The KNN-50BNT ceramic exhibits the strongest dielectric dispersion among them. Copyright (C) EPLA, 2016

引用

页数：5

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