Coexistence of ergodicity and nonergodicity in LaFeO3-modified Bi1/2(Na0.78K0.22)1/2TiO3 relaxors

被引：94
作者：
Han, Hyoung-Su [1 ]
Jo, Wook [2 ]
Roedel, Juergen [2 ]
Hong, In-Ki [3 ]
Tai, Weon-Pil [3 ]
Lee, Jae-Shin [1 ]
机构：
[1] Univ Ulsan, Sch Mat Sci & Engn, Ulsan 680749, South Korea
[2] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany
[3] Ulsan Fine Chem Ind Ctr, Ulsan, South Korea
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2012年 / 24卷 / 36期
基金：
新加坡国家研究基金会;
关键词：
INDUCED PHASE-TRANSITION; TRANSMISSION ELECTRON-MICROSCOPY; GIANT STRAIN; CERAMICS; PIEZOCERAMICS; BEHAVIOR;
D O I：
10.1088/0953-8984/24/36/365901
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effect of LaFeO3 addition to Bi-1/2(Na0.78K0.22)(1/2)TiO3 ceramics on the phase stability and macroscopic functional properties was investigated. Similarly to other chemical modifiers known in the literature, LaFeO3 addition suppresses an electric-field-induced long-range ferroelectric order, giving rise to a giant unipolar strain of similar to 0.3% at 2 mol% LaFeO3 addition. Time-dependent changes in polarization and strain hysteresis loops both during successive electrical cycling and after removal of the electric field suggest that a specimen with 2 mol% LaFeO3 consists of both ergodic and nonergodic phases, which is unique among the known relaxor materials.
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页数：6
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