共 52 条
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
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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