Mechanical and dielectric relaxation in neodymium-modified bismuth titanate ceramics

被引：23
作者：
Li, W [1 ]
Su, D [1 ]
Zhu, JS [1 ]
Wang, YN [1 ]
机构：
[1] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2004年 / 131卷 / 3-4期
基金：
中国国家自然科学基金;
关键词：
ferroelectric fatigue; internal friction; oxygen vacancy;
D O I：
10.1016/j.ssc.2004.05.008
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The internal friction (IF) and Young's modulus of Bi3.15Nd0.85Ti3O12 (BNT) ceramics were measured using the reed vibration method in the temperature range from 300 to 750 K at kHz frequencies. One high IF peak (P1) associated with a modulus defect appeared around 453 K. This peak is related to the migration of oxygen vacancies among those unequal oxygen positions in the lattice of the ceramics, which makes it possible to determine the concentration of oxygen vacancies by the peak height. Another peak (P2) appeared around 532 K, which is far below the Curie point (around 890 K), and was attributed to the interaction between oxygen vacancies and 90degrees domain walls. These results could be helpful to the understanding of the fatigue mechanisms in ferroelectric materials. (C) 2004 Elsevier Ltd. All rights reserved.
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收藏
页码：189 / 193
页数：5
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