Room temperature ferroelectricity in multiferroic HoMnO3 ceramics

被引：19
|
作者：
Rout, P. P. [1 ]
Pradhan, S. K. [1 ]
Das, S. K. [1 ]
Roul, B. K. [1 ]
机构：
[1] Inst Mat Sci Agh, Bhubaneswar 751013, Orissa, India
来源：
PHYSICA B-CONDENSED MATTER | 2012年 / 407卷 / 12期
关键词：
Ceramics; Photoelectron spectroscopy; Dielectric; X-ray diffraction; Ferroelectricity; MAGNETIC-STRUCTURE; EVOLUTION; YMNO3;
D O I：
10.1016/j.physb.2012.02.007
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have observed good ferroelectric loops at room temperature in hexagonal HoMnO3 (HMO) bulk ceramics sintered at 1250 degrees C. Microstructure and ferroelectric hysteresis loops are observed to be dependent on sintering temperature. It is observed that with an increase of sintering temperature, hexagonal a-axis is compressed and c-axis is marginally dilated with overall contraction of the hexagonal unit-cell volume. We explain the origin of ferroelectricity through relative movement of Ho ion and Mn ion within its unit-cell volume, resulting in the distortion of unit-cell volume. We argue that ferroelectric origin of hexagonal HMO at room temperature may be due to the marginal displacement of Ho ion along a-axis, that influences the exchange interaction among the Mn3+ and Ho3+ ions, causing magnetically induced ferroelectricity at room temperature. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：2072 / 2077
页数：6
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