Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7

被引：34

作者：

Sun, Li ^{[1
]}

Hu, Jifan ^{[1
]}

Gao, Feng ^{[1
]}

Kong, Xiangwei ^{[1
]}

Qin, Hongwei ^{[1
]}

Jiang, Minhua ^{[1
]}

机构：

[1] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 502卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Nanocrystalline; Multiferroic material; Ferromagnetism; Ferroelectricity; POLARIZATION; MAGNETISM; OXIDE;

D O I：

10.1016/j.jallcom.2010.04.137

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

La2Ti2O7 nanocrystalline powders and pellets were prepared by sol-gel method. The nanocrystalline powders present room-temperature ferromagnetism (FM). The vacuum annealing enhances FM, showing that the observed room-temperature FM for La2Ti2O7 possibly originates from oxygen vacancies at/near surfaces of nanograins. La2Ti2O7 pellets annealed at 1000 degrees C for 1 h show the coexistence of ferromagnetism and ferroelectricity (FE) at room temperature. Meanwhile, the room-temperature magnetodielectric (MD) effect was also observed in the La2Ti2O7 multiferroic pellet, indicating the coupling between magnetic and electric properties. The value of Delta epsilon(r)/epsilon(r)(0) for La2Ti2O7 multiferroic pellet reaches 39.3% at 1 kHz under H = 6 kOe. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：176 / 179

页数：4

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