磁性离子基团耦合激发Bi5FeTi3O15材料中的铁磁性

doi:10.3724/SP.J.1077.2010.01263

无机材料学报 ›› 2010, Vol. 25 ›› Issue (12): 1263-1267.DOI: 10.3724/SP.J.1077.2010.01263 CSTR: 32189.14.SP.J.1077.2010.01263

磁性离子基团耦合激发Bi₅FeTi₃O₁₅材料中的铁磁性

王伟, 胡星, 毛翔宇, 陈小兵

(扬州大学物理科学与技术学院, 扬州 225002)

收稿日期:2010-04-05 修回日期:2010-05-16 出版日期:2010-12-20 网络出版日期:2010-11-24
基金资助:
国家自然科学基金(10274066); 江苏省教育厅自然科学基础研究项目(08KJB140011)

Ferromagnetism in the Multiferroic Bi₅FeTi₃O₁₅ Ceramics Arising from the Magnetic Coupling

WANG Wei, HU Xing, MAO Xiang-Yu, CHEN Xiao-Bing

(College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China)

Received:2010-04-05 Revised:2010-05-16 Published:2010-12-20 Online:2010-11-24
Supported by:
National Nature Science Foundation of China (10274066); Nature Science Foundation of Provincial Department of Education of Jiangsu (08KJB140011)

摘要/Abstract

摘要： 采用固相反应法, 制备了Bi₅Fe_1-xCo_xTi₃O₁₅ (BFCT-x, x = 0.0~0.6)陶瓷样品. 掺杂后样品的剩余磁化强度(2M_r)和剩余极化强度(2P_r)都得到了提高, 并以磁性能改善最为明显, 在室温下显示为铁磁性. BFCT-0.5样品的磁化强度达到2.3 mA·m²/kg, 比未掺杂高两个数量级. 样品铁磁性的增强可能来源于Fe-O-Co耦合. 样品的铁电性能随掺杂量的变化则表现为增强、减弱、再增强趋势. 这一趋势是由掺杂导致的晶格畸变、电荷补偿以及共价键的变化所共同决定.

关键词: 多铁陶瓷, 剩余磁化, 剩余极化

Abstract: Multiferroic Bi₅Fe_1-xCo_xTi₃O₁₅ (x = 0~0.6) ceramics were prepared using solid state reaction method. XRD pattern confirmed the single phase in all prepared samples and Raman scattering technique was also used to study the crystal structure. The remanent magnetization (2M_r) is increased to a high value of 2.3 mA·m²/kg with the cobalt content of 0.5. This value is two orders of magnitude greater than that of non-doped one. The promising ferromagnetism is attributed to the coupling arising from local Fe-O-Co clusters as well as the influence of net magnetic moment of Fe-O-Co clusters on the magnetic behavior. The remanent polarization (2P_r) is increased by a small amount of cobalt of 0.1, then decreased with further doing of cobalt up to 0.4, after that, 2P_r is increased again up to a cobalt content of 0.6. The dependence of 2P_r on cobalt content is attributed to the joint effect of lattice distortion, charge compensation and the change of covalent bonding condition.

Key words: multiferroic ceramics, remanent magnetization, remanent polarization

中图分类号:

O469
O437

王伟, 胡星, 毛翔宇, 陈小兵. 磁性离子基团耦合激发Bi₅FeTi₃O₁₅材料中的铁磁性 [J]. 无机材料学报, 2010, 25(12): 1263-1267.

WANG Wei, HU Xing, MAO Xiang-Yu, CHEN Xiao-Bing. Ferromagnetism in the Multiferroic Bi₅FeTi₃O₁₅ Ceramics Arising from the Magnetic Coupling[J]. Journal of Inorganic Materials, 2010, 25(12): 1263-1267.

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磁性离子基团耦合激发Bi₅FeTi₃O₁₅材料中的铁磁性

Ferromagnetism in the Multiferroic Bi₅FeTi₃O₁₅ Ceramics Arising from the Magnetic Coupling

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