Ho0.5Pr0.5FeO3的磁性与巨磁介电效应

doi:10.3724/SP.J.1077.2014.12733

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 77-80.DOI: 10.3724/SP.J.1077.2014.12733

Ho_0.5Pr_0.5FeO₃的磁性与巨磁介电效应

谢慧¹, 袁淑娟¹, 康保娟¹, 鲁波², 曹世勋¹, 张金仓¹

(上海大学1. 物理系; 2. 微结构实验室, 上海200444)

收稿日期:2012-12-04 修回日期:2013-03-16 出版日期:2014-01-20 网络出版日期:2013-12-09
作者简介:谢慧(1987-), 女, 硕士研究生. E-mail: xiehui19870620@163.com
基金资助:
国家自然科学基金(11274221, 50932003, 11074163); 上海市教育委员会科技创新项目(12YZ018)

Giant Magnetodielectric Effect and Magnetic Properties of Ho_0.5Pr_0.5FeO₃ Ceramics

XIE Hui¹, YUAN Shu-Juan¹, KANG Bao-Juan¹, LU Bo², CAO Shi-Xun¹, ZHANG Jin-Cang¹

(1. Department of Physics, Shanghai University, Shanghai 200044, China; 2. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China)

Received:2012-12-04 Revised:2013-03-16 Published:2014-01-20 Online:2013-12-09
About author:XIE Hui. E-mail: xiehui19870620@163.com
Supported by:
National Natural Science Foundation of China (11274221, 50932003, 11074163); Research Innovation Fund of the Shanghai Education Committee (12YZ018)

摘要/Abstract

摘要： 采用固相反应法制备了Ho_0.5Pr_0.5FeO₃多晶样品, 对其磁性和磁介电特性进行了系统研究。在T=4.5 K附近存在Ho离子的反铁磁相变, 在T= 59 ~80K可观测到Fe离子的自旋重取向转变, 磁滞回线表明样品呈现弱铁磁性。在T= 270 K, 介电常数可达~10³, 研究表明该介电常数与270 K附近的电阻变化相关联, 该处电阻变小, 介质损耗减小, 导致介电值变大。尤其重要的是, 该样品在室温下表现出磁场诱导的巨磁介电效应, 在频率 kHz、外加磁场为1.6×10⁶ A/m下, 其值可达5500%, 该巨磁介电效应可能来源于磁电阻效应。

关键词: 磁介电效应, 介电常数, 固相反应, 自旋重取向

Abstract: Polycrystalline sample Ho_0.5Pr_0.5FeO₃ was prepared by a solid state reaction method. The magnetic properties and magnetodielectric effect of the sample were investigated. The results show that the Ho³⁺ antiferromagnetoly orders at T=4.5 K and the Fe³⁺ spin reorientation transition occurs at 59-80 K. The sample exhibits a colossal dielectric constant value of ~10³around 270 K, which is correlated with a resistance transition at 270 K. The decrease of the resistance and the dielectric loss lead to the increase of the dielectric constant. Most importantly, a magnetic field of 1.6×10⁶ A/m can induce a giant magnetodielectric response of 5500% under?kHz at room temperature. The giant magnetodielectric effect might come from the magnetorisistance effect.

Key words: magnetodielectric effect, dielectric constant, solid state reaction, spin reorientation

中图分类号:

TQ174

谢慧, 袁淑娟, 康保娟, 鲁波, 曹世勋, 张金仓 . Ho_0.5Pr_0.5FeO₃的磁性与巨磁介电效应[J]. 无机材料学报, 2014, 29(1): 77-80.

XIE Hui, YUAN Shu-Juan, KANG Bao-Juan, LU Bo, CAO Shi-Xun, ZHANG Jin-Cang. Giant Magnetodielectric Effect and Magnetic Properties of Ho_0.5Pr_0.5FeO₃ Ceramics[J]. Journal of Inorganic Materials, 2014, 29(1): 77-80.

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Ho_0.5Pr_0.5FeO₃的磁性与巨磁介电效应

Giant Magnetodielectric Effect and Magnetic Properties of Ho_0.5Pr_0.5FeO₃ Ceramics

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