稀土正铁氧体Sm0.8Tb0.2FeO3单晶的生长及性能

doi:10.15541/jim20160113

无机材料学报 ›› 2016, Vol. 31 ›› Issue (9): 1004-1008.DOI: 10.15541/jim20160113

• • 上一篇

稀土正铁氧体Sm_0.8Tb_0.2FeO₃单晶的生长及性能

赵向阳¹, 满沛文¹, 谢涛², 武安华¹, 苏良碧¹

(1. 中国科学院上海硅酸盐研究所, 上海200050; 2. 上海应用技术学院, 上海 200235)

收稿日期:2016-03-01 出版日期:2016-09-20 网络出版日期:2016-08-29
作者简介:赵向阳. E-mail: zhaoxiangyang@student.sic.ac.cn

Crystal Growth and Characterization of the Rare-earth Orthoferrite Sm_0.8Tb_0.2FeO₃Single Crystal

ZHAO Xiang-Yang¹, MAN Pei-Wen¹, XIE Tao², WU An-Hua¹, SU Liang-Bi¹

(1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 200235, China)

Received:2016-03-01 Published:2016-09-20 Online:2016-08-29
About author:ZHAO Xiang-Yang(1991–), male, candidate of master degree. E-mail: zhaoxiangyang@student.sic.ac.cn
Supported by:
National Natural Science Foundationof China (51372257, 51572275);Shanghai Engineering Research Center For Sapphire Crystal (14DZ2252500)

摘要/Abstract

摘要：

利用光学浮区法生长Sm_0.8Tb_0.2FeO₃单晶, 采用劳尔背衍射仪对样品质量进行检测并定向。测试了c-切Sm_0.8Tb_0.2FeO₃单晶在零场冷却模式的磁温曲线, 发现其自旋重取向温度范围为360~400 K。总结以前的工作发现Sm_1-_xTb_xFeO₃系列材料的自旋重取向温度随着稀土铽(Tb)含量的增加而线性减小, 这表明Sm_1-_xTb_xFeO₃系列材料中Fe³⁺-Re³⁺之间的超交换作用发生变化。热膨胀测试结果发现Sm_0.8Tb_0.2FeO₃存在三个温度转变区域: ~250 K、350~480 K和 ~700 K。250 K发生的不正常相变是由于铁离子弱铁磁矩诱导的稀土离子磁矩方向的改变造成的, 350~480 K是由于在这一温度范围发生铁离子自旋重取向, 而~700 K发生的相变是由于铁离子自旋由反铁磁有序到顺磁无序的磁转变。

关键词: 正铁氧体, 光学浮区法, 相转变

Abstract:

Sm_0.8Tb_0.2FeO₃ single crystal was grown by the floating zone method. Laue back reflection was used to check the crystal’s quality and orientation. The temperature dependence of the magnetization under ZFC process was measured in an external field 500 Oe along c-axis. A clear spin reorientation is observed in the range of 360-400 K. Considering the recent report that the spin reorientation transition temperature of Sm_1-_xTb_xFeO₃ is linear decreased with the increase of Tb ions content, the present data reveals the changed Fe³⁺-Re³⁺ super-exchange interaction. The curve of temperature dependence of thermal expansion exhibits three phase transitions at about 250 K, 350-480 K, and 700 K, respectively. The abnormal phase transition observed at 250 K may be resulted from the change of rare earth ions moment orientation polarized by Fe³⁺ sub-lattice net moment. The spin reorientation transition takes place in a temperature range from 350 K to 480 K. The iron spins transform from antiferromagnetic ordered arrangement to paramagnetic disordered arrangement at ~700 K.

Key words: orthoferrites, floating zone method, phase transitions

中图分类号:

TQ174

赵向阳, 满沛文, 谢涛, 武安华, 苏良碧. 稀土正铁氧体Sm_0.8Tb_0.2FeO₃单晶的生长及性能[J]. 无机材料学报, 2016, 31(9): 1004-1008.

ZHAO Xiang-Yang, MAN Pei-Wen, XIE Tao, WU An-Hua, SU Liang-Bi. Crystal Growth and Characterization of the Rare-earth Orthoferrite Sm_0.8Tb_0.2FeO₃Single Crystal[J]. Journal of Inorganic Materials, 2016, 31(9): 1004-1008.

图/表 4

Fig. 1 (a) As-grown Sm0.8Tb0.2FeO3 single crystal, (b) the powder XRD pattern of Sm0.8Tb0.2FeO3 polycrystalline rod, and (c) the Laue back diffraction pattern of the c-direction plane cut from the as-grown single crystal

Fig. 2 Temperature dependence of the magnetization of Sm0.8Tb0.2FeO3 single crystal measured in an external field H=500 Oe along c-axis

Fig. 3 Spin reorientation transition temperature of Sm1-xTbxFeO3 dependence of the doping content x. Data are from this work and from the literatures[18, 21-22]

Fig. 4 Temperature dependence of thermal expansion along b-direction

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稀土正铁氧体Sm_0.8Tb_0.2FeO₃单晶的生长及性能

Crystal Growth and Characterization of the Rare-earth Orthoferrite Sm_0.8Tb_0.2FeO₃Single Crystal

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