高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (2): 277.doi: 10.7503/cjcu20120370

• 研究论文: 无机化学 • 上一篇    下一篇

取代石榴石型铁氧体Nd3-xSrxFe5O12(0.2≤x≤0.8)的水热合成与磁性研究

刘宪瑞, 侯长民, 袁龙, 刘绍孔, 秦圆圆, 黄科科, 冯守华   

  1. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012
  • 收稿日期:2012-04-18 出版日期:2013-02-10 发布日期:2013-01-21
  • 通讯作者: 黄科科,男,博士,讲师,主要从事无机固体材料研究.E-mail:kkhuang@jlu.edu.cn E-mail:kkhuang@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 90922034, 21131002)和高等学校博士学科点专项科研基金(批准号: 20110061130005)资助.

Hydrothermal Synthesis and Ferrimagnetism of Nd3-xSrxFe5O12(0.2≤x≤0.8) Substituted Garnets

LIU Xian-Rui, HOU Chang-Min, YUAN Long, LIU Shao-Kong, QIN Yuan-Yuan, HUANG Ke-Ke, FENG Shou-Hua   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2012-04-18 Online:2013-02-10 Published:2013-01-21

摘要:

通过水热合成得到石榴石型铁氧体材料Nd3-xSrxFe5O12(x=0.2, 0.4, 0.6, 0.8), 经X射线粉末衍射分析确定样品属于立方晶系, Ia3d空间群, 晶格常数a>1.2600 nm. Mössbauer谱数据显示Sr2+离子和Nd3+离子共同占据十二面体C位, 晶格中有少量Fe4+离子生成. 通过扫描电子显微镜观察到样品晶粒为菱形十二面体. 高温M-T曲线和磁滞回线表明, 4个样品的居里温度均在570 K左右, 不因Sr2+离子含量不同而改变; 但是随着Sr2+离子在晶格中含量的增加, 样品的饱和磁化强度(Ms)下降, 矫顽力(Hc)增大.

关键词: 取代石榴石, 水热合成, 亚铁磁性, Mö, ssbauer谱

Abstract:

Nd3-xSrxFe5O12(x=0.2, 0.4, 0.6, 0.8) crystals, which are of cubic structure with the space group of Ia3d and lattice constants over 1.2600 nm, were synthesized using the hydrothermal method. Mössbauer spectroscopy demonstrates the coexistence of Sr2+ and Nd3+ at the C sites of the dodecahedrons. The crystals also appear dodecahedrons with similar sizes as can be seen from the scanning electron microscopy(SEM) images. By recording the magnetic hysteresis loops and M-T curves at high temperature, we find that with the x increasing, saturation magnetization values decrease while the coercive forces go up. The Curie temperature of all the samples remain almost unchanged, namely 570 K, regardless of the x variation.

Key words: Substituted garnet, Hydrothermal synthesis, Ferrimagnetism, Mö, ssbauer spectroscopy

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