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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
引用本文:刘宪瑞,侯长民,袁龙,刘绍孔,秦圆圆,黄科科,冯守华.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[J].高等学校化学学报,2013,34(2):277-283.
作者姓名:刘宪瑞  侯长民  袁龙  刘绍孔  秦圆圆  黄科科  冯守华
作者单位:吉林大学化学学院无机合成与制备化学国家重点实验室
基金项目:国家自然科学基金(批准号:90922034,21131002);高等学校博士学科点专项科研基金(批准号:20110061130005)资助
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.Mssbauer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  Mssbauer谱
收稿时间:2012-04-18

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.Hydrothermal Synthesis and Ferrimagnetism of Nd3-xSrxFe5O12(0.2≤x≤0.8) Substituted Garnets[J].Chemical Research In Chinese Universities,2013,34(2):277-283.
Authors:LIU Xian-Rui  HOU Chang-Min  YUAN Long  LIU Shao-Kong  QIN Yuan-Yuan  HUANG Ke-Ke  FENG Shou-Hua
Institution:(State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry, Jilin University,Changchun 130012,China)
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.
Keywords:Substituted garnet  Hydrothermal synthesis  Ferrimagnetism    ssbauer spectroscopy
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