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.Mssbauer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.
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.Mssbauer 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第2期277-283,共7页
Chemical Journal of Chinese Universities
基金
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
