SrFe_(1-x)Cu_xO_2氧化物的晶体结构和磁性能  

Crystal structure and magnetic properties of oxides SrFe_(1-x)Cu_xO_2

作　　者：彭国令 董存军[1] 买吾兰.江热合曼 聂耀庄[1] 郭光华[1] 

机构地区：[1]中南大学物理与电子学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2016年第1期160-165,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(11374373);教育部博士点基金资助项目(20120162110020);湖南省自然科学基金资助项目(13JJ2004)

摘　　要：采用溶胶凝胶法制备SrFe1-xCuxO3-δ多晶化合物,然后低温还原制备一系列掺Cu的Sr Fe O2氧化物,即Sr Fe1-xCuxO2(0≤x≤0.2)氧化物,对该氧化物的晶体结构和磁性能进行研究。X线衍射以及Rietveld结构精修分析结果表明:SrFeO2氧化物为层状的四方晶体结构,空间点群为P4/mmm。Fe位掺Cu不会改变化合物的晶体结构,Cu原子完全占据Fe原子点阵位置。Sr Fe O2具有反铁磁性,奈尔温度为533 K,Fe离子的有效磁矩为4.6mB。低温区,x=0和0.1的化合物中还观察到新的磁相变。根据分子场理论,Sr Fe O2和Sr Fe0.9Cu0.1O2反铁磁交换作用的分子场系数分别为862和892。Sr Fe1-xCux O2（0≤x≤0.2） polycrystalline samples were prepared by using low temperature topochemical method. The crystal structure and magnetic properties of the oxides were studied. The results of XRD and Rietveld structure finishing analysis show that Sr Fe O2 has infinite layer tetragonal structure with the space group P4/mmm and the Cu doped compounds keep the same structure. The Cu atoms occupy the Fe sites totally. The magnetic measurements show that Sr Fe O2 is an antiferromagnet with Neél temperature 533 K. The effective magnetic moment of Fe ion is 4.6？B. In the low temperature range, another magnetic transition is observed in the oxides with x=0 and 0.1. The molecular coefficient of the antiferromagnetic exchange interaction is estimated to be 862 for Sr Fe O2 and 892 for Sr Fe0.9Cu0.1O2 according to the molecular field theory.

关 键 词：金属氧化物 晶体结构 磁学性质 磁相度 分子场理论 

分 类 号：O482.5[理学—固体物理]