钙钛矿型复合氧化物La_(1-x)Sr_xMnO_3和(La_(0.7)Sr_(0.3))_(1-y)K_yMnO_3的结构及磁性研究  

Structure and Magnetism of Perovskite-type Composite Oxides La_(1-x)Sr_xMnO_3 and (La_(0.7)Sr_(0.3))_(1-y)K_yMnO_3

作　　者：亓淑艳 郭丽琴[1] 冯静 石兆辉 张密林[1] 宁兆娟[1] 

机构地区：[1]哈尔滨工程大学化工学院,黑龙江哈尔滨150001

出　　处：《稀土》2008年第1期23-27,共5页Chinese Rare Earths

基　　金：哈尔滨工程大学基础研究基金项目资助(HEUFT05019);教育部博士学科点专项基金(20050217019)

摘　　要：采用溶胶-凝胶法制备了钙钛矿型La1-xSrxMnO3和(La0.7Sr0.3)1-yKyMnO3粉体,研究了溶胶-凝胶法合成条件对样品的比饱和磁化强度的影响。利用XRD对样品结构进行表征,结果表明,Sr的掺入量不影响La1-xSrxMnO3结构,(La0.7Sr0.3)1-yKyMnO3系列样品由于K+的半径与La3+,Sr2+不匹配,掺杂浓度仅为0.01就已经出现杂相峰,超过0.1时杂峰增多。通过振动样品磁强计测试样品的磁性质,结果表明,x≤0.3的范围内La1-xSrxMnO3系列样品的比饱和磁化强度随着x的增加而增加,当x>0.3后随x的增加而减弱,(La0.7Sr0.3)1-yKyMnO3系列样品的比饱和磁化强度随y的增加而下降。La1-xSrxMnO3和（La0.7Sr0.3）1-yKyMnO3 powders with perovskite structure were prepared by solgel tectmiques. The effects of synthesis condition on the saturated magnetization were studied.The structure of powder was charactefized by x- ray diffraction. It shows that La1-xSrx MnO3 structure was not affected by different Sr content. While the （La0.7Sr0.3）1-yKyMnO3 just can keep pure phase when y 〈 0.01 due to the dismatch radius between K^＋ and La^3＋ , Sr^2＋, The magnetic properties were measured by VSM. It shows that when x 〈 0.3 the saturated magnetization of La1-xSrx MnO3 powders enhanced with the increase in dopant content x,while the saturated magnetization of （La0.7Sr0.3）1-yKyMnO3 powders descended with y.

关 键 词：溶胶-凝胶法 钙钛矿 比饱和磁化强度 

分 类 号：O482.5[理学—固体物理] O614.33[理学—物理]