摘要
采用两种不同的方法制备了不同稀土含量的（Ｌａ１－ ｘ Ｒｘ）２／３Ｓｒ１／３ ＭｎＯ３（ Ｒ＝ Ｓｍ ，Ｔｂ） 大块多晶样品，并研究了它们的晶体结构及室温下的磁致伸缩效应．分析表明，随Ｓｍ ，Ｔｂ 对Ｌａ 的替代，样品的晶体结构从菱面体相转变为正交相．在结构相转变点附近，样品在室温下的磁致伸缩效应出现极大值．样品在室温下的磁致伸缩主要来源于材料中的交换磁致伸缩．
A series of polycrystaline bulk (La 1-x ?R\-x ) 2/3 Sr 1/3 MnO\-3( R =Sm,Tb) over a wide composition range were prepared by two different techniques,and their structure and magnetostriction effect were studied carefully at room temperature.The X\|ray diffraction pattern indicated that the structure of samples transformed from rhombohedral type to orthorhombic phase with decreasing R contents.The sample,composition near the transformation point,had the maximum value of magnetostriction.The magnetostriction may come from the exchange magnetostriction in the samples at room temperature.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第S1期268-273,共6页
Acta Physica Sinica
基金
国家自然科学基金!( 批准号:19974032)
