摘要
通过X射线衍射和磁测量手段研究Tm2CrFe16-xSix(x.=.0,0.5,1.0,1.5,2.0,2.5,3.0)化合物的结构和居里温度.结果表明,Tm2CrFe16-xSix化合物具有Th2Ni17型结构,随着Si替代量x的增加,Tm2CrFe16-xSix化合物的单胞体积、晶胞参数都减小.在Tm2CrFe16-xSix化合物中存在着各向异性的磁弹耦合效应.随着x的增加,Tm2CrFe16-xSix化合物的居里温度升高,在x.=1.5时达到最大值,约为450.K,比Tm2Fe17化合物的居里温度高出约140.K,当x继续增加时,Tm2CrFe16-xSix化合物的居里温度下降.
The crystal structure property and the Curie temperature of Tm2CrFe16-xSix（x=0,0.5,1.0,1.5,2.0,2.5, 3.0） compounds have been investigated by means of X-ray diffraction and magnetization measurements. These compounds have Th2Ni17-type structure. The unit-cell volume and the unit-cell parameters a and c decrease with increasing x. The result of analysis shows there is an anisotropy magneto-elastic effect in Tm2CrFe16-xSix compounds. The Curie temperature Tc of Tm2CrFe16-xSix compound increase with increasing x first,then decrease with further increasing x,the maximum value of Tc is about 450 K forx=1.5. This value is about 140 K greater than that of the mother compound Tm2Fe17.
出处
《天津科技大学学报》
CAS
2009年第5期32-35,共4页
Journal of Tianjin University of Science & Technology
基金
国家自然科学基金资助项目(50871074)
天津科技大学科学研究基金资助项目(20080210)
