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SmFe_(10-x)Co_xTi系列化合物的晶位及性质研究

张道元 , 熊曹水 , 孙天富 , 王征 , 黄美清

金属学报

利用Mossbauer谱,磁测量技术对稀土合金SmFe_(10-x)Co_xTi系列的晶位及性质进行研究,实验分析表明,Fe被少量Co替代后,Co原子优先进入8f晶位;Co取代Fe明显提高化合物的Curie温度,饱和磁化强度与Fe的超精细物随Co的增多有类似的变化曲线,均在Co含量x=2处达到极大值。这主要由于掺入的Co影响了合金原子的交换作用,导致合金Curie温度上升。

关键词: Mossbauer效应 , crystallographic site , hyperfine field , exchange interaction

The Mssbauer Effect of Y-Ba-Cu-Fe-O Superconductive Oxide

XIA Sike , MA Ruzhang , CAO Guohui , LI Zhengwen , FENG Yongrong University of Science and Technology , Beijing , China. To whom correspondence should be addressed.

材料科学技术（英文）

We have studied the Mossbauer effect of YBa_2Cu_(2.88)Fe_(0.12)O_(7-x) superconductive oxide from 78 to 273K. Two minima of recoilless fraction and Debye temperature were found near 110K and 220K. It means that lattice softening happened near these two temperatures. We also observed minima of isomer shift near 110K and quadrupole splitting increase when temperature is lower than 110K. We suggest that lattice softening would lead to the displacement of oxygen atoms. This may be relative to superconductive transition.

关键词: Y-Ba-Cu-Fe-O superconductor , null , null

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