制备了YMn6Sn6-xGax(x=0.3，0.6，0.9，1.2，1.5，1.8)和YMn6Sn6-xTix(x=0，0.2，0.4，0.6，0.8，1.0)化合物，通过X射线衍射和磁性测量手段对其结构和磁性进行了研究，实验表明，所有这些化合物均为CaCu5型六方结构。对YMn6Sn6-xGax研究表明，晶格参数和晶胞体积均随Ga含量的增加而线性减小，磁性测量表明：当x≥0.3时，化合物由反铁磁性转变为铁磁性或亚铁磁性，随Ga含量增加，该化合物的居里温度先增高，在x=0.6达到最大值，然后居里温度又逐渐降低。饱和磁化强度开始随Ga含量的增加而增大 ，当x＞1.2时，随Ga含量的增加而减小。对YMn6Sn6-xTix研究表明，晶格参数和晶胞体积均随Ti含量的增加而线性增大，磁性测量表明，当x≥0.6时，化合物由反铁磁性转变为铁磁性或亚铁磁性，随Ti含量增加居里温度(或奈耳温度)呈线性下降，饱和磁化强度开始随Ti含量的增加而增大，当x＞0.6时，随Ti含量的增加而减小。
The crystal structure,magnetic structure,magnetic parameter of YMn6Sn6-xMx(M=Ga,Ti)compounds prepared by vacuum arc fur nace have been studied in this article.All these compounds have the CaCu5 type structure.The experimental results show that the antiferromagnetic structure of YMn6Sn6 is very unstable.Increasing or decreasing of the crystal volume re sults in transferring from the antiferromagnetic structure to the ferromagnetic structure.
参考文献
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