Y_2(Fe_(1-x)Ga_x)17化合物的Mssbauer效应研究

MSSBAUER EFFECT STUDIES OF Y 2(Fe 1- x Ga x ) 17 COMPOUNDS

用穆斯堡尔效应研究了Ｙ２Ｆｅ１７化合物中，用Ｇａ取代部分Ｆｅ之后，材料的性质变化规律．实验结果表明，在Ｙ２（Ｆｅ１－ｘＧａｘ）１７中，其结构随ｘ的增加发生从Ｔｈ２Ｎｉ１７相到Ｔｈ２Ｚｎ１７相的转变；晶格常数随ｘ的增加而增加；居里温度，超精细场都在Ｔｈ２Ｎｉ１７，Ｔｈ２Ｚｎ１７混和相附近有极大值；Ｇａ原子优先取代１２ｋ（１８ｈ）晶位Ｆｅ原子．

In this paper Mossbauer effect is used to investigate the variation of the properties of Y 2Fe 17 when some Ga atoms are in the place of Fe atoms.Results of experiment show that Y 2(Fe 1- x Ga x ) 17 turns from the Th 2Ni 17 composition to the Th 2Zn 17 composition according to the increase of x .Curie temperature and hyperfine field both have maximum when both compositions coexist.Furthermore,lattice parameters increase and Ga takes the place of 12k(18h) in preference.