Fe—40Al及其含Mn或Ti合金的Mossbauer谱

MOSSBAUER STUDY ON B2 INTERMETALLIC COMPOUND Fe-40A1 AND ITS Mn OR Ti CONTAINING ALLOYS

用Ｍｏｓｓｂａｕｅｒ谱研究了Ｂ２结构金属间化合物Ｆｅ－４０Ａｌ及其加Ｍｎ或Ｔｉ量分别为１，５，１０ａｔ．－％的合金．在室温下，Ｆｅ－４０Ａｌ及其合金的Ｍｏｓｓｂａｕｅｒ谱均接近单峰谱线，Ｆｅ原子无明显磁矩对加入第三组元的Ｆｅ—４０Ａｌ合金的Ｍｏｓｓｂａｕｅｒ谱用最小二乘法拟合为两条洛仑兹曲线之和，认为Ｍｎ原子既占据Ｆｅ原子位置，也占据Ａｌ原子位置；而Ｔｉ原子优先占据Ｆｅ原子位置，超过５ａｔ．－％时，才有少量Ｔｉ原子占据Ａｌ原子位置．

Mossbauer measurements at room temperature have been carried out on the B2 intermetallic compound Fe-40A1 and its Mn or Ti containing alloys.The reults show that all the Mossbauer spectra of Fe-40A1 and its Mn or Ti containing alloys are approximately one-peak singlets. The Fe atoms in these alloys show no significant magnetic moment. The spetra of Mn or Ti containing alloys have been fitted with two Lorentzian lines by the method of least squares.By studying the isomer shifts and other parameters of these fitted lines, it has been shown that Mn atoms occupy both Fe and A1 sublattices, Ti atoms occupy preferentially Fe sublattice, however, a few of Ti atoms occupy A1 sublattice only as Ti concentration is over certain amount(～5at.-%).