Magnetic Susceptibility and NMR Studies of XAI-Type Intermetallic Compounds (X=Ni, Co and Fe)
Magnetic Susceptibility and NMR Studies of XAI-Type Intermetallic Compounds (X=Ni, Co and Fe)
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DOI：
10.1143/jpsj.25.1008
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发表时间：
1968-10
影响因子：
1.7
通讯作者：
K. Miyatani;S. Iida
中科院分区：
文献类型：
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作者：
K. Miyatani;S. Iida
研究了CsCl型Ni-Al、Co-Al和Fe-Al金属间化合物中Al 27和Co 59的磁化率和核磁共振谱。Fe-Al和富钴Co-Al化合物的顺磁性为Curie-Weiss型，富铝Co-Al和所有Ni-Al化合物的顺磁性为Pauli型。在Fe-Al系中观察到Al 27的负Knight位移与温度无关。Fe-Al和Co-Al化合物中，随着Al含量的减少，谱线宽度增加，出现Curie-Weiss型顺磁性。谱线强度在化学计量比XAl处有一个极大值，由于四极相互作用的影响，谱线强度向两侧急剧下降。所有结果都在能带模型的基础上进行了讨论。结果表明，过量的Co和Fe原子形成小团簇，使磁化率和谱线增宽正增长，富Al侧Ni和Co位的空位形成小团簇。
Magnetic susceptibility and nuclear magnetic resonance of Al 27 and Co 59 were studied for Ni-Al, Co-Al, and Fe-Al intermetallic compounds with CsCl-type structure. Curie-Weiss type paramagnetism was observed for the Fe-Al and cobalt rich Co-Al compounds, and Pauli type paramagnetism was observed for the Al rich Co-Al and all Ni-Al compounds. A temperature independent negative Knight shift of Al 27 was observed in the Fe-Al system. The line width increases in the Fe-Al and Co-Al compounds when Al content decreases and Curie-Weiss type paramagnetism appears. The line intensity shows a sharp maximum at the stoichiometric composition XAl, and decreases steeply to the both sides due to the effects of quadrupole interactions. All the results have been discussed based on the band model. It is concluded that the excess Co and Fe atoms make small clusters to which the positive increase in the susceptibility and the line broadening are attributed, and that the vacancies at the Ni and Co sites in the Al-rich sides ...