Antiferromagnetic Characteristics of Cr-Fe-Sn Invar Alloys

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  • Cr-Sn, Cr-Fe系合金の反強磁性と非強磁性Cr-Fe-Snインバー合金
  • Cr-Sn , Cr-Feケイ ゴウキン ノ ハン キョウジセイ ト ヒキョウジセイ Cr-Fe-Sn インバー ゴウキン

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Invar alloys are widely used as materials for precision instruments. The practical Invar alloys are all ferromagnetic, and the ferromagnetism of these alloys often limits the scope of their applications. In recent years, therefore, considerable attention has been directed to the research and development of nonferromagnetic Invar alloys.<BR>Cr is antiferromagnetic material and its physical properties such as thermal expansivity and electrical resistivity change anomalously near the Néel temperature. These properties are sensibly modified by the addition of other elements. The present authors investigated the temperature dependence of the physical properties for some Cr-base primary solid solution alloys. With the addition of Sn, the Néel temperature of Cr increases up to 2.0% Sn and then decreases gradually. And the thermal expansion coefficient below the Néel temperature becomes smaller. The Néel temperature in the Cr-Fe system decreases with increasing Fe concentration, and the temperature dependence of the thermal expansivity is irregular.<BR>Taking the above-mentioned results into consideration, the thermal expansivity and the magnetic susceptibility of the Cr-Fe-Sn alloys in the range of the primary solid solution have been measured. The results show that the alloys are of the antiferromagnetic Invar type and their susceptibility is negligibly small.

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