Mn-Ge系反強磁性インバー型合金の諸特性におよぼす遷移金属の影響

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タイトル別名
  • The Influence of Transition Metals on the Properties of Antiferromagnetic Invar-Type Mn-Ge Alloys
  • Mn Geケイ ハン キョウジセイ インバーカタ ゴウキン ノ ショ トクセイ

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The magnetic properties, thermal expansion, lattice constants, hardness and workability of Mn-22%Ge based ε phase ternary alloys containing transition metal in group IV, V or VI of the periodic table were measured in the state cooled at various rates after homogenizing at 1100 K for 10.8 ks.<BR>The magnetization of Mn-22%Ge based ternary alloys shows almost the same temperature variation as that of the binary alloy and an abrupt decrease near the Néel point TN. The ternary alloys also indicate a minimum in the electrical resistivity at TN. The Néel point of the ε phase shifts to the lower temperature side with an increase in the concentration of the third element. The transformation from ε to ε1 does not occur easily by addition of the third element, keeping the nature of the binary alloy system.<BR>In the thermal expansion curves of Mn-22%Ge based ternary alloys there appears a minimum point corresponding to the Néel point of the ε phase, showing the Invar characteristics. The thermal expansion coefficients in the vicinity of room temperature of the ternary alloys decrease at first from the value of binary alloy with increase of the third elements and increase the positive value after passing through a zero or small negative minimum value. The spontaneous volume magnetostriction of a Mn-22%Ge-4%Cr alloy at 77 K is 1.3×10−2 and the value is less affected by addition of a few percents of Cr. The Vickers hardness of the ternary alloys shows the smaller value than that of Mn-Ge binary alloy.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 48 (4), 442-447, 1984

    公益社団法人 日本金属学会

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