日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 11 (1976),
pp. 1131-1134

Invar Characteristics in (Mn1-xCrx)B and (Mn1-xFex)B

Toshihiko Shigematsu1, Tadahito Kanaizuka2 and Sukeji Kachi1

1Faculty of Science, Kyoto University, Kyoto
2Graduate School, Kyoto University, Kyoto

Abstract:

Thermal expansivity measurements were made on polycrystalline sintered (Mn1-xCrx)B and (Mn1-xFex)B. These compounds show an anomalous thermal expansivity, similar to that of the invar alloys. Near the Curie temperature MnB shows a steep descent in the thermal expansivity curve, leading to a large negative thermal expansion coefficient. With the addition of Cr, the thermal expansion coefficient below the Curie temperature becomes smaller. The mean thermal expansion coefficient of (Mn0.88Cr0.12)B from 100 K to 500 K is about 1×10-6 deg-1. This anomaly is explained as being a result of a large spontaneous volume magnetostriction. Magnetovolume effect of these materials are discussed on the basis of the band model of ferromagnetism.


(Received 1976/03/5)

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