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Magnetovolume Effect in Fe-Ni Invar Alloys below and above the Curie Temperature

1981; Physical Society of Japan; Volume: 50; Issue: 7 Linguagem: Inglês

10.1143/jpsj.50.2231

1347-4073

Fumihisa Ono,

Microstructure and Mechanical Properties of Steels

A detailed comparison of the thermal expansion coefficient in Fe-Ni Invar alloys with the results of magnetization measurements has been made in a wide temperature range both below and above the Curie temperatures. A new method of determining the lattice term from the observed thermal expansion coefficient has been proposed and applied to the estimation of the magnetic contribution to the thermal expansion coefficient. It has been found that the magnetic contribution below the Curie temperature is well expressed with the factor M d M /d T and that it is proportional to dχ -1 /d T above the Curie temperature. These results can well be explained by the spin fluctuation theory developed by Moriya and Usami.