Magnetization, Thermal Expansion and Low Temperature Specific Heat of Fe_<72>Pt_<28> Invar Alloy

概要

論文の詳細を見る
In order to clarify the effect of concentration fluctuation on the Invar effect, the temperature dependences of magnetization and thermal expansion and the low temperature specific heat of the Fe_<72>Pt_<28> alloy were measured in both the ordered and disordered states. The thermal expansion anomaly, which is the most essential Invar effect, was observed in both states of the alloy. This anomaly is more remarkable in the disordered state than in the ordered state, particularly around T_c. This different behavior can be attributable to the difference in the magnetization versus temperaturre curve; the magnetization of the disordered alloy decreases more rapidy around T_c. The spontaneous volume magnetostriction at 0 K were estimated for the ordered and disordered states as 1.4×10^<-2> and 1.6×10^<-2>, respectively. These phenomena can not be explained by the proposed models for the Invar effect based on the inhomogeneity or the fluctuation of composition.
社団法人日本物理学会の論文
1976-04-15