1989 Volume 53 Issue 1 Pages 143-148
The thermal expansion and magnetization of Mn-22%Ge based ternary alloys containing a element such as Cd or In which belongs to B group in the periodic table were measured in the air-quenching or water-quenching state after homogenizing at 1100 K for 10.8 ks. The crystal structures were compared with those of the basic binary alloy.
The concentration region of Cd or In in the ternary alloys showing the ε single phase is spread to about 6%, and the area is equal to that of the alloys with Fe. The Néel point TN(ε) shows a slightly higher value than that of the binary alloy. The characteristic thermomagnetic property shown in the binary alloys remains in the ternary alloys. The phase transformation from ε to ε1 can hardly progress in the ternary alloys, too. It means that the ε phase of the ternary alloys once obtained is stable in the vicinity of room temperature. The thermal expansion coefficient of the binary alloys is reduced by additions of Cd or In. It is thought that the concentration showing a minimum coefficient of the thermal expansion shows border of the ε single phase. Cd and In are the elements useful in spreading out the Invar region of the Mn-Ge alloy.
