Abstract
The structural, magnetic, and transport properties of the Ni49.5Ti48Ir2.5 alloy have been presented. The alloy is formed in the B2-type phase with a small amount of Ti2NiIr as an additional phase. In the DSC curve, two distinct peaks are observed on heating and cooling. These peaks correspond to the martensitic transformations from the B2 to the R phase and from the R to the B19 ′ phase on cooling and a reverse transformation from the B19 ′ to the R to the B2 phase on heating, respectively. From the resistivity curve, the martensitic start (M S), martensitic finish (M f), austenite start (A S), and austenite finish (A f) temperatures are found to be 211, 170, 273, and 298 K, respectively. In the magnetization-versus-temperature (M–T) curve, no evidence of the ferromagnetic ordering temperature is observed. However, the magnetization-versus-field (M–H) curves at 5 and 300 K show existence of ferromagnetic order in the alloy.
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