<報文>急冷凝固 Ni_2MnGa 薄帯の評価

概要

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Ferromagnetic material Ni_2MnGa has Hesler type cubic ordered crystal structure at room temperature and transforms to martensitite phase of Heusler type tetragonal strucutre by cooling. In order to invesitigate the effect of the atomic arrangement, the rapidly solidified stoichiometric Ni_2MnGa was prepared by the melt spining method using the single roll. The surfaces were observed by the scanning electron microscope and the composition was determined by the electron probe microanalysis and X-ray diffraction was performed in order to study the crystal structure. The good crystallinity was obtained on this rapidly solidified specimen. From the measurement of the differential scanning calorimeter and the temperature change of the X-ray diffraction patterns, the transformation temperatures, Ms, Mf, As and Af, were determined as 120,90,125 and 150K, respectively. The Curie temperature was 349K.Ni_2MnGaphase transformationferromagnetismrapid solidification
東北大学の論文
1998-03-27