Journal of Applied Physics · 2008 · 96 citations · 12 references
Materials ScienceMagnetismMagnetic PropertiesMaterials EngineeringHigh Temperature MaterialsEngineeringPyrochlore MagnetsApplied PhysicsHeusler Alloy Ni50mn37sn13Alloy DesignAlloy PhaseMagnetic MaterialRibbon PlaneMelt SpinningMicrostructure
The Heusler alloy Ni50Mn37Sn13 was successfully produced as ribbon flakes of thickness around 7–10μm melt spinning. Fracture cross section micrographs in the ribbon show the formation of a microcrystalline columnarlike microstructure, with their longer axes perpendicular to the ribbon plane. Phase transition temperatures of the martensite-austenite transformation were found to be MS=218K, Mf=207K, AS=224K, and Af=232K; the thermal hysteresis of the transformation is 15K. Ferromagnetic L21 bcc austenite phase shows a Curie point of 313K, with cell parameter a=0.5971(5)nm at 298K, transforming into a modulated 7M orthorhombic martensite with a=0.6121(7)nm, b=0.6058(8)nm, and c=0.5660(2)nm, at 150K.
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Inverse magnetocaloric effect in ferromagnetic Ni–Mn–Sn alloys
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