A simultaneous magnetic and structural transition is found for Ni2+xMn1xGa at 0:18pxp0:2: The existence of a composition range for observing the co-occurrent transition and the composition dependence of the critical temperatures are discussed in the light of the expected difference between the Curie temperatures of the austenitic and martensitic phases. A giant magnetic entropychange is deduced for the three samples, with a maximum value of the order of jDSmj ¼ 15 J/kgK for a field span of 1.8 T.
Composition dependence of magnetic and magnetothermal properties of Ni–Mn–Ga shape memory alloys
CANEPA, FABIO MICHELE;CIRAFICI, SALVINO;FRANCESCHI, ENRICO;NAPOLETANO, MYRTA;
2004-01-01
Abstract
A simultaneous magnetic and structural transition is found for Ni2+xMn1xGa at 0:18pxp0:2: The existence of a composition range for observing the co-occurrent transition and the composition dependence of the critical temperatures are discussed in the light of the expected difference between the Curie temperatures of the austenitic and martensitic phases. A giant magnetic entropychange is deduced for the three samples, with a maximum value of the order of jDSmj ¼ 15 J/kgK for a field span of 1.8 T.
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