Journal
PHILOSOPHICAL MAGAZINE
Volume 90, Issue 20, Pages 2771-2792Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786431003745393
Keywords
magnetic shape memory alloys; Ni2MnGa; phase transitions; phase diagrams
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Funding
- CICyT (Spain) [MAT2007-61200]
- CONACYT [44786-SEP-CONACYT 2003]
- Comissionat per a Universitats i Recerca (CUR) del Departament d'Innovacio, Universitats i Empresa de la Generalitat de Catalunya
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We studied the effect of selective substitution in Fe and Co 3d elements on the structural and magnetic phase transitions in the prototypical magnetic shape memory alloy Ni-Mn-Ga. We determined the phase diagram for each elemental doping substitution by means of calorimetry and ac susceptibility measurements. An effort was made to substitute each constituent element by the same amounts of doping and to study the role of parameters other than electronic concentration in controlling phase stability. Specifically, selective doping with atoms of similar atomic radii but different magnetic properties allowed us to investigate the role of magnetic interactions on the relative phase stability of the ternary compound. We determined the entropy change associated with the martensitic transition for each quaternary alloy to obtain further information on the effect of magnetism on the relative stability of the involved phases exhibited by these compounds.
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