TL;DRAbstract
We present results of experimental studies of magnetic properties and phase transitions in a new class of smart materials, ferromagnetic shape memory alloys Ni2+xMn1−x Ga. The phase diagram of these alloys was determined from magnetic, transport and calorimetric measurements in the concentration interval 0 ≤ x ≤ 0.36. These measurements revealed a general tendency of the Curie temperature T c to decrease and of the martensitic transformation temperature T m to increase upon substitution of Mn for Ni. This tendency leads to the occurrence of three characteristic compositional intervals in which (i) a martensitic transformation occurs in the ferromagnetic matrix (T m < T c ), (ii) a first-order magnetostructural phase transition from ferromagnetic martensite ↔ to paramagnetic austenite takes place at T m ≈ T c , and (iii) a martensitic transformation occurs in the paramagnetic state when (T m > T c ).
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We present results of experimental studies of magnetic properties and phase transitions in a new class of smart materials, ferromagnetic shape memory alloys Ni2+xMn1−x Ga. The phase diagram of these alloys was determined from magnetic, transport and calorimetric measurements in the concentration interval 0 ≤ x ≤ 0.36. These measurements revealed a general tendency of the Curie temperature T c to decrease and of the martensitic transformation temperature T m to increase upon substitution of Mn for Ni. This tendency leads to the occurrence of three characteristic compositional intervals in which (i) a martensitic transformation occurs in the ferromagnetic matrix (T m < T c ), (ii) a first-order magnetostructural phase transition from ferromagnetic martensite ↔ to paramagnetic austenite takes place at T m ≈ T c , and (iii) a martensitic transformation occurs in the paramagnetic state when (T m > T c ).
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