Abstract
We present the effect of substitution-induced pressure on the reversibility of the magnetocaloric effect (MCE) in (, 0.2, 0.3) alloys, through characterization in pulsed magnetic fields. We measured the adiabatic temperature change directly during applied magnetic field pulses of 2 and 6 T. We paid special attention to the reversibility of . The substitution of Mn by Cr in leads to a negative pressure, as evidence by the increase of the lattice parameters, which shifts the martensitic transition towards lower temperatures and enhances the ferromagnetism of the martensite phase. We found a large value of K at K for the sample with for a field change of 6 T. We discuss the reversibility of the MCE in these alloys in terms of the Clausius-Clapeyron equation.
- Received 28 May 2021
- Revised 19 August 2021
- Accepted 29 September 2021
DOI:https://doi.org/10.1103/PhysRevMaterials.5.104406
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