Lattice and spin entropy changes in B2-type magnetocaloric Al–Mn–Ni alloy
Year: 2024
Type: article
Abstract: Understanding the electronic, lattice, and magnetic contributions to the magnetocaloric effect in magnetic materials can help to elucidate and optimize their performance. In this work, the structural and magnetocaloric properties of Al–Mn–Ni alloy are experimentally determined and theoretically analyzed based on ab initio calculations. The dominating B2 phase associated with the Mn-rich sublattice is found to be responsible for the observed magnetocaloric properties. The magnetic entropy change, refrigerant capacity, and adiabatic temperature change are evaluated. Through the analysis of the data, we find that for the B2 phase, changing from ferromagnetic to paramagnetic configurations results in a pronounced elastic hardening despite the volume expansion. The decrease in lattice entropy is significant and contributes negatively to the magnetic and electronic entropy changes. Our work emphasizes the critical role of the lattice sector in the magnetocaloric effect, and provides an in-depth understanding of the individual entropy terms in magnetic solid solutions.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,165
Awards: G2061701933, Surface properties of high-technology materials from first-principles, G3321450376, G5343605334, Future Materials Design (SuperFraMat), G712881263, Multicomponent alloy hydrides: finding next generation hydrogen storage materials by theory, G796431723, High Entropy Alloys for Advanced Reactor Applications (HERA)
OpenAlex ID: W4404581722