Martensitic transformation, thermal analysis and magnetocaloric properties of Ni-Mn-Sn-Pd alloys
Martensitic transition and magnetic response of Ni50-x Pdx,y Mn36 Sn14-y (x = 0, 1, 2 and y = 0, 1) Heusler alloys were analysed. The crystalline structure of each composition was solved by X-ray diffraction pattern fitting. For x = 1 and 2, the L21 austenite structure is formed and, for y = 1, the...
| Autores: | , , , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2020 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/340001 |
| Acesso em linha: | https://hdl.handle.net/2117/340001 https://dx.doi.org/10.3390/pr8121582 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Adiabatic demagnetization Magnetic materials Magneto-structural transition Heusler alloys martensitic transition magnetocaloric effect entropic change Materials magnètics Àrees temàtiques de la UPC::Física::Electromagnetisme::Magnetisme |
| Resumo: | Martensitic transition and magnetic response of Ni50-x Pdx,y Mn36 Sn14-y (x = 0, 1, 2 and y = 0, 1) Heusler alloys were analysed. The crystalline structure of each composition was solved by X-ray diffraction pattern fitting. For x = 1 and 2, the L21 austenite structure is formed and, for y = 1, the crystallographic phase is a modulated martensitic structure. From differential scanning calorimetry scans, we determine characteristic transformation temperatures and the entropy/enthalpy changes. The temperatures of the structural transformation increase with the addition of Pd to replace Ni or Sn, whereas the austenitic Curie temperature remains almost unvarying. In addition, the magneto-structural transition, investigated by magnetic measurements, is adjusted by suitable Pd doping in the alloys. The peak value of the magnetic entropy changes reached 4.5 J/(kg K) for Ni50Mn36Sn13Pd1 (external field: 50 kOe). |
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