2026-04-17T18:37:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/188452024-06-18T11:51:06Zcom_2072_452955com_2072_2054col_2072_453063

2024-06-18T11:51:06Z urn:hdl:10256/18845 Structure, Magnetocaloric Effect and Critical Behaviour in Ni 50 Mn 30 (Sn, In) 20 Heusler Alloys Dadda, Karima Alleg, Safia Suñol Martínez, Joan Josep Bessais, Lotfi Hill, El-Kebir Metalls -- Aliatges Metals -- Alloys Raigs X -- Difracció X-rays -- Diffraction Aliatges Alloys Aliatges amb memòria de forma Shape memory alloys A detailed investigation of structure, critical behaviour and magnetocaloric properties of Ni50Mn30Sn20 (Sn20) and Ni50Mn30In20 (In20) alloys has been investigated by means of X-ray diffraction and magnetic measurements. Ni50Mn30Sn20 alloy shows a cubic austenite L21 structure and undergoes a second order magnetic transition at a Curie temperature of TAc,1(Sn20)=333 K. However, the Ni50Mn30In20 alloy exhibits a mixture of cubic L21 and B2 austenite structures having Curie temperatures of TAc,2(In20)=285 K and T∗c(In20)=330 K, respectively. The modified Arrott plots, Kouvel-Fisher curves and critical isotherm analysis have been used to estimate the critical exponents (β, γ and δ) around the Curie temperature. For Sn20 alloy, the reliable exponents are consistent with the mean field model, revealing long-range ferromagnetic interactions. Nevertheless, the critical exponents of In20 alloy around 330 K cannot be arranged into any of the universality classes of well-known classical standard models. The maximum entropy change under 5 T of Sn20 (ΔSmaxM=2.43Jkg.K) is slightly higher than that of In20 (ΔSmaxM=2.05Jkg.K). The experimental results of entropy changes are in good agreement with those calculated using Landau theory This work has been supported by the DGRSDT/MESRS Algeria, PHC-Maghreb 15 MAG07, Spanish MINECO projects MAT2013-47231-C2-2-P and MAT2016-75967-P, and the Erasmus+k107 STA program 2024-06-18T11:51:06Z 2024-06-18T11:51:06Z info:eu-repo/date/embargoEnd/2021-07-01 2020-07-01 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion peer-reviewed http://hdl.handle.net/10256/18845 info:eu-repo/semantics/altIdentifier/doi/10.1007/s10948-020-05485-3 info:eu-repo/semantics/altIdentifier/issn/1557-1939 info:eu-repo/semantics/altIdentifier/eissn/1557-1947 info:eu-repo/grantAgreement/MINECO//MAT2013-47231-C2-2-P/ES/NUEVOS MATERIALES (MICRO-NANO ESTRUCTURADOS) PARA DISPOSITIVOS DE EXTRACCION Y CESION DE CALOR, ACTUADORES, SENSORES Y MEMORIAS MAGNETICAS/ info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/MAT2016-75967-P/ES/ALEACIONES CON MEMORIA DE FORMA ACTIVADA POR CAMPO MAGNÉTICO EN MICROESCALA/ Tots els drets reservats info:eu-repo/semantics/openAccess Springer-Verlag © Journal of Superconductivity and Novel Magnetism, 2020, vol. 33, p. 2209-2218 Articles publicats (D-F) Dadda, K. Alleg, Safia Suñol Martínez, Joan Josep Bessais, L. Hill, E.K. 2020 Structure, Magnetocaloric Effect and Critical Behaviour in Ni 50 Mn 30 (Sn, In) 20 Heusler Alloys Journal of Superconductivity and Novel Magnetism 33 2209 2218