Open AccessMartensitic transformation and magnetocaloric effect in Ni-Co-Mn-Sn Heusler alloy
Author(s) -
张浩雷,
李哲,
乔燕飞,
曹世勋,
张金仓,
敬超
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.7857
Subject(s) - magnetic refrigeration , materials science , condensed matter physics , austenite , magnetic shape memory alloy , diffusionless transformation , alloy , ferromagnetism , magnetism , magnetic field , magnetization , magnetic domain , metallurgy , microstructure , physics , quantum mechanics
The crystal structure and phase transition in Ni50-xCoxMn38Sn12x=1, 2, 4, 6, 8 Heusle alloys were investigated by means of structure analysis and magnetism measurements. The results show that the doping of the Co atom affects neither the original structure of Ni-Mn-Sn Heusler alloys, nor the ferromagnetic interaction strengthens in the austenitic state. Furthermore, based on Maxwell equation, the magnetic entropy change ΔSM of three samples x=2, 4, 6 has been calculated. A large magnetic entropy change of 37.09 J/kg K at about 320 K for a magnetic field change of 50 kOe is obtained in Ni48Co2Mn38Sn12 alloy.