The influence of the purity of Gd on the magnetocaloric effect in Gd_5Si_2-xGe_2-xZn_2- alloys

摘要

Gd_5Si_2Ge_2-based alloys can exhibit a giant magnetocaloric effect (GMCE) which gives them the potential use in the cooling technologies[1].Through this studies, it can be found that the purity of Gd had a great impact on the magnetocaloric effect in Gd5Si2-xGe2-xZn2x alloys. When 3N Gd used and 2x=0.01, Gd_5Si_2-xGe_2-xZn_2X around the curie point of 280k get the maximum magnetic entropy change of 14.0 J/(Kg.K) under the external magnetic field change from 0 to IT, but when 2N Gd used and 2x=0.05, Gd5Si2-xGe2-xZn2X around the curie point of 284.2k under the external magnetic field change IT get the maximum magnetic entropy change 6.65 J/(Kg.K).