摘要
The corrosion and magnetocaloric property of LaFe11.5 Si1.5 compound with excess La from 0 wt% to 15 wt% were investigated by a scanning electron microscope(SEM), electrochemical workstation and a vibrating sample magnetometer(VSM). With the increase of excess La from 0 wt%, 5 wt% to 10 wt% and15 wt%, most of the La-rich phase changes from granular La2 O3 phase to grain boundary LaFeSi phase.The La2 O3 is more stable than the main 1:13 phase, while LaFeSi phase is easy to be corroded than the1:13 phase. The maximum entropy change-△Smaxis 18.60, 21.48, 19.66 and 16.28 J/(kg·K) for 0 wt%,5 wt%, 10 wt% and 15 wt% excess of La, respectively. As adding 5 wt% excess La in LaFe11.5 Si1.5 compound leads to nearly single 1:13 phase, the largest magnetic entropy change and better corrosion resistance are obtained.
The corrosion and magnetocaloric property of LaFe11.5 Si1.5 compound with excess La from 0 wt% to 15 wt% were investigated by a scanning electron microscope（SEM）, electrochemical workstation and a vibrating sample magnetometer（VSM）. With the increase of excess La from 0 wt%, 5 wt% to 10 wt% and15 wt%, most of the La-rich phase changes from granular La2 O3 phase to grain boundary LaFeSi phase.The La2 O3 is more stable than the main 1:13 phase, while LaFeSi phase is easy to be corroded than the1:13 phase. The maximum entropy change-△Smaxis 18.60, 21.48, 19.66 and 16.28 J/（kg·K） for 0 wt%,5 wt%, 10 wt% and 15 wt% excess of La, respectively. As adding 5 wt% excess La in LaFe11.5 Si1.5 compound leads to nearly single 1:13 phase, the largest magnetic entropy change and better corrosion resistance are obtained.
基金
Project supported by the Natural Science Foundation of Hebei Education Department(Grant No.ZD2017066,2018101000441)
Special Funding Projects for Scientific Research of Shijiazhuang Tiedao University(Grant No.Z661210729)
Tianjin Research Program of Application Foundation and Advanced Technology(Grant No.14JCQNJC04000)
