Effect of excess lanthanum on corrosion and magnetocaloric property of LaFe11.5Si1.5 compounds
来源期刊：Journal of Rare Earths2019年第10期
论文作者：Jie Hu Zhongqi Dong Yingming Shen Bin Fu Bianfang Zhang
文章页码：1116 - 1120
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.
Jie Hu1，Zhongqi Dong2，Yingming Shen1，Bin Fu3，Bianfang Zhang1
1. School of Materials Science and Engineering, Shijiazhuang Tiedao University2. Department of Materials Engineering, Hebei College of Industry and Technology3. School of Materials Science and Engineering, Tianjin University of Technology
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.
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