Magnetic properties and magnetic entropy change of LaFe11.5Si1.5 and melt-spun La1-xNdxFe11.5Si1.5 compounds

作者：Lu W^*; Xie K; Yang S; Song XP

来源：Rare Metal Materials and Engineering, 2006, 35(1): 82-84.

• magnetic entropy changes
• melt-spun
• magnetism refrigeration
• La1-xNdxFe11.5Si1.5 ribbons

The structure and magnetic properties of annealed (950 degrees C, 100 h) LaFe11.5Si1.5 ingots and annealed (1000 degrees C, 5 h) melt-spun La1-xNdxFe11.5Si1.5 (x=0, 0.3, 0.5) ribbons were investigated by means of X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). All ribbons are in the NaZn13-type structure and no 1:13 phase is observed in ingots though their annealing time is longer than that of ribbons, which suggests that the NaZn13-type compounds with large magnetic entropy change (vertical bar Delta S vertical bar) can be produced by melt spinning. Therefore, the production cost will be cut significantly because of short annealing time. Curie temperature (T-c) is slightly improved and the effective refrigeration temperature range is slightly broadened with the Nd content increasing in La1-xNdxFe11.5Si1.5 (x=0, 0.3, 0.5) ribbons. In summary, La1-xNdxFe11.5Si1.5 ribbons with x=0.3 have the best refrigeration efficiency and they are promising to become low-cost, high efficiency magnetism refrigeration materials near room temperature.

• 出版日期2006-1
• 单位西安交通大学