%A Hu Feng-xia (胡凤霞), Shen Bao-gen (沈保根), Sun Ji-rong (孙继荣), Zhang Xi-xiang (张西祥) %T GREAT MAGNETIC ENTROPY CHANGE IN La(Fe, M)13 (M=Si, Al) WITH Co DOPING %0 Journal Article %D 2000 %J Chin. Phys. B %R 10.1088/1009-1963/9/7/016 %P 550-553 %V 9 %N 7 %U {https://cpb.iphy.ac.cn/CN/abstract/article_106647.shtml} %8 2000-07-15 %X Very large magnetic entropy change $\Delta$SM, which originates from a fully reversible second-order transition at Curie temperature TC, has been discovered in compounds La(Fe, Si)13, La(Fe, Al)13 and those with Co doping. The maximum change $\Delta$SM $\approx$ 19 J·kg-1·K-1, achieved in LaFe11.4Si1.6 at 209K upon a 5T magnetic field change, exceedsthat of Gd by more than a factor of 2. The TC of the Co-doped compounds shifts to higher temperatures. $\Delta$SM still has a considerable large magnitude near room temperature. The phenomena of very large $\Delta$SM, convenience of adjustment of TC, and also thesuperiority of low cost, strongly suggest that the compounds La(Fe,M)13(M=Si, Al) with Co doping are suitable candidates for magnetic refrigerants at high temperatures.