Magnetocaloric Effects Of La0.8r0.2(Fe0.88si0.12)(13) (R = Y, Ho And Yb) Compounds In Low Applied Magnetic Field

Low field magneto-caloric response is important for application. We present here the results of a study on crystal structure and magnetic properties of rare-earth doped compounds La0.8R0.2(Fe0.88Si0.12)(13) (R = Y, Ho and Yb). All samples were prepared by using arc-melting method in argon atmosphere. The lattices revealed by X-ray diffraction method show a well-defined NaZn13-type structure with small amounts of alpha-Fe phase. The dependence of magnetization on temperature M(T) and on field M(H) curves were recorded. The magnetic entropy change -Delta S-m and cooling powers (RCP) of compounds were estimated. The results show considerable better magneto-caloric responses of doped compounds in comparison with that of the undoped compound.