Effect of rare earth on the thermostability and the surface area of autocatalyst washcoats

In order to develop adequate rare earth refrigerants used below 250 K and avoid the negative magnetocaloric effect of Dysprosium and the expensive cost of Terbium, the heavy–light rare earth alloys are considered. In the present paper we report the magnetic entropy measurements for the alloys (Gd,Dy)1-xNdx (x=0, 0.1, 0.2, 0.3). These alloys, unlike most of the heavy rare earth metals, have only one magnetic ordering phase, that is, the ferromagnetic ordering.