Effect of magnetic phase transitions on magnetic susceptibility in high-magnetostriction rare-earth-iron compounds

Investigation results on the effect of composition in the system Tbsub(x)Dysub(1-x)Eesub(2) on magnetic susceptibility chi in weak fields are presented. A non-monotonic temperature dependence of sUsceptibility for alloys with terbium content below 0.45 is detected. In the range of low temperatures chi values of the alloys are similar. At 17O...220 K susceptibility increases sharply and reaches the maximum values at the temperature of orientation phase transition (OPT). Alloys with terbium content 0.25-0.29 possess the highest susceptibility at room temperature. When recording the curves chi(T) in different fields a regular shift of OPT temperature to the range of low temperatures with a magnetic field intensity increase is established. By means of extrapolation OPT temperatures in h a magnetic field intensity increase is established. By means of extrapolation OPT temperatures in zero field are determined and OPT diagram is built, from which the effect of magnetic field is excluded