LOW-TEMPERATURE HEAT-CAPACITY AND MAGNETIC MEASUREMENTS OF URANIUM 3D-METAL HYDRIDES

Specific heats and magnetic properties as a function of temperature an d magnetic field for U6MH17 (M = Fe, Co, Mn and Ni) hydrides have been measured. These hydrides crystallize in the cubic Pm3n space group, l ike beta-UH3. The compounds are ferromagnets. The essential thermodyna mic functions of the entropy S and energy E for magnetic heat contribu tion were evaluated. It was established, that 3d-metals change the mag nitude of the magnetic anisotropy having, however a negligible influen ce on the magnetic transition temperature. The spin-reorientation tran sitions, suggested previously, were not confirmed.