Magnetic Properties and Crystal Structure of Laves Phase (Y_xZr_1−x)Fe₂ and Their Hydrides

Abstract

Lavas phase compounds (Y_xZr_1−x)Fe₂ have C15 structure, and are ferromagnetic. They absorb hydrogen under the condition of 1 atm, room temperature, to form hydrides (Y_xZr_1−x)Fe₂H_y. Hydrogen content y increases from O(ZrFe₂) to 4.2(YFe₂) with x continuously. The dependence of μ_Fe and T_c of hydrides on x is different for hydrogen content, namely y>3 or y<3. In y\gtrsim3, the hydrogen is assumed to form spinel structure with parent compound and the hydrogen is in H⁻ like state. In y\lesssim3, it is assumed that the hydrogen forms solid solution in H⁺ like state.