Magnetic behavior of metal hydrides as a function of hydrogen pressure and composition

Abstract

A versatile vibrating-sample magnetometer has been developed which measures the magnetization of metal hydrides as a function of magnetic field, hydrogen pressure (up to 6 MPa), and composition, temperature, and time. For the ferromagnetic NdCo5Hx system, magnetic properties of well-defined hydrides and hydride-phase transformations are studied by this method. The existence of a hydrogen-rich phase in the NdCo5Hx system, the γ phase, is indicated by the temperature dependence of magnetization under the influence of high pressure hydrogen.