Magnetic and crystallographic properties of deuterides YFe2Dx

The isothermal deuterium absorption and desorption experiments, X-ray and magnetization measurements revealed four types of deuterides in YFe2Dx, gamma(1) of 3.8 < x, gamma(2) of x < 3.4, and beta and amorphous of x < 2.1 at room temperature. The crystal structure of all deuterides are rhombohedral. The magnetization of all deuterides are about 3.8 mu(B)/YFe2Dalpha and the Curie temperatures are 120 K for the gamma(1)-deuteride and 300 K for the gamma(2)-deuteride. The beta-deuteride is always a mixture with the amorphous deuteride, and the Curie temperature of amorphous deuteride is 570 K and that of beta-deuteride varies from 290 K to 400 K with increasing deuterium concentration. Mossbauer mesurements were performed and hyperfine fields of Fe were estimated for every deuterides.