Magnetic and Crystallographic Properties of Deuterides YFe_<b>2</b>D_<i>x</i>

Abstract

The isothermal deuterium absorption and desorption experiments, X-ray and magnetization measurements revealed four types of deuterides in YFe 2 D x , γ 1 of 3.8< x , γ 2 of x <3.4, and β 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 µ B /YFe 2 D x and the Curie temperatures are 120 K for the γ 1 -deuteride and 300 K for the γ 2 -deuteride. The β-deuteride is always a mixture with the amorphous deuteride, and the Curie temperature of amorphous deuteride is 570 K and that of β-deuteride varies from 290 K to 400 K with increasing deuterium concentration. Mössbauer mesurements were performed and hyperfine fields of Fe were estimated for every deuterides.