57Fe Mössbauer study in the ternary hydrides of ErFe3

The ternary hydride phases ErFe₃Hx (with x=1.5 and 2.7) has been studied by⁵⁷Fe Mössbauer effect. The spectra show that the spin reorientation temperature is increased by the presence of hydrogen in the ErFe₃ lattice and is independent of hydrogen concentration for the two hydrides investigated. A preferential filling of the interstitial sites in the RFe₃ structure is indicated by the data.Work supported in part by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Financiadora de Estudos e Projetos (FINEP).