Abstract
Powder samples of TbMn 2H x hydrides, with 0≤ x≤4.3, are characterised by X-ray analysis and SQUID magnetometry for temperatures ranging between 2 and 375 K. We observed structural phase transformations as a function of the hydrogen concentration and temperature. In particular a spinodal decomposition for x<2 has been found. The structural transformations are reflected in the magnetic behaviour. The analysis of the magnetic data as a function of the hydrogen content, temperature and magnetic field shows that there are changes in antiferromagnetic ordering strongly influenced by the interactions between the Mn and Tb magnetic moments. Tentative magnetic and structural phase diagrams are proposed.
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