Abstract
By means of 57Fe Mössbauer spectroscopy, values of the average isomer shifts at 4.2 and 300 K, the average hyperfine field at 4.2 K and the magnetic ordering temperatures were measured for Gd( 57Fe 0.01Mn 0.99) 2H x (0⩽ x⩽4.2). The relative importance of the volume expansion and band effects due to hydrogen absorption were deduced from isomer shift changes. The nonlinear increase of the magnetic ordering temperature values versus x and abrupt increase of the average hyperfine field for x⩾2.5 were revealed. Using YMn 2H x results as reference, the magnitude of the 4f–3d interaction versus Mn–Mn distance for GdMn 2H x was inferred.
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