Effect of interstitial hydrogen on UFexAl12-x

Polycrystalline samples of UFexAl12-x with x=4.5, 4.7, 4.85 and 5.0 were ob tained by induction milling followed by annealing at 800 degreesC for 3 wee ks, The structure of all the samples was checked by powder X-ray diffractio n and the final composition estimated using the Rietveld method. The introd uction of interstitial hydrogen was performed by a reaction at high pressur e and the final compounds were characterized by X-ray diffraction. magnetiz ation measurements and Mossbauer spectroscopy. These results showed a signi ficant modification in the magnetic behaviour after the insertion of hydrog en. (C) 2001 Elsevier Science B.V. AII rights reserved.