Crystalline to amorphous transformation in Laves phase GdFe2 induced by hydrogen absorption

Aoki, K.; Yanagitani, A.; Masumoto, T.
June 1988
Applied Physics Letters;6/20/1988, Vol. 52 Issue 25, p2122
Academic Journal
The hydrogen-induced transformation from the crystalline to the amorphous state in GdFe2 has been studied by means of differential thermal analysis. GdFe2 absorbs hydrogen in the crystalline state above 420 K by an exothermic reaction. The resultant crystalline c-GdFe2H3.8 alloy transforms to the amorphous a-GdFe2H2.8 alloy above 470 K exothermally, which crystallizes to the stable phases α-Fe and GdH2 above about 700 K. The driving force for the hydrogen-induced transformation is suggested to be the difference in the enthalpy resulting from the different hydrogen occupation sites in both states of alloy.


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