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.
REFERENCES
1.
K.
Aoki
, K.
Shirakawa
, and T.
Masumoto
, Sci. Rep. Res. Inst. Inst. Tohoku Univ.
A‐32
, 239
(1985
).2.
3.
V. P.
Boncour
, A. P.
Guegan
, M.
Diaf
, and J. C.
Achard
, J. Less‐Common Met.
131
, 201
(1987
).4.
K.
Chattopadyhay
, K.
Aoki
, and T.
Masumoto
, Scr. Metall.
21
, 365
(1987
).5.
K.
Aoki
, T.
Yamamoto
, Y.
Satoh
, K.
Fukamichi
, and T.
Masumoto
, Acta Metall.
35
, 2465
(1987
).6.
K.
Aoki
, M.
Nagano
, A.
Yanagitani
, and T.
Masumoto
, J. Appl. Phys.
62
, 3314
(1987
).7.
K. Aoki, A. Yanagitani, X.‐G. Li, and T. Masumoto, Mater, Sci. Eng. 89 (in press).
8.
B. P.
Doling
, M. A.
Vanek
, T.
Mcgory
, and D. J.
Ham
, J. Non‐Cryst. Solids
87
, 281
(1986
).9.
10.
11.
M. Matsuura, K. Fukamichi, H. Komatsu, K. Aoki, T. Masumoto, and K. Suzuki, Mater. Sci. Eng. 89 (in press).
This content is only available via PDF.
© 1988 American Institute of Physics.
1988
American Institute of Physics
You do not currently have access to this content.
