Differential thermal analysis of hydrogen-induced amorphization in C15 Laves compounds RFe2

X. G. Li; Akihiko Chiba; K. Aoki; T. Masumoto

doi:10.1016/S0966-9795(97)00009-5

Differential thermal analysis of hydrogen-induced amorphization in C15 Laves compounds RFe₂

X. G. Li, Akihiko Chiba, K. Aoki, T. Masumoto

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The C15 Laves compounds of RFe₂ (R = rare earth metal, Ce, Sm, Gd, Tb, Dy, Ho and Er) were thermal-analyzed by heating in a hydrogen atmosphere of 0·10 to 5·00 MPa at a heating rate of 20 K min^-1. Four kinds of exothermic peaks are observed, which represent hydrogenation, amorphization, crystallization and decomposition. The hydrogen pressure plays an important role in hydrogen-induced amorphization (HIA). HIA for each compound can be observed only when the hydrogen pressure is above a critical level. Increasing hydrogen pressure lowers the amorphization temperature and increases the crystallization temperature. In addition, the amorphization temperature and the critical pressure of HIA as well as the crystallization temperature of the corresponding amorphous alloys increase with increase of the atomic number of R.

Original language	English
Pages (from-to)	387-391
Number of pages	5
Journal	Intermetallics
Volume	5
Issue number	5
DOIs	https://doi.org/10.1016/S0966-9795(97)00009-5
Publication status	Published - 1997 Jan 1
Externally published	Yes

Keywords

A. Laves phases
B. hydrogen storage
Intermetallics
Miscellaneous
Phase transformations

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Differential thermal analysis of hydrogen-induced amorphization in C15 Laves compounds RFe2",

abstract = "The C15 Laves compounds of RFe2 (R = rare earth metal, Ce, Sm, Gd, Tb, Dy, Ho and Er) were thermal-analyzed by heating in a hydrogen atmosphere of 0·10 to 5·00 MPa at a heating rate of 20 K min-1. Four kinds of exothermic peaks are observed, which represent hydrogenation, amorphization, crystallization and decomposition. The hydrogen pressure plays an important role in hydrogen-induced amorphization (HIA). HIA for each compound can be observed only when the hydrogen pressure is above a critical level. Increasing hydrogen pressure lowers the amorphization temperature and increases the crystallization temperature. In addition, the amorphization temperature and the critical pressure of HIA as well as the crystallization temperature of the corresponding amorphous alloys increase with increase of the atomic number of R.",

keywords = "A. Laves phases, B. hydrogen storage, Intermetallics, Miscellaneous, Phase transformations",

author = "Li, {X. G.} and Akihiko Chiba and K. Aoki and T. Masumoto",

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T1 - Differential thermal analysis of hydrogen-induced amorphization in C15 Laves compounds RFe2

AU - Li, X. G.

AU - Chiba, Akihiko

AU - Aoki, K.

AU - Masumoto, T.

PY - 1997/1/1

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N2 - The C15 Laves compounds of RFe2 (R = rare earth metal, Ce, Sm, Gd, Tb, Dy, Ho and Er) were thermal-analyzed by heating in a hydrogen atmosphere of 0·10 to 5·00 MPa at a heating rate of 20 K min-1. Four kinds of exothermic peaks are observed, which represent hydrogenation, amorphization, crystallization and decomposition. The hydrogen pressure plays an important role in hydrogen-induced amorphization (HIA). HIA for each compound can be observed only when the hydrogen pressure is above a critical level. Increasing hydrogen pressure lowers the amorphization temperature and increases the crystallization temperature. In addition, the amorphization temperature and the critical pressure of HIA as well as the crystallization temperature of the corresponding amorphous alloys increase with increase of the atomic number of R.

AB - The C15 Laves compounds of RFe2 (R = rare earth metal, Ce, Sm, Gd, Tb, Dy, Ho and Er) were thermal-analyzed by heating in a hydrogen atmosphere of 0·10 to 5·00 MPa at a heating rate of 20 K min-1. Four kinds of exothermic peaks are observed, which represent hydrogenation, amorphization, crystallization and decomposition. The hydrogen pressure plays an important role in hydrogen-induced amorphization (HIA). HIA for each compound can be observed only when the hydrogen pressure is above a critical level. Increasing hydrogen pressure lowers the amorphization temperature and increases the crystallization temperature. In addition, the amorphization temperature and the critical pressure of HIA as well as the crystallization temperature of the corresponding amorphous alloys increase with increase of the atomic number of R.

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