Hydrogen-induced amorphization in C15 Laves phases RFe2

被引：33

作者：

Dilixiati, M ^{[1
]}

Kanda, K ^{[1
]}

Ishikawa, K ^{[1
]}

Aoki, K ^{[1
]}

机构：

[1] Kitami Inst Technol, Kitami, Hokkaido 0908507, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 337卷

关键词：

rare earth compounds; hydrogen absorbing alloys; amorphous alloys; calorimetry;

D O I：

10.1016/S0925-8388(01)01923-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

C15 Laves phases RFe2 (R=Y, Ce, Sin, Gd, Tb, Dy, Ho and Er) were thermally analyzed to elucidate the conditions of hydrogen-induced amorphization (HIA) using a pressure differential scanning calorimeter (PDSC) in a hydrogen atmosphere. Hydrogen absorption in the crystalline state, hydrogen-induced amorphization (HIA), precipitation of RH, and decomposition of the remaining amorphous phase into RH2+alpha-Fe occur exothermally with increasing the temperature in RFe2 (R=Y, Sm, Gd, Tb, Dy and Ho), although HIA in YFe2 occurs through two stages. The absorption temperature of hydrogen (T-a) and the precipitation temperature of RH2 (T-p) are nearly constant and independent of the atomic number of R, but the temperature of HIA (To) increases with increasing atomic numbers. As a result, hydrogen absorption and HIA Occur simultaneously in CeFe2 while HIA and precipitation of ErH2 occur simultaneously in ErFe2. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：128 / 135

页数：8

共 10 条

[1] HYDROGEN INDUCED AMORPHIZATION IN RNI2 LAVES PHASES [J].