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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Hydrogen-induced amorphization in C15 Laves phases RFe_2
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Hydrogen-induced amorphization in C15 Laves phases RFe_2

机译：氢致C15 Laves相RFe_2的非晶化

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摘要

C15 Laves phases RFe_2 (R=Y, Ce, Sm, 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_2 and decomposition of the remaining amorphous phase into RH_2+alpha-Fe occur exothermally with increasing the temperature in RFe_2 (R=Y, Sm, Gd, Tb, Dy and Ho), although HIA in YFe_2 occurs through two stages. The absorption temperature of hydrogen (T_a) and the precipitation temperature of PH_2 (T_p) are nearly constant and independent of the atomic number of R, but the temperature of HIA (T_H) increases with increasing atomic numbers. As a result, hydrogen absorption and HIA occur simultaneously in CeFe_2, while HIA and precipitation of ErH_2 occur simultaneously in ErFe_2.
机译：使用氢气中的压差扫描量热仪（PDSC）对C15 Laves相RFe_2（R = Y，Ce，Sm，Gd，Tb，Dy，Ho和Er）进行热分析，以阐明氢致非晶化（HIA）的条件大气层。随着RFe_2中温度的升高（R = Y，Sm，Gd，Tb，Rb），温度升高时，晶体中的氢吸收，氢诱导的非晶化（HIA），RH_2的沉淀以及剩余的无定形相分解为RH_2 +α-Fe分解。 Dy和Ho），尽管YFe_2中的HIA发生两个阶段。氢的吸收温度（T_a）和PH_2的沉淀温度（T_p）几乎恒定并且与R的原子数无关，但是HIA的温度（T_H）随着原子数的增加而增加。结果，在CeFe_2中氢吸收和HIA同时发生，而在ErFe_2中HIA和ErH_2的沉淀同时发生。

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