作者:K. Ishikawa、N. Ogasawara、K. Aoki
DOI:10.1016/j.jallcom.2004.11.114
日期:2005.12
amorphous phase into α-Mn and NdH 3 were observed with increasing temperature between 0.1 and 1.0 MPa H 2 . HIA and the precipitation of NdH 3 occurred separately above 2.0 MPa H 2 . The peak temperature for HIA of C14 Laves phase NdMn 2 and its pressure dependence is higher and smaller than those of C15 Laves phases RFe 2 . HIA of NdMn 2 occurred for every hydrogen pressure, although the single phase amorphous
使用压差扫描量热仪(PDSC)、粉末X射线衍射仪(XRD)、常规差示扫描量热仪(Ar-DSC)研究了C14 Laves相NdMn 2 在0.1-5.0 MPa氢气氛中的结构变化,透射电子显微镜(TEM)和氢分析仪。三个放热峰由 (1) 晶态吸氢,(2) 氢诱导非晶化 (HIA) 和同时发生的 BiF 3 型 NdH 3 沉淀,以及 (3) 剩余非晶相的分解产生随着温度在 0.1 到 1.0 MPa H 2 之间升高,观察到进入 α-Mn 和 NdH 3 。HIA 和 NdH 3 的沉淀分别发生在 2.0 MPa H 2 以上。C14 Laves 相 NdMn 2 的 HIA 峰值温度及其压力依赖性高于和小于 C15 Laves 相 RFe 2 的峰值温度。尽管在低于 1.0 MPa H 2 时不会形成单相非晶氢化物,但 NdMn 2 的 HIA 在每个氢气压力下都会发生。