C15 Laves RFe_2化合物氢诱导非晶化转变的热分析  

Thermal Analysis of Hydrogen-induced Amorphization in C15 Laves RFe_2 Compounds

作　　者：地里夏提·买买提 [1] 亚生江 [2] 玉素甫艾力  青木清  

机构地区：[1]新疆大学,资源与环境科学学院 新疆,乌鲁木齐,830046 [2]新疆石油学院,机械系,乌鲁木齐,830046 [3]日本北见工业大学,工学部

出　　处：《新疆大学学报（自然科学版）》2005年第4期453-456,共4页Journal of Xinjiang University(Natural Science Edition)

摘　　要：在氢气氛中对C 15 L aves RF e2(R=Y,C e,Sm,G d,T b,D y,Ho,E r)化合物利用差示热分析(DSC)法、X—ray衍射(XRD)法进行了热力学分析及氢分析.发现RF e2相(R=Y,C e,Sm,G d,T b,D y)随温度的升高出现吸氢、氢诱导非晶化(H IA)、RH2的沉淀析出及非晶相的晶化过程.当R=C e时,吸氢及非晶化(H IA)是同时进行的;当R=E r时,非晶化(H IA)及E rH2的沉淀析出是同时进行的.同时对RF e2在氢气氛加热过程中的焓变(ΔH)及反应能(ΔE)的变化通过差示热分析(DSC)进行评价.Structural changes of C15 Laves RFe2 （R=Y, Ce, Sm, Gd, Tb, Dy, Ho and Er）compounds during thermal analysis in an H2 atmosphere were investigated by scanning differential calorimetry （DSC）, powder X- ray diffraction （XRD） and hydrogen analysis. Hydrogen absorption, hydrogen-induced amorphization （HIA）, precipitation of RH2 and crystallization of an amorphous phase occurred with increasing temperature for R = Y, Sm,Gd,Tb,Dy and Ho. Hydrogen ahsorption and IliA occurred simultaneously for R=Ce, while HIA and procipition of Erh2 occurr simultaneously for R=Er. The enthalpy change △H and the activation energy AE for thermal reactions of RFe2 during heating in a hydrogen atmosphere were evaluated by DSC.

关 键 词：C15Laves相 非晶质 反应能 稀有金属 

分 类 号：O613[理学—无机化学]