缺陷对混合稀土贮氢合金性能的影响  

Effect of Defect on the Properties of the Pentanary Mischmetal -Based Hydrogen Storage Alloys

作　　者：王连邦[1] 袁华堂[1] 林荫浓[1] 周康 张允什[1] 冯嘉帧[2] 

机构地区：[1]南开大学新能源材料化学研究所,天津300071 [2]天津师范大学测试中心,天津300073

出　　处：《化学学报》1999年第12期1338-1342,共5页Acta Chimica Sinica

基　　金：国家"863"高科技项目基金资助

摘　　要：贮氢合金是一种重要的功能材料.在多种贮氢合金中,AB_5型稀土系贮氢合金的应用最为广泛.本文用正电子湮没技术(PAT)对AB_5型混合稀土贮氢合金的缺陷进行了研究,并结合X射线衍射(XRD)测试、循环伏安(CV)测试以及合金容量的测定,对合金的结构及性能进行了研究.结果表明,合金微观缺陷的存在能大幅度提高合金的性能.Hydrogen storage alloy is an important functional material. Of all the hydrogen storage alloys studied previously, AB5 - type mischmetal - based hydrogen storage alloy is used most widely. In this paper, positron- annihilation technique (PAT) is used to study the defect of the alloys. At the same time, X- ray diffraction (XRD), cyclic voltammetry (CV) and electrochemical capacities of the alloys are investigated to characterize the structure and properties of the alloys. Experimental results show that the microdefect in the alloys can improve the properties of the alloys apparently.

关 键 词：正电子湮没 AB5型 稀土系 贮氢合金 缺陷 

分 类 号：TG139.7[一般工业技术—材料科学与工程]