%0 Journal Article
%T Hydrogen Storage Properties of Mg and Mg-Ni Films Prepared by Thermal Evaporation<br>热蒸发法制备Mg和Mg-Ni薄膜及其氢化性能
%A WANG Hui
%A OUYANG Liuzhang
%A ZENG Meiqin
%A ZHU Min
%A <br>王辉
%A 欧阳柳章
%A 曾美琴
%A 朱敏
%J 金属学报
%D 2004
%I 
%X Microstructure and hydrogenation properties of Mg and Mg-Ni films fabricated by thermal evaporation method were investigated. The as deposited Mg film exhibits a preferred orientation and a typical columnar crystalline structure. The as deposited Mg-Ni film with a composition of Mg_(78)Ni_(22) is composed of nanocrystalline Mg_2Ni, Mg and a small amount of amorphous phase. Besides, the Mg_2Ni crystallites grow with their (001) crystalline plane parallel to the substrate surface. The hydrogen absorption and desorption temperatures of pure Mg film are 593 K and 653 K, respectively and its hydriding reaction follows a nucleation and growth mechanism. Pressure-composition isotherms of Mg_(78)Ni_(22) film show that its maximum hydrogen absorption capacity (mass fraction) reaches to 5.7% and there are the lower and higher pressure plateaus corresponding to the hydriding reactions of Mg and Mg_2Ni, respectively. The hydriding/dehydriding temperatures of Mg in Mg_(78)Ni_(22) film decreased down to 473 K and 503 K, respectively. The improvement on the hydrogenation properties of Mg is related to the catalytic role of nanocrystalline Mg_2Ni and amorphous phase.
%K hydrogen storage alloy
%K thermal evaporation
%K Mg film
%K Mg-Ni film
%K hydrogenation property<br>储氢合金
%K 热蒸发
%K Mg膜
%K Mg—Ni薄膜
%K 氢化性能
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=C935D1C2260AF395&yid=D0E58B75BFD8E51C&vid=1371F55DA51B6E64&iid=94C357A881DFC066&sid=20ADD38F841C6A4B&eid=323E8A365B085E0B&journal_id=0412-1961&journal_name=金属学报&referenced_num=3&reference_num=49