R. Müller,M. Bobeth,Holger Brumm,Gerhard Gille,W. Pompe,J. Thomas
出处
期刊:International Journal of Materials Research [De Gruyter] 日期:2007-11-01卷期号:98 (11): 1138-1145被引量:24
标识
DOI:10.3139/146.101567
摘要
Abstract Electron microscopic observations revealed the development of a complex interpenetrating morphology of magnesia and tantalum after magnesium-vapour reduction of tantalum oxide powder. In the early reaction stage, a nanoscale lamellar and rod-like morphology is found. This rather regular structure decomposes and coarsens during further annealing. By leaching of magnesia, nanoporous tantalum with large inner surface area is obtained. A possible growth mechanism for the observed initial cellular structure is proposed. A theoretical analysis aims at finding the optimum process parameters in order to prepare and to stabilise especially fine magnesiatantalum structures as a base for producing highly nanoporous tantalum for capacitor applications.