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Microstructure of MmM(5)/Mg multi-layer hydrogen storage films prepared by magnetron sputtering.

Authors :
Ouyang LZ
Wang H
Zhu M
Zou J
Chung CY
Source :
Microscopy research and technique [Microsc Res Tech] 2004 Jul 01; Vol. 64 (4), pp. 323-9.
Publication Year :
2004

Abstract

Multi-layer hydrogen storage thin films with Mg and MmNi3.5(CoAlMn)1.5 (here Mm denotes La-rich mischmetal) as alternative layers were prepared by direct current magnetron sputtering. Transmission electron microscopy investigation shows that the microstructure of the MmNi3.5(CoAlMn)1.5 and Mg layers are significantly different although their deposition conditions are the same. The MmNi3.5(CoAlMn)1.5 layer is composed of two regions: one is an amorphous region approximately 4 nm thick at the bottom of the layer and the other is a nanocrystalline region on top of the amorphous region. The Mg layer is also composed of two regions: one is a randomly orientated nanocrystalline region 50 nm thick at the bottom of the layer and the other is a columnar crystallite region on top of the nanocrystalline region. These Mg columnar crystallites have their [001] directions parallel to the growth direction and the average lateral size of these columnar crystallites is about 100 nm. A growth mechanism of the multi-layer thin films is discussed based on the experiment results.<br /> (2004 Wiley-Liss, Inc.)

Details

Language :
English
ISSN :
1059-910X
Volume :
64
Issue :
4
Database :
MEDLINE
Journal :
Microscopy research and technique
Publication Type :
Academic Journal
Accession number :
15481046
Full Text :
https://doi.org/10.1002/jemt.20089