X-Ray absorption spectroscopy of transition metal-magnesium hydride thin films

被引：31

作者：

Richardson, TJ ^{[1
]}

Farangis, B ^{[1
]}

Slack, JL ^{[1
]}

Nachimuthu, P ^{[1
]}

Perera, R ^{[1
]}

Tamura, N ^{[1
]}

Rubin, M ^{[1
]}

机构：

[1] Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2003年 / 356卷

关键词：

hydrogen storage materials; thin films; EXAFS; NEXAFS; X-ray diffraction;

D O I：

10.1016/S0925-8388(02)01237-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption spectroscopy. Mg K-edge and Ni, Co, and Ti L-edge spectra reflect both reversible and irreversible changes in the metal environments. A significant shift in the nickel L absorption edge shows it to be an active participant in hydride formation. The effect on cobalt and titanium is much less dramatic, suggesting that these metals act primarily as catalysts for formation of magnesium hydride. (C) 2002 Published by Elsevier B.V. All rights reserved.

引用

页码：204 / 207

页数：4

共 8 条

[1] AN EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE DENSITIES OF STATES OF DIMAGNESIUM COBALT PENTAHYDRIDE [J].

BELIN, E ;

GUPTA, M ;

ZOLLIKER, P ;

YVON, K .

JOURNAL OF THE LESS-COMMON METALS, 1987, 130 :267-274

[2] HEXAMAGNESIUM DICOBALT UNDECADEUTERIDE MG6CO2D11 - CONTAINING [COD4]5- AND [COD5]4- COMPLEX ANIONS CONFORMING TO THE 18-ELECTRON RULE [J].

CERNY, R ;

BONHOMME, F ;

YVON, K ;

FISCHER, P ;

ZOLLIKER, P ;

COX, DE ;

HEWAT, A .

JOURNAL OF ALLOYS AND COMPOUNDS, 1992, 187 (01) :233-241

[3] Calculation of thermodynamic, electronic, and optical properties of monoclinic Mg2NiH4 [J].

Myers, WR ;

Wang, LW ;

Richardson, TJ ;

Rubin, MD .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (08) :4879-4885

[4] Correlation between surface and bulk phenomena in the process of thin palladium hydride and titanium hydride film formation [J].

Nowicka, E .

VACUUM, 1997, 48 (3-4) :199-202

[5] Switchable mirrors based on nickel-magnesium films [J].

Richardson, TJ ;

Slack, JL ;

Armitage, RD ;

Kostecki, R ;

Farangis, B ;

Rubin, MD .

APPLIED PHYSICS LETTERS, 2001, 78 (20) :3047-3049

[6] Mixed metal films with switchable optical properties [J].

Richardson, TJ ;

Slack, JL ;

Farangis, B ;

Rubin, MD .

APPLIED PHYSICS LETTERS, 2002, 80 (08) :1349-1351

[7] NEW STRUCTURE RESULTS FOR HYDRIDES AND DEUTERIDES OF THE HYDROGEN STORAGE MATERIAL MG2NI [J].

SCHEFER, J ;

FISCHER, P ;

HALG, W ;

STUCKI, F ;

SCHLAPBACH, L ;

DIDISHEIM, JJ ;

YVON, K ;

ANDRESEN, AF .

JOURNAL OF THE LESS-COMMON METALS, 1980, 74 (01) :65-73

[8] DIMAGNESIUM COBALT(I) PENTAHYDRIDE, MG2COH5, CONTAINING SQUARE-PYRAMIDAL COH54- ANIONS [J].

ZOLLIKER, P ;

YVON, K ;

FISCHER, P ;

SCHEFER, J .

INORGANIC CHEMISTRY, 1985, 24 (24) :4177-4180

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