Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

A. Baldi; R.F.A. Gremaud; D.M. Borsa; C. P. Balde; A. M. J. van der Eerden; G. L. Kruijtzer; P. E. de Jongh; B. Dam; R.P. Griessen

doi:10.1016/j.ijhydene.2008.11.090

Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

A. Baldi, R.F.A. Gremaud, D.M. Borsa, C. P. Balde, A. M. J. van der Eerden, G. L. Kruijtzer, P. E. de Jongh, B. Dam, R.P. Griessen

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Abstract

A detailed structural analysis of Mg-Ti-H thin films reveals the presence of a chemically partially segregated but structurally coherent metastable phase. By combining X-Ray Diffraction and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy on MgyTi1-yHx thin films we find non-zero Chemical Short-Range Order (CSRO) parameters for all the compositions measured. Despite the positive enthalpy of mixing of Mg and Ti the degree of ordering does not increase upon loading and unloading with hydrogen. The robustness of this system and the fast and reversible kinetics of hydrogen loading and unloading are caused by the formation of nanoscale compositional modulations in the intermetallic alloy. This microstructure is responsible for the exceptional properties of MgyTi1-yHx, thin films. It also shows that reversible metastable metal-hydrides offer new possibilities for hydrogen storage, beyond the limits imposed by thermodynamic equilibrium. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	1450-1457
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	34
Issue number	3
DOIs	https://doi.org/10.1016/j.ijhydene.2008.11.090
Publication status	Published - Feb 2009

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Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

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10.1016/j.ijhydene.2008.11.090

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@article{64b60f54e9be4601bb6d8bdcfe3ae501,

title = "Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage",

abstract = "A detailed structural analysis of Mg-Ti-H thin films reveals the presence of a chemically partially segregated but structurally coherent metastable phase. By combining X-Ray Diffraction and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy on MgyTi1-yHx thin films we find non-zero Chemical Short-Range Order (CSRO) parameters for all the compositions measured. Despite the positive enthalpy of mixing of Mg and Ti the degree of ordering does not increase upon loading and unloading with hydrogen. The robustness of this system and the fast and reversible kinetics of hydrogen loading and unloading are caused by the formation of nanoscale compositional modulations in the intermetallic alloy. This microstructure is responsible for the exceptional properties of MgyTi1-yHx, thin films. It also shows that reversible metastable metal-hydrides offer new possibilities for hydrogen storage, beyond the limits imposed by thermodynamic equilibrium. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.",

author = "A. Baldi and R.F.A. Gremaud and D.M. Borsa and Balde, {C. P.} and {van der Eerden}, {A. M. J.} and Kruijtzer, {G. L.} and {de Jongh}, {P. E.} and B. Dam and R.P. Griessen",

note = "Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage",

year = "2009",

month = feb,

doi = "10.1016/j.ijhydene.2008.11.090",

language = "English",

volume = "34",

pages = "1450--1457",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

AU - Baldi, A.

AU - Gremaud, R.F.A.

AU - Borsa, D.M.

AU - Balde, C. P.

AU - van der Eerden, A. M. J.

AU - Kruijtzer, G. L.

AU - de Jongh, P. E.

AU - Dam, B.

AU - Griessen, R.P.

N1 - Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

PY - 2009/2

Y1 - 2009/2

N2 - A detailed structural analysis of Mg-Ti-H thin films reveals the presence of a chemically partially segregated but structurally coherent metastable phase. By combining X-Ray Diffraction and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy on MgyTi1-yHx thin films we find non-zero Chemical Short-Range Order (CSRO) parameters for all the compositions measured. Despite the positive enthalpy of mixing of Mg and Ti the degree of ordering does not increase upon loading and unloading with hydrogen. The robustness of this system and the fast and reversible kinetics of hydrogen loading and unloading are caused by the formation of nanoscale compositional modulations in the intermetallic alloy. This microstructure is responsible for the exceptional properties of MgyTi1-yHx, thin films. It also shows that reversible metastable metal-hydrides offer new possibilities for hydrogen storage, beyond the limits imposed by thermodynamic equilibrium. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

AB - A detailed structural analysis of Mg-Ti-H thin films reveals the presence of a chemically partially segregated but structurally coherent metastable phase. By combining X-Ray Diffraction and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy on MgyTi1-yHx thin films we find non-zero Chemical Short-Range Order (CSRO) parameters for all the compositions measured. Despite the positive enthalpy of mixing of Mg and Ti the degree of ordering does not increase upon loading and unloading with hydrogen. The robustness of this system and the fast and reversible kinetics of hydrogen loading and unloading are caused by the formation of nanoscale compositional modulations in the intermetallic alloy. This microstructure is responsible for the exceptional properties of MgyTi1-yHx, thin films. It also shows that reversible metastable metal-hydrides offer new possibilities for hydrogen storage, beyond the limits imposed by thermodynamic equilibrium. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.ijhydene.2008.11.090

DO - 10.1016/j.ijhydene.2008.11.090

M3 - Article

SN - 0360-3199

VL - 34

SP - 1450

EP - 1457

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 3

ER -

Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

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