Inelastic neutron scattering studies of TbNiAlH1.4 and UNiAlH2.0 hydrides

H. N. Bordallo; A. I. Kolesnikov; A. V. Kolomiets; W. Kalceff; H. Nakotte; J. Eckert

doi:10.1088/0953-8984/15/17/310

Inelastic neutron scattering studies of TbNiAlH_1.4 and UNiAlH_2.0 hydrides

H. N. Bordallo^*, A. I. Kolesnikov, A. V. Kolomiets, W. Kalceff, H. Nakotte, J. Eckert

^*Corresponding author af dette arbejde

Abstract

The optical vibrations of hydrogen in TbNiAlH_1.4 and UNiAlH_2.0 were investigated by means of inelastic neutron scattering. The experimental data were analysed, including multiphonon neutron scattering contributions, calculated in an isotropic harmonic approximation. At least two fundamental H optical peaks were observed in TbNiAlH_1.4, and were assigned to the vibrational modes of hydrogen atoms occupying different interstitial sites in the metal sublattice. The high-energy part of the UNiAlH_2.0 spectra is characterized by strong anharmonicity, and a broad fundamental band. The latter can be accounted for by a large dispersion of phonon modes due to the strong H-H interactions, and/or different metal-hydrogen force constants, which may originate from different metal atoms surrounding the H atoms in the unit cell.

Originalsprog	Engelsk
Tidsskrift	Journal of Physics Condensed Matter
Vol/bind	15
Udgave nummer	17
Sider (fra-til)	2551-2559
Antal sider	9
ISSN	0953-8984
DOI	https://doi.org/10.1088/0953-8984/15/17/310
Status	Udgivet - 7 maj 2003
Udgivet eksternt	Ja

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Citationsformater

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title = "Inelastic neutron scattering studies of TbNiAlH1.4 and UNiAlH2.0 hydrides",

abstract = "The optical vibrations of hydrogen in TbNiAlH1.4 and UNiAlH2.0 were investigated by means of inelastic neutron scattering. The experimental data were analysed, including multiphonon neutron scattering contributions, calculated in an isotropic harmonic approximation. At least two fundamental H optical peaks were observed in TbNiAlH1.4, and were assigned to the vibrational modes of hydrogen atoms occupying different interstitial sites in the metal sublattice. The high-energy part of the UNiAlH2.0 spectra is characterized by strong anharmonicity, and a broad fundamental band. The latter can be accounted for by a large dispersion of phonon modes due to the strong H-H interactions, and/or different metal-hydrogen force constants, which may originate from different metal atoms surrounding the H atoms in the unit cell.",

author = "Bordallo, {H. N.} and Kolesnikov, {A. I.} and Kolomiets, {A. V.} and W. Kalceff and H. Nakotte and J. Eckert",

year = "2003",

month = may,

day = "7",

doi = "10.1088/0953-8984/15/17/310",

language = "English",

volume = "15",

pages = "2551--2559",

journal = "Journal of Physics: Condensed Matter",

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TY - JOUR

T1 - Inelastic neutron scattering studies of TbNiAlH1.4 and UNiAlH2.0 hydrides

AU - Bordallo, H. N.

AU - Kolesnikov, A. I.

AU - Kolomiets, A. V.

AU - Kalceff, W.

AU - Nakotte, H.

AU - Eckert, J.

PY - 2003/5/7

Y1 - 2003/5/7

N2 - The optical vibrations of hydrogen in TbNiAlH1.4 and UNiAlH2.0 were investigated by means of inelastic neutron scattering. The experimental data were analysed, including multiphonon neutron scattering contributions, calculated in an isotropic harmonic approximation. At least two fundamental H optical peaks were observed in TbNiAlH1.4, and were assigned to the vibrational modes of hydrogen atoms occupying different interstitial sites in the metal sublattice. The high-energy part of the UNiAlH2.0 spectra is characterized by strong anharmonicity, and a broad fundamental band. The latter can be accounted for by a large dispersion of phonon modes due to the strong H-H interactions, and/or different metal-hydrogen force constants, which may originate from different metal atoms surrounding the H atoms in the unit cell.

AB - The optical vibrations of hydrogen in TbNiAlH1.4 and UNiAlH2.0 were investigated by means of inelastic neutron scattering. The experimental data were analysed, including multiphonon neutron scattering contributions, calculated in an isotropic harmonic approximation. At least two fundamental H optical peaks were observed in TbNiAlH1.4, and were assigned to the vibrational modes of hydrogen atoms occupying different interstitial sites in the metal sublattice. The high-energy part of the UNiAlH2.0 spectra is characterized by strong anharmonicity, and a broad fundamental band. The latter can be accounted for by a large dispersion of phonon modes due to the strong H-H interactions, and/or different metal-hydrogen force constants, which may originate from different metal atoms surrounding the H atoms in the unit cell.

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DO - 10.1088/0953-8984/15/17/310

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JO - Journal of Physics: Condensed Matter

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