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 for this work

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.

Original language	English
Journal	Journal of Physics Condensed Matter
Volume	15
Issue number	17
Pages (from-to)	2551-2559
Number of pages	9
ISSN	0953-8984
DOIs	https://doi.org/10.1088/0953-8984/15/17/310
Publication status	Published - 7 May 2003
Externally published	Yes

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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",

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

language = "English",

volume = "15",

pages = "2551--2559",

journal = "Journal of Physics: Condensed Matter",

issn = "0953-8984",

publisher = "Institute of Physics Publishing Ltd",

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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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U2 - 10.1088/0953-8984/15/17/310

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

M3 - Journal article

AN - SCOPUS:0038137050

SN - 0953-8984

VL - 15

SP - 2551

EP - 2559

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

IS - 17

ER -

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

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