Hydrogen vibrations in γ-TiH and γ-ZrH under high pressure

A. I. Kolesnikov; M. A. Adams; I. O. Bashkin; E. G. Ponyatovsky

doi:10.1080/08957950008245916

Hydrogen vibrations in γ-TiH and γ-ZrH under high pressure

A. I. Kolesnikov, M. A. Adams, I. O. Bashkin, E. G. Ponyatovsky

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The effect of high hydrostatic pressure on the vibrational spectra of monohydrides γ-TiH and γ-ZrH was studied by inelastic neutron scattering, the maximum experimental pressure being, respectively, P=15 and 17.5kbar. There was observed a uniform linear pressure-induced energy shift of each spectrum compared to that at ambient pressure with proportionality factors of 1.02 for γ-TiH and 1.03 for γ-ZrH. The observed linear shift of the one-phonon hydrogen modes and the bound multiphonons (biphonons and triphonons) is indicative of a pressure-induced increase of the anharmonicity parameters in the model Hamiltonian representing the strength of two-phonon and three-phonon interactions.

Original language	English
Pages (from-to)	281-288
Number of pages	8
Journal	High Pressure Research
Volume	17
Issue number	3-6
DOIs	https://doi.org/10.1080/08957950008245916
State	Published - 2000
Externally published	Yes

Funding

The authors are grateful to Professor V. G. Glebovsky for preparation of pure Ti and Zr. We also thank ISIS for provision of neutron beam facilities. The work was supported by the RFBR Grants No. 97-02-17614 and No. 96-15-96806.

Funders	Funder number
Russian Foundation for Basic Research	96-15-96806, 97-02-17614

Keywords

Inelastic neutron scattering
Metal hydrides
Pressure

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abstract = "The effect of high hydrostatic pressure on the vibrational spectra of monohydrides γ-TiH and γ-ZrH was studied by inelastic neutron scattering, the maximum experimental pressure being, respectively, P=15 and 17.5kbar. There was observed a uniform linear pressure-induced energy shift of each spectrum compared to that at ambient pressure with proportionality factors of 1.02 for γ-TiH and 1.03 for γ-ZrH. The observed linear shift of the one-phonon hydrogen modes and the bound multiphonons (biphonons and triphonons) is indicative of a pressure-induced increase of the anharmonicity parameters in the model Hamiltonian representing the strength of two-phonon and three-phonon interactions.",

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T1 - Hydrogen vibrations in γ-TiH and γ-ZrH under high pressure

AU - Kolesnikov, A. I.

AU - Adams, M. A.

AU - Bashkin, I. O.

AU - Ponyatovsky, E. G.

PY - 2000

Y1 - 2000

N2 - The effect of high hydrostatic pressure on the vibrational spectra of monohydrides γ-TiH and γ-ZrH was studied by inelastic neutron scattering, the maximum experimental pressure being, respectively, P=15 and 17.5kbar. There was observed a uniform linear pressure-induced energy shift of each spectrum compared to that at ambient pressure with proportionality factors of 1.02 for γ-TiH and 1.03 for γ-ZrH. The observed linear shift of the one-phonon hydrogen modes and the bound multiphonons (biphonons and triphonons) is indicative of a pressure-induced increase of the anharmonicity parameters in the model Hamiltonian representing the strength of two-phonon and three-phonon interactions.

AB - The effect of high hydrostatic pressure on the vibrational spectra of monohydrides γ-TiH and γ-ZrH was studied by inelastic neutron scattering, the maximum experimental pressure being, respectively, P=15 and 17.5kbar. There was observed a uniform linear pressure-induced energy shift of each spectrum compared to that at ambient pressure with proportionality factors of 1.02 for γ-TiH and 1.03 for γ-ZrH. The observed linear shift of the one-phonon hydrogen modes and the bound multiphonons (biphonons and triphonons) is indicative of a pressure-induced increase of the anharmonicity parameters in the model Hamiltonian representing the strength of two-phonon and three-phonon interactions.

KW - Inelastic neutron scattering

KW - Metal hydrides

KW - Pressure

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EP - 288

JO - High Pressure Research

JF - High Pressure Research

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ER -

Hydrogen vibrations in γ-TiH and γ-ZrH under high pressure

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