Crystal structure and lattice dynamics of chromium hydrides

V. E. Antonov; A. I. Beskrovnyy; V. K. Fedotov; A. S. Ivanov; S. S. Khasanov; A. I. Kolesnikov; M. K. Sakharov; I. L. Sashin; M. Tkacz

doi:10.1016/j.jallcom.2006.05.021

Crystal structure and lattice dynamics of chromium hydrides

V. E. Antonov, A. I. Beskrovnyy, V. K. Fedotov, A. S. Ivanov, S. S. Khasanov, A. I. Kolesnikov, M. K. Sakharov, I. L. Sashin, M. Tkacz

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

22 Scopus citations

Abstract

Samples of fcc (γ) CrH and hcp (ε) CrH have been prepared by cathodic electrodeposition of chromium and studied by powder neutron diffraction at 8 K and by inelastic neutron scattering (INS) at 5 K in the range of energy transfers 6-400 meV. A profile analysis of the neutron diffraction patterns showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of γ-CrH with a = 3.854(3) Å and in the hcp metal lattice of ε-CrH with a = 2.719(3) Å and c = 4.433(4) Å. No magnetic ordering was detected in either hydride at 8 K. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations in both hydrides consists of a strong peak with a broad shoulder towards higher energies. The peak position is 118 meV for γ-CrH and 122 meV for ε-CrH.

Original language	English
Pages (from-to)	22-28
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	430
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2006.05.021
State	Published - Mar 14 2007
Externally published	Yes

Funding

This work was supported by grants nos. 02-02-16859 and 05-02-17733 from the Russian Foundation for Basic Research and by the Program “Physics and Mechanics of Strongly Compressed Matter” of the Russian Academy of Sciences. Work at ANL was performed under the auspices of the US DOE-BES, contract No. W-31-109-ENG-38.

Funders	Funder number
Russian Foundation for Basic Research
Russian Academy of Sciences

Keywords

Inelastic neutron scattering
Metal hydrides
Neutron diffraction

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10.1016/j.jallcom.2006.05.021

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title = "Crystal structure and lattice dynamics of chromium hydrides",

abstract = "Samples of fcc (γ) CrH and hcp (ε) CrH have been prepared by cathodic electrodeposition of chromium and studied by powder neutron diffraction at 8 K and by inelastic neutron scattering (INS) at 5 K in the range of energy transfers 6-400 meV. A profile analysis of the neutron diffraction patterns showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of γ-CrH with a = 3.854(3) {\AA} and in the hcp metal lattice of ε-CrH with a = 2.719(3) {\AA} and c = 4.433(4) {\AA}. No magnetic ordering was detected in either hydride at 8 K. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations in both hydrides consists of a strong peak with a broad shoulder towards higher energies. The peak position is 118 meV for γ-CrH and 122 meV for ε-CrH.",

keywords = "Inelastic neutron scattering, Metal hydrides, Neutron diffraction",

author = "Antonov, {V. E.} and Beskrovnyy, {A. I.} and Fedotov, {V. K.} and Ivanov, {A. S.} and Khasanov, {S. S.} and Kolesnikov, {A. I.} and Sakharov, {M. K.} and Sashin, {I. L.} and M. Tkacz",

year = "2007",

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doi = "10.1016/j.jallcom.2006.05.021",

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volume = "430",

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T1 - Crystal structure and lattice dynamics of chromium hydrides

AU - Antonov, V. E.

AU - Beskrovnyy, A. I.

AU - Fedotov, V. K.

AU - Ivanov, A. S.

AU - Khasanov, S. S.

AU - Kolesnikov, A. I.

AU - Sakharov, M. K.

AU - Sashin, I. L.

AU - Tkacz, M.

PY - 2007/3/14

Y1 - 2007/3/14

N2 - Samples of fcc (γ) CrH and hcp (ε) CrH have been prepared by cathodic electrodeposition of chromium and studied by powder neutron diffraction at 8 K and by inelastic neutron scattering (INS) at 5 K in the range of energy transfers 6-400 meV. A profile analysis of the neutron diffraction patterns showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of γ-CrH with a = 3.854(3) Å and in the hcp metal lattice of ε-CrH with a = 2.719(3) Å and c = 4.433(4) Å. No magnetic ordering was detected in either hydride at 8 K. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations in both hydrides consists of a strong peak with a broad shoulder towards higher energies. The peak position is 118 meV for γ-CrH and 122 meV for ε-CrH.

AB - Samples of fcc (γ) CrH and hcp (ε) CrH have been prepared by cathodic electrodeposition of chromium and studied by powder neutron diffraction at 8 K and by inelastic neutron scattering (INS) at 5 K in the range of energy transfers 6-400 meV. A profile analysis of the neutron diffraction patterns showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of γ-CrH with a = 3.854(3) Å and in the hcp metal lattice of ε-CrH with a = 2.719(3) Å and c = 4.433(4) Å. No magnetic ordering was detected in either hydride at 8 K. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations in both hydrides consists of a strong peak with a broad shoulder towards higher energies. The peak position is 118 meV for γ-CrH and 122 meV for ε-CrH.

KW - Inelastic neutron scattering

KW - Metal hydrides

KW - Neutron diffraction

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DO - 10.1016/j.jallcom.2006.05.021

M3 - Article

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EP - 28

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Crystal structure and lattice dynamics of chromium hydrides

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Keywords

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