Raman scattering study of α-MgH2 and γ-MgH 2

M. A. Kuzovnikov; V. S. Efimchenko; E. V. Filatov; A. A. Maksimov; I. I. Tartakovskii; A. J. Ramirez-Cuesta

doi:10.1016/j.ssc.2012.09.022

Raman scattering study of α-MgH₂ and γ-MgH ₂

M. A. Kuzovnikov, V. S. Efimchenko, E. V. Filatov, A. A. Maksimov, I. I. Tartakovskii, A. J. Ramirez-Cuesta

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

17 Scopus citations

Abstract

Two modifications of MgH₂ have been studied by Raman spectroscopy: α-MgH₂ with the P4₂/mnm space group and γ-MgH₂ with the Pbcn space group. The latter was prepared from α-MgH₂ by exposing it to a pressure of 5.6 GPa at 470 °C for 1.5 h. A comparison of the experimental spectra with ab-initio calculations allowed identification of a few phonon modes. A broad feature in the Raman spectrum of α-MgH₂ in the range 1470-1790 cm ^-1 was identified as the B_2g phonon mode. A Raman spectrum of γ-MgH₂ consists of five discernible peaks at 186 cm ^-1, 313 cm^-1, 509 cm^-1, 660 cm^-1, 706 cm^-1 and of three broad features in the regions 890-980 cm ^-1, 1010-1220 cm^-1 and 1240-1430 cm^-1. The peaks are identified as the 1A_g (186 cm^-1), 3B _3g (509 cm^-1), 2A_g (660 cm^-1) and 3B_1g (706 cm^-1) phonon modes.

Original language	English
Pages (from-to)	77-80
Number of pages	4
Journal	Solid State Communications
Volume	154
Issue number	1
DOIs	https://doi.org/10.1016/j.ssc.2012.09.022
State	Published - Jan 2013
Externally published	Yes

Funding

This work was supported by the Programme “ The Matter under High Energy Density ” of the Russian Academy of Sciences.

Keywords

A. Hydrides
B. High pressure
C. Raman scattering

Access to Document

10.1016/j.ssc.2012.09.022

Cite this

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title = "Raman scattering study of α-MgH2 and γ-MgH 2",

abstract = "Two modifications of MgH2 have been studied by Raman spectroscopy: α-MgH2 with the P42/mnm space group and γ-MgH2 with the Pbcn space group. The latter was prepared from α-MgH2 by exposing it to a pressure of 5.6 GPa at 470 °C for 1.5 h. A comparison of the experimental spectra with ab-initio calculations allowed identification of a few phonon modes. A broad feature in the Raman spectrum of α-MgH2 in the range 1470-1790 cm -1 was identified as the B2g phonon mode. A Raman spectrum of γ-MgH2 consists of five discernible peaks at 186 cm -1, 313 cm-1, 509 cm-1, 660 cm-1, 706 cm-1 and of three broad features in the regions 890-980 cm -1, 1010-1220 cm-1 and 1240-1430 cm-1. The peaks are identified as the 1Ag (186 cm-1), 3B 3g (509 cm-1), 2Ag (660 cm-1) and 3B1g (706 cm-1) phonon modes.",

keywords = "A. Hydrides, B. High pressure, C. Raman scattering",

author = "Kuzovnikov, \{M. A.\} and Efimchenko, \{V. S.\} and Filatov, \{E. V.\} and Maksimov, \{A. A.\} and Tartakovskii, \{I. I.\} and Ramirez-Cuesta, \{A. J.\}",

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AU - Kuzovnikov, M. A.

AU - Efimchenko, V. S.

AU - Filatov, E. V.

AU - Maksimov, A. A.

AU - Tartakovskii, I. I.

AU - Ramirez-Cuesta, A. J.

PY - 2013/1

Y1 - 2013/1

N2 - Two modifications of MgH2 have been studied by Raman spectroscopy: α-MgH2 with the P42/mnm space group and γ-MgH2 with the Pbcn space group. The latter was prepared from α-MgH2 by exposing it to a pressure of 5.6 GPa at 470 °C for 1.5 h. A comparison of the experimental spectra with ab-initio calculations allowed identification of a few phonon modes. A broad feature in the Raman spectrum of α-MgH2 in the range 1470-1790 cm -1 was identified as the B2g phonon mode. A Raman spectrum of γ-MgH2 consists of five discernible peaks at 186 cm -1, 313 cm-1, 509 cm-1, 660 cm-1, 706 cm-1 and of three broad features in the regions 890-980 cm -1, 1010-1220 cm-1 and 1240-1430 cm-1. The peaks are identified as the 1Ag (186 cm-1), 3B 3g (509 cm-1), 2Ag (660 cm-1) and 3B1g (706 cm-1) phonon modes.

AB - Two modifications of MgH2 have been studied by Raman spectroscopy: α-MgH2 with the P42/mnm space group and γ-MgH2 with the Pbcn space group. The latter was prepared from α-MgH2 by exposing it to a pressure of 5.6 GPa at 470 °C for 1.5 h. A comparison of the experimental spectra with ab-initio calculations allowed identification of a few phonon modes. A broad feature in the Raman spectrum of α-MgH2 in the range 1470-1790 cm -1 was identified as the B2g phonon mode. A Raman spectrum of γ-MgH2 consists of five discernible peaks at 186 cm -1, 313 cm-1, 509 cm-1, 660 cm-1, 706 cm-1 and of three broad features in the regions 890-980 cm -1, 1010-1220 cm-1 and 1240-1430 cm-1. The peaks are identified as the 1Ag (186 cm-1), 3B 3g (509 cm-1), 2Ag (660 cm-1) and 3B1g (706 cm-1) phonon modes.

KW - A. Hydrides

KW - B. High pressure

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