Vibrational properties of the gallium monohydrides SrGaGeH, BaGaSiH, BaGaGeH, and BaGaSnH

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.05.023· OSTI ID:21370522

Evans, Michael J ^[1]; Lee, Myeong H ^[2]; Holland, Gregory P ^[1]; Daemen, Luke L ^[3]; Sankey, Otto F ^[2]; Haeussermann, Ulrich ^[1]

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1. Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604, Tempe, AZ 85287-1604 (United States)
2. Department of Physics, Arizona State University, P.O. Box 871504, Tempe, AZ 85287-1504 (United States)
3. Lujan Neutron Scattering Center, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545 (United States)

Vibrational properties of the gallium monohydrides SrGaGeH, BaGaSiH, BaGaGeH, and BaGaSnH (AeGaTtH) have been investigated by means of inelastic neutron scattering (INS) and first principles calculations. The compounds contain separated Ga-H units being part of a two dimensional polyanionic layer, [TtGaH]{sup 2-} (Tt=Si, Ge, Sn). The INS spectra show internal Ga-H bending and stretching modes at frequencies around 900 and 1200 cm{sup -1}, respectively. While the stretching mode is virtually invariant with respect to the variable chemical environment of the Ga-H unit, the bending mode frequency varies and is highest for BaGaSiH and lowest for BaGaSnH. The stretching mode is a direct measure of the Ga-H bond strength, whereas the bending mode reflects indirectly the strength of alkaline earth metal-hydrogen interaction. Accordingly, the terminal Ga-H bond in solid state AeGaTtH is distinct, but-compared to molecular gallium hydrides-very weak. - Graphical abstract: Vibrational properties of the gallium monohydrides SrGaGeH, BaGaSiH, BaGaGeH, and BaGaSnH have been investigated and revealed Ga-H stretching mode frequencies around 1200 cm{sup -1}. This implies that the terminal Ga-H bond in solid state polyanionic gallium hydrides is very weak compared to molecular gallium hydride species.

• OSTI ID: 21370522
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 8; Other Information: DOI: 10.1016/j.jssc.2009.05.023; PII: S0022-4596(09)00233-3; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALINE EARTH METALS
BARIUM COMPOUNDS
GALLIUM COMPOUNDS
GERMANIUM COMPOUNDS
HYDRIDES
INELASTIC SCATTERING
INTERACTIONS
NEUTRON DIFFRACTION
SILICON COMPOUNDS
SPECTRA
SPECTROSCOPY
STRONTIUM COMPOUNDS
TIN COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
HYDROGEN COMPOUNDS
METALS
SCATTERING