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Vibrational propert...
Vibrational properties of -KSiH3 and -RbSiH3 : a combined Raman and inelastic neutron scattering study
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- Mink, Janos (författare)
- Magyar Tudomanyos Akademia,Hungarian Academy of Sciences
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- Lin, Yuan-Chih, 1987 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Karlsson, Maths, 1978 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Österberg, Carin, 1987 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Udovic, Terrence J. (författare)
- National Institute of Standards and Technology (NIST)
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- Fahlquist, Henrik (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Häussermann, Ulrich (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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(creator_code:org_t)
- 2016-08-15
- 2017
- Engelska.
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 48:2, s. 284-291
- Relaterad länk:
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- The hydrogen storage materials ASiH(3) (A=K and Rb) represent complex metal hydrides built from metal cations and pyramidal SiH3- ions. At room temperature, SiH3- moieties are randomly oriented because of dynamical disorder (-modifications). At temperatures below 200K, ASiH(3) exist as ordered low-temperature () modifications. The vibrational properties of -ASiH(3) were characterized by a combination of Raman spectroscopy and inelastic neutron scattering. Internal modes of SiH3- are observed in the spectral range 1800-1900cm(-1) (stretching modes) and 890-1000cm(-1) (bending modes). External modes are observed below 500cm(-1). Specifically, SiH3- librations are between 300-450cm(-1) and 270-400cm(-1) for A=K and Rb, respectively, SiH3- translations are between 95 and 160cm(-1), K+ translations are in the range 60-100cm(-1) and Rb+ translations in the range 50-70cm(-1). The red-shift of libration modes for A=Rb is associated with a 15-30% reduction of the libration force constants of SiH3- ions in -RbSiH3. This correlates with a lower temperature for the - order-disorder phase transition (278 vs 298K). Libration modes become significantly anharmonic with increasing temperature but are maintained up to at least 200K. The vibrational properties of ASiH(3) compare well to those of alkali metal borohydrides ABH(4) (A=Na-Cs).
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- complex metal hydrides
- alkali metal silanides
- inelastic neutron scattering
- libration modes
- order-disorder phase transition
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- ref (ämneskategori)
- art (ämneskategori)
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