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Sökning: onr:"swepub:oai:DiVA.org:su-141587" > Investigation of th...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00005270naa a2200529 4500
001oai:DiVA.org:su-141587
003SwePub
008170407s2017 | |||||||||||000 ||eng|
009oai:research.chalmers.se:dd2c92bb-0c79-4606-9b52-1bcc7309e644
024a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1415872 URI
024a https://doi.org/10.1021/acs.jpcc.6b129022 DOI
024a https://research.chalmers.se/publication/2490992 URI
040 a (SwePub)sud (SwePub)cth
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a Nedumkandathil, Rejiu Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University4 aut0 (Swepub:su)rnedu
2451 0a Investigation of the Order–Disorder Rotator Phase Transition in KSiH3 and RbSiH3
264 c 2017-02-24
264 1b American Chemical Society (ACS),c 2017
338 a print2 rdacarrier
520 a The β–α (order–disorder) transition in the silanides ASiH3 (A = K, Rb) was investigated by multiple techniques, including neutron powder diffraction (NPD, on the corresponding deuterides), Raman spectroscopy, heat capacity (Cp), solid-state 2H NMR spectroscopy, and quasi-elastic neutron scattering (QENS). The crystal structure of α-ASiH3 corresponds to a NaCl-type arrangement of alkali metal ions and randomly oriented, pyramidal, SiH3– moieties. At temperatures below 200 K ASiH3 exist as hydrogen-ordered (β) forms. Upon heating the transition occurs at 279(3) and 300(3) K for RbSiH3 and KSiH3, respectively. The transition is accompanied by a large molar volume increase of about 14%. The Cp(T) behavior is characteristic of a rotator phase transition by increasing anomalously above 120 K and displaying a discontinuous drop at the transition temperature. Pronounced anharmonicity above 200 K, mirroring the breakdown of constraints on SiH3– rotation, is also seen in the evolution of atomic displacement parameters and the broadening and eventual disappearance of libration modes in the Raman spectra. In α-ASiH3, the SiH3– anions undergo rotational diffusion with average relaxation times of 0.2–0.3 ps between successive H jumps. The first-order reconstructive phase transition is characterized by a large hysteresis (20–40 K). 2H NMR revealed that the α-form can coexist, presumably as 2–4 nm (sub-Bragg) sized domains, with the β-phase below the phase transition temperatures established from Cp measurements. The reorientational mobility of H atoms in undercooled α-phase is reduced, with relaxation times on the order of picoseconds. The occurrence of rotator phases α-ASiH3 near room temperature and the presence of dynamical disorder even in the low-temperature β-phases imply that SiH3– ions are only weakly coordinated in an environment of A+ cations. The orientational flexibility of SiH3– can be attributed to the simultaneous presence of a lone pair and (weakly) hydridic hydrogen ligands, leading to an ambidentate coordination behavior toward metal cations.
650 7a NATURVETENSKAPx Kemix Materialkemi0 (SwePub)104032 hsv//swe
650 7a NATURAL SCIENCESx Chemical Sciencesx Materials Chemistry0 (SwePub)104032 hsv//eng
650 7a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng
653 a Zintl phases
653 a Metal hydrides
653 a Neutron powder diffraction
653 a Materials Chemistry
653 a materialkemi
700a Jaworski, Aleksanderu Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University4 aut0 (Swepub:su)ajawo
700a Fischer, Andreasu Universität Augsburg,University of Augsburg4 aut
700a Österberg, Carin,d 1987u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)ocarin
700a Lin, Yuan-Chih,d 1987u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)yuanchih
700a Karlsson, Maths,d 1978u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)maths
700a Grins, Jekabsu Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University4 aut0 (Swepub:su)mat
700a Pell, Andrew J.u Stockholms universitet,Institutionen för material- och miljökemi (MMK)4 aut0 (Swepub:su)apell
700a Edén, Mattiasu Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University4 aut0 (Swepub:su)eden
700a Häussermann, Ulrichu Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University4 aut0 (Swepub:su)ulrich
710a Stockholms universitetb Institutionen för material- och miljökemi (MMK)4 org
773t The Journal of Physical Chemistry Cd : American Chemical Society (ACS)g 121:9, s. 5241-5252q 121:9<5241-5252x 1932-7447x 1932-7455
856u https://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.6b12902
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141587
8564 8u https://doi.org/10.1021/acs.jpcc.6b12902
8564 8u https://research.chalmers.se/publication/249099

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