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Local disorder in lithium imide from density functional simulation and NMR spectroscopy


Bonnet, M L; Iannuzzi, M; Sebastiani, D; Hutter, J (2012). Local disorder in lithium imide from density functional simulation and NMR spectroscopy. Journal of Physical Chemistry C, 116(35):18577-18583.

Abstract

Born–Oppenheimer molecular dynamics simulations in combination with calculations of 1H, 7Li, and 15N NMR chemical shifts are used to characterize lithium imide structures at different temperatures. Indications of the onset of local disorder in the lithium sublattice, leading eventually to superionicity, are recognized already at low temperature (100 K). Between 100 and 400 K, a new structure could be stabilized, which presents features that are intermediate between the previously reported Fm3m̅ and the Fd3m̅ structures. The disorder in the Li positions is associated with the reorientation of the NH bonds, which preferentially point toward Li-vacant sites. Clear signatures of such structural rearrangements are visible in the simulated NMR spectra, where smoother profiles are associated with a reduced amount of Li interstitials and a higher occupation probability of the antifluorite sites.

Born–Oppenheimer molecular dynamics simulations in combination with calculations of 1H, 7Li, and 15N NMR chemical shifts are used to characterize lithium imide structures at different temperatures. Indications of the onset of local disorder in the lithium sublattice, leading eventually to superionicity, are recognized already at low temperature (100 K). Between 100 and 400 K, a new structure could be stabilized, which presents features that are intermediate between the previously reported Fm3m̅ and the Fd3m̅ structures. The disorder in the Li positions is associated with the reorientation of the NH bonds, which preferentially point toward Li-vacant sites. Clear signatures of such structural rearrangements are visible in the simulated NMR spectra, where smoother profiles are associated with a reduced amount of Li interstitials and a higher occupation probability of the antifluorite sites.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2012
Deposited On:15 Oct 2012 13:37
Last Modified:05 Apr 2016 15:59
Publisher:American Chemical Society
ISSN:1932-7447
Publisher DOI:10.1021/jp300427
Official URL:http://www.scopus.com/inward/record.url?eid=2-s2.0-84865975474&partnerID=40&md5=6dd2a268ce75a83301e20588ecb97a89
Permanent URL: http://doi.org/10.5167/uzh-65302

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