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Ab initio Wannier-function-based correlated calculations of Born effective charges of crystalline Li(2)O and LiCl

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Title Ab initio Wannier-function-based correlated calculations of Born effective charges of crystalline Li(2)O and LiCl
 
Creator SONY, P
SHUKLA, A
 
Subject hartree-fock
lithium hydride
polarization
solids
phase
oxide
lif
 
Description In this paper, we have used our recently developed ab initio Wannier-function-based methodology to perform extensive Hartree-Fock and correlated calculations on Li(2)O and LiCl to compute their Born effective charges. Results thus obtained are in very good agreement with the experiments. In particular, for the case of Li(2)O, we resolve a controversy originating in the experiment of Osaka and Shindo [Solid State Commun. 51, 421 (1984)] who had predicted the effective charge of Li ions to be in the range of 0.58-0.61, a value much smaller compared to its nominal value of unity, thereby, suggesting that the bonding in the material could be partially covalent. We demonstrate that effective charge computed by Osaka and Shindo is the Szigeti charge, and once the Born charge is computed, it is in excellent agreement with our computed value. Mulliken population analysis of Li(2)O also confirms ionic nature of the bonding in the substance.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-16T19:28:26Z
2011-12-26T12:49:55Z
2011-12-27T05:35:45Z
2011-07-16T19:28:26Z
2011-12-26T12:49:55Z
2011-12-27T05:35:45Z
2008
 
Type Article
 
Identifier PHYSICAL REVIEW B, 77(7), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.77.075130
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4511
http://hdl.handle.net/10054/4511
 
Language en