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In this paper we have used our recently developed ab initioWannier-function-based methodology to perform extensive Hartree-Fock andcorrelated calculations on Li$_{2}$O and LiCl to compute their Born effectivecharges. Results thus obtained are in very good agreement with the experiments.In particular, for the case of Li$_{2}$O, we resolve a controversy originatingin the experiment of Osaka and Shindo {[}Solid State Commun. 51 (1984) 421] whohad predicted the effective charge of Li ions to be in the range 0.58--0.61, avalue much smaller compared to its nominal value of unity, thereby, suggestingthat the bonding in the material could be partially covalent. We demonstratethat effective charge computed by Osaka and Shindo is the Szigeti charge, andonce the Born charge is computed, it is in excellent agreement with ourcomputed value. Mulliken population analysis of Li$_{2}$O also confirms ionicnature of the bonding in the substance.

Ab initio Wannier-function-based correlated calculations of Born effective charges of crystalline Li$_{2}$O and LiCl