Atomistic simulation of point defects in ionic crystals

Show simple item record Sahariah, Munima B 2015-09-15T13:44:42Z 2015-09-15T13:44:42Z 2005
dc.identifier.other ROLL NO.974401
dc.description Supervisor: Charudatt Y Kadolkar en_US
dc.description.abstract In this thesis, we have presentrd a comprehensive study of modeling point defects in high and low symmetry crystals with Polarizable Point Ion (PPI) model. We worked out an alternate scheme to estimating energies of point defects through finite size calculations. This new method is tested for cubic NaCl crystal and is found to agree well with other existing results. Next, we studied in detail the effect of quadrupoles in the formation energy of vacancies in alkaline earth oxides using the approximate Mott-Littleton (ML) scheme. In agreement with earlier results on AgCl and AgBr, the quadrupoles are found to have substantial effect on defect energies raising a challenge to the existing dipolar models. We then worked out the PPI firmulations for low symmetry crystals, both in perfect and defect environment. A suitable set of short range potential parameters are deduced for monoclinic... en_US
dc.language.iso en en_US
dc.relation.ispartofseries TH-0260;
dc.subject PHYSICS en_US
dc.title Atomistic simulation of point defects in ionic crystals en_US
dc.type Thesis en_US

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