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Title: A computational study of doped olivine structured Cd2GeO4: local defect trapping of interstitial oxide ions
Authors: McSloy, Adam J.
Kelly, Paul F.
Slater, Peter R.
Panchmatia, Pooja M.
Issue Date: 2016
Publisher: © the Owner Societies 2016. Royal Society of Chemistry
Citation: MCSLOY, A. ... et al, 2016. A computational study of doped olivine structured Cd2GeO4: local defect trapping of interstitial oxide ions. Physical Chemistry Chemical Physics, 18 (37), pp.26284-26290.
Abstract: Computational modelling techniques have been employed to investigate defects and ionic conductivity in Cd2GeO4. We show due to highly unfavourable intrinsic defect formation energies the ionic conducting ability of pristine Cd2GeO4 is extremely limited. The modelling results suggest trivalent doping on the Cd site as a viable means of promoting the formation of the oxygen interstitial defects. However, the defect cluster calculations for the first time explicitly suggest a strong association of the oxide defects to the dopant cations and tetrahedral units. Defect clustering is a complicated phenomenon and therefore not trivial to assess. In this study the trapping energies are explicitly quantified. The trends are further confirmed by molecular dynamic simulations. Despite this, the calculated diffusion coefficients do suggest an enhanced oxide ion mobility in the doped system compared to the pristine Cd2GeO4.
Description: This paper is closed access until 2 September 2017.
Version: Accepted for publication
DOI: 10.1039/C6CP05436F
URI: https://dspace.lboro.ac.uk/2134/22534
Publisher Link: http://dx.doi.org/10.1039/C6CP05436F
ISSN: 1463-9084
Appears in Collections:Closed Access (Chemistry)

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