000155404 001__ 155404 000155404 005__ 20240711101540.0 000155404 0247_ $$2doi$$a10.1039/c4cp03055a 000155404 0247_ $$2Handle$$a2128/9003 000155404 0247_ $$2WOS$$aWOS:000344249400049 000155404 037__ $$aFZJ-2014-04571 000155404 082__ $$a540 000155404 1001_ $$0P:(DE-Juel1)140525$$aKorte, Carsten$$b0$$eCorresponding Author$$ufzj 000155404 245__ $$aCoherency strain and its effect on ionic conductivity and diffusion in solid electrolytes - An improved model for nanocrystalline thin films and review of experimental data 000155404 260__ $$aCambridge$$bRSC Publ.$$c2014 000155404 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1438179716_993 000155404 3367_ $$2DataCite$$aOutput Types/Journal article 000155404 3367_ $$00$$2EndNote$$aJournal Article 000155404 3367_ $$2BibTeX$$aARTICLE 000155404 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000155404 3367_ $$2DRIVER$$aarticle 000155404 520__ $$aA phenomenological and analytical model for the influence of strain effects on atomic transport in columnar thin films is presented. A model system consisting of two types of crystalline thin films with coherent interfaces is assumed. Biaxial mechanical strain ε0 is caused by lattice misfit of the two phases. The conjoined films consist of columnar crystallites with a small diameter l. Strain relaxation by local elastic deformation, parallel to the hetero-interface, is possible along the columnar grain boundaries. The spatial extent δ0 of the strained hetero-interface regions can be calculated, assuming an exponential decay of the deformation-forces. The effect of the strain field on the local ionic transport in a thin film is then calculated by using the thermodynamic relation between (isostatic) pressure and free activation enthalpy ΔG#. An expression describing the total ionic transport relative to bulk transport of a thin film or a multilayer as a function of the layer thickness is obtained as an integral average over strained and unstrained regions. The expression depends only on known material constants such as Young modulus Y, Poisson ratio ν and activation volume ΔV#, which can be combined as dimensionless parameters. The model is successfully used to describe own experimental data from conductivity and diffusion studies. In the second part of the paper a comprehensive literature overview of experimental studies on (fast) ion transport in thin films and multilayers along solid–solid hetero-interfaces is presented. By comparing and reviewing the data the observed interface effects can be classified into three groups: (i) transport along interfaces between extrinsic ionic conductors (and insulator), (ii) transport along an open surface of an extrinsic ionic conductor and (iii) transport along interfaces between intrinsic ionic conductors. The observed effects in these groups differ by about five orders of magnitude in a very consistent way. 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