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Quantitative atom column position analysis at the incommensurate interfaces of a (PbS)_{1.14}NbS_{2} misfit layer comound with aberration-corrected HRTEM

February 2, 2011

by Magnus Garbrecht, Erdmann Spieker, Karsten Tillmann and Wolfgang Jäger

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Aberration-corrected HRTEM has been applied to explore the potential of NCSI contrast imaging to quantitatively analyse the complex atomic structure of misfit layered compounds and their incommensurate interfaces. Using the (PbS)_{1.14}NbS_{2} misfit layered compound as a model system it is demonstrated that atom column position analyses at the incommensurate interfaces can be performed with precisions reaching a statistical accuracy of ±6 pm. The procedure adopted for these studies compares experimental images taken from compound regions free of defects and interface modulations with a structure model derived from XRD experiments and with multi-slice image simulations for the corresponding NCSI contrast conditions used. The high precision achievable in such experiments is confirmed by a detailed quantitative analysis of the atom column positions at the incommensurate interfaces from an atom column position analysis in [010]_{PbS} zone axis images, proving a tetragonal distortion of the monochalcogenide sublattice. Comparison of the statistically averaged data obtained from the local column contrast analysis with the average tetragonal distortion determined from X-ray diffraction experiments shows satisfactory agreement

Further reading:

Magnus Garbrecht, Erdmann Spieker, Karsten Tillmann and Wolfgang Jäger: Quantitative atom column position analysis at the incommensurate interfaces of a (PbS)_{1.14}NbS_{2} misfit layered compound with aberration-corrected HRTEM, Ultramicroscopy 111 (2011) 245-250.  

 


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