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- W2044673224 abstract "Nanocomposites of lithium fluoride and transition metals have been proposed for use as positive electrode materials in lithium ion batteries. The interface between the two phases is thought to play a very important role in the electrochemical activities of these nanocomposites. In this paper, two Fe/insulator multilayer systems were prepared and investigated by means of small angle x-ray scattering (SAXs), x-ray diffraction and 57Fe M?ssbauer spectroscopy measurements. These samples consist of wedges of Fe (between 0 and 1.5?nm thickness) separated by a 2.1?nm constant thickness Al2O3 spacer and wedges of Fe (between 0 and 2.0?nm thickness) separated by a 1.6?nm constant thickness LiF spacer. For both Al2O3/Fe and LiF/Fe multilayers, SAXs shows Bragg peaks due to modulated superstructures. For the Al2O3/Fe multilayers, 57Fe M?ssbauer spectra show that three types of Fe exist within the interface region between Fe and amorphous Al2O3 layers: ?-Fe with a face centered cubic structure, Fe in interstitial sites within amorphous alumina and an Fe2+ species, much like FeAl2O4. For the LiF/Fe multilayers, 57Fe M?ssbauer spectra show that an interfacial region about 0.2?0.3?nm wide exists between the LiF and Fe layers. The data suggest that the Li:F ratio is less than 1 within the interface region, as expected due to 'sharing' of the electronegative F atoms by the two cations. The excess Li ions and electrons are thought to be stored on either side of the interface by a mechanism proposed by Maier and co-workers." @default.
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- W2044673224 date "2008-01-14" @default.
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- W2044673224 title "A Mössbauer effect study of combinatorially prepared Al<sub>2</sub>O<sub>3</sub><i>/</i>Fe and LiF/Fe multilayers" @default.
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- W2044673224 doi "https://doi.org/10.1088/0953-8984/20/05/055203" @default.
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