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michael kors skor ..
DiscussionThe high resolution atomic images provide a direct evidence on the different atomic occupancies of Li and Na in Fe2(MoO4)3 from the repeating Fe2(MoO4)3 unit of ellipse along the [001] projection in the partially lithiated and sodiated Fe2(MoO4)3. The existence of biphasic domains and the lithium occupancy near four of the Mo 8d sites taking a discrete manor (all empty or all occupied) during the discharge process of Li/Fe2(MoO4)3 cell are confirmed. The new formed Li2Fe2(MoO4)3 phase is revealed with four Li 8d sites occupying both sides of ellipse configuration in symmetric distribution apart from the original Fe2(MoO4)3 phase. In contrast, the single phase domains with various compositions were observed at the different discharge states of Na/Fe2(MoO4)3 cell. Four Na 8d vacancies in the ellipse configuration are occupied one by one during the discharge process. According to the structural characteristics of Fe2(MoO4)3, its unit of ellipse along the [001] projection can hold four A atoms distributed on both sides of ellipse configuration. The electrochemical intercalated Li ions capture all four sites simultaneously to form Li2Fe2(MoO4)3 at the different discharge states. This feature can be depicted as a "discrete occupation" path (shown in Fig. 6) that defines that the Li occupation for the four available 8a sites is either all empty or all occupied, in forming the Li2Fe2(MoO4)3. The amount of Li2Fe2(MoO4)3 phase increases with increasing Li content at the expense of Fe2(MoO4)3 phase. In contrast, Na ion intercalation in Fe2(MoO4)3 can be described as a "pseudo continuous occupation" path, where Na ions progr?och ersattarna som gor ett battre jobb
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