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O2 demonstrated that the recoil-free fraction is equal in ferric and ferrous sites.
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1842415608
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Electronic charge carriers in ionic crystals cause significant strain on the lattice around the excess charge. This combination of the carrier and its associated strain field is the polaron. The mobility of the polaron depends on the mean drift between formation and trapping and the ease of accelerating the carrier in an electric field. Small polarons are bound to lattice sites and can only move by jumps between nearest or next-nearest neighbors, whereas large polarons are free to move in the conductance or valence band of the crystal and consequently have far higher mobilities.
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1842405007
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note
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We wish to thank N. Cohen and the University of London Intercollegiate Research Service in Mössbauer Spectroscopy for their assistance in Mössbauer analysis of samples and H. O'Neill for useful discussion in an early stage of this project. This work was supported by the Natural Environment Research Council.
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