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The sodiation mechanism of Sn 4 P 3 was studied by ex-situ X-ray diffraction and Mössbauer effect spectroscopy. These results show that Sn 4 P 3 is initially amorphized during sodiation, and suggest that upon further sodiation both Sn and P react simultaneously with Na to form Na 3 P, Na 0.6 Sn, and Na 4 Sn 4 . Upon further sodiation, the Na-Sn phases react with Na to make Na 5 Sn 2 and Na 15 Sn 4 . These results are consistent with the behavior of Sn 4 P 3 in Li cells.
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Zheng et al. (2016) studied this question.
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