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Na 3 AlF 6 exhibits Na + conductivity by forming solid solution with Na 2 SiF 6 . The dominant conduction ion remains Na + , even in the presence of F − vacancies. The oxidation of Na 3 AlF 6 –Na 2 SiF 6 is not observed up to 5 V vs. Na + /Na, confirming its suitability as a coating material for high-voltage cathodes.
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Miyazaki et al. (2025) studied this question.
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