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The crystal structure of the sodium aluminium difluorosulfate NaAl(SO 4 )F 2 has been determined from laboratory powder diffraction data. Its characterization allows for improving the monitoring of aluminium industrial production starting from cryolite. It is characterized by a perovskite single layer formed by the fluorine corner-sharing of [AlF 4 O 2 ] octahedra with SO 4 groups, and sodium as the interlayer content. This could be the n = 1 member of a possible new family of 2D perovskite materials AM n (SO 4 )F 3 n –1 ( A + = Na, Li; M 3+ = Al, Fe, V, Cr), which remains to be confirmed.
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Bail et al. (2025) studied this question.
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