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Monoclinic structure and nonstoichiometry of `KAlSiO4O1'

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Crystals of KAlSiO4O1 (potassium aluminium silicate) were synthesized using a flux method and analysed utilizing single‐crystal X‐ray diffraction and electron microprobe analysis. Both methods confirm that the crystals are nonstoichiometric according to K1−x Al1−x Si1+x O4 with x = 0.04 (1). KAlSiO4O1 is closely related to the stuffed derivatives of tridymite, although the topology of the Si/Al‐ordered framework is different. Six‐membered rings of UUDDUD and UUUDDD (U = up and D = down; ratio 2:1) configurations are present in layers parallel to the ab plane. In contrast, the framework of tridymite exhibits UDUDUD rings. The crystals are affected by inversion, pseudo‐orthorhombic and pseudo‐hexagonal twinning.
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Document Type: Research Article

Publication date: April 15, 2013

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