Diatoms in Oland, Sweden by Niels Foged Vaduz

By Niels Foged Vaduz

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3539 nm3, Z = 8 site Wyck. sym. x y z O1 Se2 O3 8h 8h 8g m.. m.. 63802 0 0 1 /4 occ. 019, T = 286 K Remarks: Only stable modification at ambient pressure. Space groups (94) P42212, (106) P42bc,(114) P-421c and (117) P-4b2 were tested and rejected. The effect of pressure is studied in [3]. , Galy J. (1992), Z. Kristallogr. 202, 99–107. D. (1937), J. Am. Chem. Soc. 59, 789–794. , Bouvier P. (2002), J. Solid State Chem. 168, 184–191. 1007/978-3-642-22847-6_5 # Springer-Verlag Berlin Heidelberg 2012 NH4AlF4 α-lt 1 NH4AlF4 α-lt Structure Types tP24 [NH4]AlF4 (135) P42/mbc – hfcb NH4AlF4 α-lt [1] Structural features: AlF6 octahedra (slightly rotated around [001]) share vertices to form infinite slabs; NH4 tetrahedra between the slabs.

Lett. 81, 2711–2714. [3] Schwarz U. (2004), Z. Kristallogr. 219, 376–390. 1007/978-3-642-22847-6_4 # Springer-Verlag Berlin Heidelberg 2012 SeO2 α 1 SeO2 α Structure Types tP24 SeO2 (135) P42/mbc – h2g SeO2 α [2], Strukturbericht notation C47 Structural features: Infinite zigzag chains of vertex-linked :SeO3 ψ-tetrahedra are interconnected via longer Se-O interactions to form a 3D-framework. See Fig. 1. Fig. 1. SeO2 α Arrangement of :SeO3 ψ-tetrahedra (Se atoms dark, O atoms light). For clarity, atoms located in the cell but belonging to ψ-tetrahedra with the Se atom in a neighboring cell are omitted.

203 1 occ. 066, T = 5 K Remarks: Phase stable at T < 150 K. Hydrogen atoms are not taken into consideration for Pearson symbol, Wyckoff sequence and atomic environments. L. (1982), Mater. Res. Bull. 17, 391–397. 1007/978-3-642-22847-6_6 # Springer-Verlag Berlin Heidelberg 2012 ZnSb2O4 1 ZnSb2O4 Structure Types tP28 ZnSb2O4 (135) P42/mbc – h2gd ZnSb2O4 [2]; FeSb2O4 [3], schafarzikite; CuAs2O4 [4], trippkeite Structural features: Infinite chains of edge-linked ZnO6 octahedra and infinite chains of vertex-linked :SbO3 ψ-tetrahedra share atoms to form a 3D-framework.

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