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Figure 1 Disilicate ([Si2O7]6–: top left) and orthosilicate units ([SiO4]4–: top right) as well as butterfly-shaped cationic [F2Y4]10+ entities (bottom) in the crystal structure of Y4F2[Si2O7][SiO4]; displacement ellipsoids are drawn at the 80% probability level.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 69| Part 10| September 2013| Page i71
doi:10.1107/S1600536813026391
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