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- W2022248613 abstract "Abstract Al 2 F 2 GeO 4 , orthorhombic, Pnma (No. 62), a = 8.985(1) A, b = 8.521(1) A, c = 4.755(1) A, V = 364.0 A 3 , Z =4, R(P) = 0.095, R(I) = 0.061, T = 295 K. Source of material The white colored title compound was obtained by heating inti-mate mixtures of appropriate amounts of predried AlF 3 (99.9%;ALPHA), Al 2 O 3 (99.9%; ALPHA) and GeO 2 (99.9%; ALPHA)at973Kfor24hinanargonfilledsealedplatinumtube,followedby a slow cooling to room temperature. Discussion AnewoxidefluorideAl 2 GeO 4 F 2 whichisisotypictotopaz[1]andV 2 GeO 4 F 2 [2] has been prepared.TherefinementshavebeenperformedwithanorderingofOandFontheanionsitesasfoundintopazandV 2 GeO 4 F 2 .TherearethreetypesofoxygenatomsinthestructureofAl 2 GeO 4 F 2 whicharear-ranged in a close packing (cf. figure). One third of the octahedralholes are occupied by Al and one-twelfth of tetrahedral holes byGe. The Ge—O bond distances within the GeO 4 tetrahedra arerangingfrom1.732(5)Ato1.773(3)A.ItisremarkablethatintheAlO 4 F 2 octahedra the Al—F bond distances of 1.791(3) A and1.844(4)AareshorterthantheAl—Obonddistanceswhichrangefrom 1.865(4) A to 1.902(4) A. A similar situation is found forAl" @default.
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- W2022248613 date "2003-12-01" @default.
- W2022248613 modified "2023-09-27" @default.
- W2022248613 title "Crystal structure of dialuminum difluorotetraoxogermanate, Al2GeO4F2" @default.
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- W2022248613 doi "https://doi.org/10.1524/ncrs.2003.218.jg.298" @default.
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