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- W2903910685 abstract "The crystal structure of the new mineral aravaite Ba 2 Ca 18 (SiO 4 ) 6 (PO 4 ) 3 (CO 3 )F 3 O [R{bar 3}m, a = 7.12550 (11), c = 66.2902 (13) Å, V = 2914.81 (8) Å 3 , Z = 3] was solved from single-crystal diffraction data, collected using synchrotron radiation at the X06DA beamline of the Swiss Light Source. The unit cell of this modular mineral contains six layers of {Ba(PO 4 ) 1.5 (CO 3 ) 0.5 } 3.5− (T-layer), three triple antiperovskite layers (tAP) {(F 2 OCa 12 )(SiO 4 ) 4 } 4+ , and three single antiperovskite layers (sAP) {(FCa 6 )(SiO 4 ) 2 } 3+ . The structure refinement confirms a model with a layer sequence of T–sAP–T–tAP as an average structure of this mineral. However, one-dimensional diffuse scattering observed parallel to c * implies imperfections in the stacking sequence of the average structure. Qualitative modelling of disorder confirms that the alternating sequence of T–sAP and T–tAP blocks is disturbed. The blocks occurring in this new mineral are known from other so-called hexagonal intercalated antiperovskite structures: T–sAP (stracherite and zadovite group), T–tAP (ariegilatite and nabimusaite group)." @default.
- W2903910685 created "2018-12-22" @default.
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- W2903910685 date "2018-12-01" @default.
- W2903910685 modified "2023-10-16" @default.
- W2903910685 title "Aravaite, Ba2Ca18(SiO4)6(PO4)3(CO3)F3O: modular structure and disorder of a new mineral with single and triple antiperovskite layers" @default.
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- W2903910685 doi "https://doi.org/10.1107/s2052520618012271" @default.
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