Summary
Light green to nearly colourless crystals of PbFe[AsO4][AsO3(OH)] were synthesized under moderate hydrothermal conditions (a=4.846(2),b=8.482(4),c=15.560(6) Å, β=92.82(3)°, space group P21/n, Z=4). For a single-crystal structure determination, 110 variable parameters were refined toR=0.042,R w=0.031 (1545 X-ray reflections withF 0 >3σ(F 0) and sinϑ/λ⩽70°). The crystal structure is characterized by a three-dimensional corner-connection of the FeO6 octahedra with the arsenate tetrahedra and the protonated arsenate groups. Each two PbO7 polyhedra are edge-connected to Pb2O12 dimers which are located within interstitial holes.
Zusammenfassung
Hellgrüne bis nahezu farblose Kristalle von PbFe[AsO4][AsO3(OH)] wurden unter niedrig-hydrothermalen Bedingungen synthetisiert (a=4.846(2),b=8.482(4),c=15.560(6) Å, β=92.82(3)°, Raumgruppe P21/n, Z=4). Für die Einkristall-Strukturbestimmung wurden 110 freie Parameter aufR=0.042,R w=0.031 verfeinert (1545 Röntgenbeugungsreflexe mitF 0 >3σ(F 0) und sinϑ/λ⩽70°). Die Kristallstruktur wird durch eine dreidimensionale Ecken-Verknüpfung der FeO6-Oktaeder mit den Arsenattetraedern und den protonierten Arsenatgruppen charakterisiert. Jeweils zwei PbO7-Polyeder sind über eine Kante zu Pb2O12-Dimeren verknüpft, die in Zwischenräumen angeordnet sind.
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Effenberger, H., Hejny, C. & Pertlik, F. The crystal structure of PbFe[AsO4][AsO3(OH)]. Monatsh Chem 127, 127–133 (1996). https://doi.org/10.1007/BF00807393
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DOI: https://doi.org/10.1007/BF00807393