Darstellung und Kristallstruktur von monoklinem Arsen(III)antimon(III)oxid, AsSbO₃ / Preparation and Crystal Structure of Monoclinic Arsenic(III) Antimony(III) Oxide, AsSbO₃

Monoclinic AsSbO 3 was prepared by heating an equimolar mixture of AS 2 O 3 and Sb 2 O 3 to 670 K in an evacuated quartz tube. The crystal structure was determined [P2 1 /n, a = 458(1), b = 1316(2), c = 544(1) pm, β = 95.0(1)°, Z = 4, R = 0.055 for 745 reflections] and found to be isostructural with the As 2 O 3 modification claudetite I. Mean As-O and Sb-O bond lengths are 180 and 195 pm, respectively. There is no crystallographic evidence for any significant As/Sb disorder.