Abstract
Although the compound KSbO 3 has been reported to occur in a high temperature cubic polymorph, only the rhombohedral ilmenite phase was obtained in this study for pure material at ambient pressure and temperatures up to about 1350°C in open Pt crucibles or sealed Pt tubes. With the addition of about 2 mole percent SiO 2, B 2O 3 or other oxides of small cations a primitive cubic phase was found with a⋍9.578 A . Small single crystals of a body centered cubic phase (a=9.605A) were easily synthesized by a flux evaporation technique at about 1000°C in an open Pt crucible from a composition of about 5 mole % Sb 2O 4:95 mole % KF. The exact composition and structure of this phase (presumably K 1−xSbO 3−xF x, 0<x≤0.5) is now under investigation.
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