A new form of CdTeO revealing dimorphism.

Phase-formation studies in the system CdO-TeO using a CsCl/NaCl melt at comparatively low temperatures revealed that tricadmium orthotellurate(VI), CdTeO, is dimorphic. The new modification of CdTeO is denoted as the β-form and adopts the rhombohedral MgTeO structure type with one Cd and two O sites in general positions, and two Te sites with site symmetry each. In comparison with the previously reported monoclinic cryolite-type α-form that was prepared at higher temperatures, β-CdTeO has a much lower density and most likely represents a metastable modification. Whereas the [TeO] octa-hedra in both polymorphs are very similar and show only minor deviations from ideal values, the polyhedra around the Cd sites are different, with a distorted [CdO] octa-hedron in both modifications but an additional [CdO] polyhedron with a [4 + 4] coordination in the α-form.