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Single crystals of CdGeO 3  ilmenite have been synthesized at  p  = 10.3 GPa and  T  = 1200°C. The crystal structure of CdGeO 3  ilmenite has been determined with 781 counter-measured intensities and refined by the least-squares method to  R  = 0.048. CdGeO 3  ilmenite is trigonal with  a  = 5.0988(4) Å,  c  = 14.932(3) Å;  R [unk] and  Z  = 6. Cd 2+  and Ge 4+  ions occupy alternate basal-plane layers of cationic sites, and there is no observed disordering of Cd 2+  and Ge 4+  ions. The mean distances of Cd – O and Ge – O are 2.321 Å and 1.921 Å, respectively, in good agreement with those expected from the effective ionic radius of Cd and Ge in six-fold coordination. The height of the CdO 6  octahedra along the  c  axis is about 30% greater than that of GeO e  octahedron. Crystal-chemical analysis of the ilmenite-type compounds suggests that  c  is chiefly affected by the size of divalent cations in the ilmenite structure, while  a  is dominantly controlled by the size of the tetravalent cation. CdGeO 3  ilmenite has the largest value of  c / a  among compounds with the ilmenite structure, as a result of its largest difference in ionic radius between paired cations.

High-pressure synthesis and structural refinement of CdGeO 3 ilmenite