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KTiOPO 4  single crystals doped with V 2 O 4  were grown from fluxes between 1323 and 1123 K with dimensions up to (10x5x5) mm 3 . Two crystallographically inequivalent centers of VO 2+  in the occupation ratio of 10:1 were detected by EPR at room temperature. Their z axes of largest hyperfine splitting are oriented close to the directions of the very short Ti-O bonds of the two Ti in the structure. An energy difference for incorporation of VO 2+  into these two sites of -9.4+ 1.7 kJ/mol per pm difference in bond lengths was obtained from the occupation ratio, the large limits of error being mainly due to uncertainties in the bond lengths. Additional hyperfine splitting caused by  31 P nuclei as next-nearest neighbors was also resolved in most orientations.

EPR of VO 2+ in KTiOPO 4 Single Crystals