Determination of equilibrium cations for the KTiOPO4 structure

Abstract

Single crystals with the structure of KTiOPO4 (KTP) were grown from mixtures containing equal concentrations of KSnOPO4 and KGeOPO4 (i), KTiOPO4 and KGeOPO4 (ii), and KTiOPO4 and KTiOAsO4 (iii), respectively. The comparison of the lattice parameters measured and calculated from Vegard's rule shows that structural stability of KTiOAsO4 is higher in comparison with KTiOPO4. It was found that addition of GeO2 to the KTP containing flux is accompanied by increasing all lattice parameters of KTP that correspond to substitution of As5+ by Ge4+.