Serial-sectioning and radio-tracer techniques were used to monitor the diffusion of 90Sr, 45Ca and 133Ba in Sr 3-3x La2xx(VO4)2 solid solutions, where x ranged from 0 to 0.25. It was found that the diffusivities decreased in the order: Ca - Sr - Ba. An increase in the vacancy concentration, , on the Sr sub-lattice led to an increase in the diffusivity of the rare-earth cations. It was shown that doubly-charged cations migrated via Sr(2) positions.

O.N.Leonidova, G.I.Dontsov, I.A.Leonidov, A.C.Zhukovskaya: Fizika Tverdogo Tela, 1998, 40[2], 223-6 (Physics of the Solid State, 1998, 40[2], 200-3