Chronopotentiometric measurements showed that the diffusivity of O2- in a melt which contained low concentrations of BaO was equal to 4.4 x 10-5cm2/s at 700C.

V.I.Shapoval, Y.K.Delimarskii, O.G.Tsiklauri: Ukrainski Khimicheski Zhurnal, 1974, 40[7], 734-7