S 89 Strontium diffusion in Sr3-3xLa2xx(VO4)2 solid solutions / O. N. Leonidova, I. A. Leonidov, G. I. Dontsov, A. S. Zhukovskaya // Physics of the Solid State. - 1998. - Vol. 40, № 2. - P200-203 : il. - Bibliogr. : p. 203 (10 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): СТРОНЦИЙ -- ТВЕРДЫЕ РАСТВОРЫ -- КОЭФФИЦИЕНТ ДФФУЗИИ Аннотация: Layer-by-layer radiometric analysis in the temperature range 800–950 °C was used to measure the diffusion coefficients of 90Sr, 45Ca, 133Ba radionuclides in Sr3-3xLa2x vacancy x(VO4)2 (x=50,0.1,0.15,0.2,0.25) solid solutions. It was established that DCa *> .DSr *>.DBa * . An increase in the concentrations of vacancies in the strontium sublattice leads to increased coefficients of diffusion of rare-earth metal cations. The activation energies for radionuclide diffusion were determined. It was shown that M21 cations migrate via Sr(2) positions Полный текст |