Abstract
The article presents data on the study of the effect of substitutions of M-cations in the system of Na 3 Fe 2(1-x) Sc 2x (PO 4 ) 3 solid solutions (in the concentration range 0≤x≤0.06) on the crystal structure, ionic conductivity, and also on the temperature of phase transitions T a→b , T b→g . It is shown that samples of Na 3 Fe 2(1-x) Sc 2x (PO 4 ) 3 (0≤x≤0.06) solid solutions are monoclinically distorted, and the structure parameters increase linearly with increasing dopant concentration. Moreover, in the studied samples of solid solutions, an increase in the conductivity of the a -phase and a decrease in the b - and g -phases are observed, as well as a decrease in the temperatures T a→b and T b→g . It is concluded that these changes are associated with both local deformations of the anionic part of the crystalline structure, and violation of the regularity of the crystal structure