Effect of mechanical activation on the internal structure and macroresponses of a lead-free multicomponent material based on alkali metal niobates

The paper reports on the patterns of influence of mechanically activating procedures on the internal structure (crystalline, grain) and electrophysical properties of compositions based on alkali metal niobates of the type (Na$_a$K$_b$Li$_c$)(Nb$_d$Ta$_m$Sb$_n$)O$_3$ with the participation of a combined modifier (Bi$_2$O$_3$ + Fe$_2$O$_3$) and a non-isostructural compound CuNb$_2$O$_6$. It was determined, based on the results obtained, that the optimal conditions for the preparation of high-density, virtually impurity-free ceramics are mechanical activation for (10 $\div$ 15) min. It is evident that these technological conditions have the capacity to reduce dielectric losses and increase the values of macroresponses of the ceramics under investigation.