PRODUCTION OF BARIUM-CALCIUM-STRONTIUM NIOBATE CERAMICS WITH OPTIMAL PROPERTIES FOR PRACTICAL APPLICATION

In this work, we obtained at various sintering temperatures and studied the ceramic samples of a 3-component system of barium niobate - calcium - strontium (Ca0,28Ba0,72)(0,25)(Sr0,61Ba0,39)(0,75)Nb2O6 (CSBN25) which is a nanostructured solid solution. The effect of sintering temperature on the structure and dielectric properties of CSBN25 ceramics was studied. It has been established that the CSBN25 sample obtained at a sintering temperature of 1300 degrees C has the optimal ferroelectric properties. For this sample, the pore size does not exceed 10 - 100 nm, while for samples sintered at other temperatures, pores can reach 10 microns. Using examples of CSBN25 ceramics, we have also shown a direct relationship between the uniformity of the grain structure and their packing density with the dielectric properties of the samples: the maximum density and the value of the permittivity have the samples that have a dense, uniform grain structure not only on the surface, but also in the bulk of the samples. Increasing the sintering temperature of CSBN25 ceramics to1350 degrees C leads to the appearance of an amorphous state in the sample bulk and, as a result, to a decrease in the dielectric constant.