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

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Abstract

In this work, we obtained at various sintering temperatures and studied the ceramic samples of a 3-component system of barium niobate - calcium - strontium ( Ca 0,28 Ba 0,72)0,25( Sr 0,61 Ba 0,39)0,75 Nb 2 O 6 (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°С 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°С leads to the appearance of an amorphous state in the sample bulk and, as a result, to a decrease in the dielectric constant.

About the authors

Inna L. Kislova

Tver State University

Tver, Russia

Olga V. Malyshkina

Tver State University

Email: olga.malyshkina@mail.RUS
Tver, Russia

Polina. A. Ivanova

Tver State University

Tver, Russia

Alexandra I. Ivanova

Tver State University

Tver, Russia

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