Journal of Siberian Federal University. Engineering & Technologies / Impedance Spectroscopy (BeO+TiO2)-Ceramics with Additive of TiO2 Nanoparticles

Full text (.pdf)
Issue
Journal of Siberian Federal University. Engineering & Technologies. 2019 12 (3)
Authors
Lepeshev, Anatoliy A.; Pavlov, Alexandr V.; Drokin, Nikolai A.
Contact information
Lepeshev, Anatoliy A.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Institute of Physics L.V. Kirensky SB RAS 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia; Pavlov, Alexandr V.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Institute of Physics L.V. Kirensky SB RAS 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia; ; Drokin, Nikolai A.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Institute of Physics L.V. Kirensky SB RAS 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia
Keywords
(BeO+TiO2)-ceramics; microstructure; electrophysical properties; impedance; frequency dependence; dielectric permeability; dielectric loss tangent
Abstract

The present study is aimed at obtaining electrically conductive two-component ceramics based on BeO with the addition of micro and nanocrystalline TiO2 powder. The ceramics of the composition (BeO+TiO2) is used in radio-electronic equipment as effective absorbers of microwave radiation and in other areas of modern electronics. The nature of the appearance of electrical conductivity and absorption of the microwave field in (BeO+TiO2) ceramics has not been completely established. The impedance spectroscopy method for the first time investigated the electrical and dielectric characteristics of this ceramics in the frequency range from 100 Hz to 100 MHz, depending on the presence of micro and nano-sized TiO2 phases in the composition of the BeO ceramics. It was established that the static resistance of ceramics with the addition of titanium oxide nanopowder is significantly reduced compared with the resistance of the original ceramics with TiO2 micropowder. It is shown that the real and imaginary components of the dielectric constant of the studied ceramics increase to abnormally large values when the frequency of the effective electric field decreases, and in the high frequency range f ≥ 108 Hz, the process of dielectric relaxation begins, leading to an increase in the dielectric loss tangent. The dielectric characteristics of these ceramic samples under conditions of blocking through conduction are determined

Pages
366-380
DOI
10.17516/1999-494X-0144.
Paper at repository of SibFU
http://elib.sfu-kras.ru/handle/2311/110353

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