Features of the Preparation and Study of Electrophysical Characteristics (BeO+TiO2)-Ceramics by Impedance Spectroscopy

Описание

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.1007/s11148-019-00359-1

Ключевые слова: (BeO + TiO2)-ceramic, dielectric loss tangent, dielectric permittivity, electrophysical properties, frequency dependence, impedance

Аннотация: An electrically conducting two-component BeO-ceramic with the addition of micro- and nano-crystalline TiO2 powder is prepared that can be used as a material for scattered microwave radiation absorption in high-power electronic devices. The nature of the occurrence of electrical conductivity and absorption of the microwave field in Показать полностью(BeO + TiO2)-ceramics is not completely established. Impedance spectroscopy is used for the first time to investigate the electrical and dielectric characteristics of this ceramic in the frequency range from 100 Hz to 100 MHz in relation to presence of micro- and nano-sized TiO2 phase within the BeO ceramic composition. It is established that the static resistance of ceramics with addition of a TiO2 nanopowder is significantly reduced compared with the resistance of original ceramic with TiO2 micropowder. It is shown that real and imaginary components of the dielectric constant of the ceramic studied increase to abnormally large values with a reduction in frequency of the effective electric field, and in the high frequency range f ≥ 108 Hz the process of dielectric relaxation commences leading to an increase in dielectric loss angle. Dielectric properties of ceramic samples are determined under blocking conditions for through conduction. The effect of TiO2 micropowder additions on dielectric polarization processes with frequency increasing up to 12 × 109 Hz is considered. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

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Издание

Журнал: Refractories and Industrial Ceramics

Выпуск журнала: Vol. 60, Is. 3

Номера страниц: 309-317

ISSN журнала: 10834877

Издатель: Springer

Авторы

  • Lepeshev A.A. (FGBOU VO Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Pavlov A.V. (FGBOU VO Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Drokin N.A. (FGBUN Federal Research Center, Krasnoyarsk Scientific Center, Siberian Section of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation, FGBOU VO Academician M. F. Reshetnev Siberian Aerospace University, Krasnoyarsk, Russian Federation)
  • Malkin A.I. (FGAOU VO Ural Federal University, Ekaterinburg, Russian Federation)
  • Kiiko V.S. (FGAOU VO Ural Federal University, Ekaterinburg, Russian Federation)
  • Knyazev N.S. (FGAOU VO Ural Federal University, Ekaterinburg, Russian Federation)

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