Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.1007/s11148-022-00728-3
Ключевые слова: (BeO + TiO2) ceramics, electrophysical properties, activation energy of electrical resistivity, impedance spectroscopy, dielectric permittivity, TiO2 nanopowder
Аннотация: The electrophysical properties of BeO-based ceramics with introduced micro- and nanoparticles of TiO2 were investigated by impedance spectroscopy in the frequency range of 100 Hz – 100 MHz. In order to increase the density and conductivity, the initial ceramic components were sintered at the highest possible temperatures up to 1660Показать полностью°C, followed by annealing in hydrogen at 800°C. In this case, TiO2 was strongly reduced with the formation of lower titanium oxides (Ti3O5) along with metallic titanium. When interacting with hydrogen, TiH2 is formed. For the first time, impurity phases were found in (BeO + TiO2) ceramics, which can significantly alter its bulk and surface properties. The resulting ceramics has a high reach-through conductivity, which increases significantly after an additional thermal annealing in hydrogen. It was established that the activation energy of conductivity does not depend much on the concentration of TiO2 nanoparticles and decreases significantly in the low-temperature region. The method of constructing equivalent electrical circuits was used to simulate the passage of the active and reactive components of the current through the complex internal structure of the ceramics.
Журнал: Refractories and Industrial Ceramics
Выпуск журнала: Т.63, №3
Номера страниц: 315-320
ISSN журнала: 10834877
Место издания: Москва
Издатель: Springer New York Consultants Bureau