Study of electrophysical properties of beryllium ceramics with the addition of microand nanoparticles of titanium dioxide

Abstract

In the present paper the research results of influence of nanoparticles TiO2 additions in the range 0,1 — 2,0 wt. % on electrophysical properties of oxide-beryllium ceramics (BeO + TiO2) made of micropowders are presented. The electrophysical characteristics of synthesized ceramics modified with 30 wt. % TiO2 microand nanoparticles in the electric current frequency range of 100 Hz — 100 MHz were studied by the total complex resistance method (impedance). It is known that the introduction of TiO2 addition to the BeOceramics after heat treatment in a reducing atmosphere is accompanied by a significant increase in electrical conductivity and the ability to absorb electromagnetic radiation in a wide range of frequencies. According to the results of the studies it was found that the addition of nanoparticles TiO2 into the (BeO + TiO2)-ceramics significantly reduces its static electrical resistance in comparison with the serial sample, and the specific conductivity of such ceramics significantly increases at high frequencies ~ 107 Hz. The addition of TiO2 nanoparticles significantly increases the dielectric losses of the sample sintered in the temperature range 1530 — 1550 °C. The values of real and imaginary parts of dielectric permittivity of such ceramics and the tangent of the angle of dielectric loss are two times higher compared to the serial sample — BT-30 (B — beryllium, T — titanium). The obtained results are unique in their kind, due to the experiment with a rare and strategically important material — beryllium oxide and the possibility of synthesizing new nanostructures based on it.