Electrical and dielectric properties of yttrium–iron ferrite garnet polycrystals grown by the radiation–thermal sintering technology

In this paper the electrical and dielectric properties of polycrystalline yttrium iron garnet, obtained by the radiation-thermal sintering technology in a fast electron beam were investigated. Spectra of complex dielectric constant, dielectric loss tangent and conductivity were measured in the frequency range 25 – 1 MHz. For comparison, DC resistance measurements were also performed. The temperature dependences of the above parameters were measured at frequencies of 1 kHz, 100 kHz in the range 25 – 300$^\circ$C. It is shown, that conduction activations energy, permittivity, loss tangent and resistance vary significantly from sintering temperature in the range of 1300 to 1450$^\circ$C. It is found that with an increase in the sintering temperature to 1450$^\circ$C, dielectric properties are the same as samples made by the traditional ceramic technology.