A. IOACHIM, M. I. TOACSAN, M. G. BANCIU, L. NEDELCU, D. GHETU, A. C. DUTU, F. VASILIU, H. V. ALEXANDRU, C. BERBECARU, G. STOICA, P. NITA
Ferroelectric Ba_1-x Sr_xTiO₃ Materials for Electrically Controlled Microwave Devices

Abstract.
The paper describes the investigations of Ba_1-x Sr_xTiO₃ ceramic materials prepared by solid-state reaction techniques. The addition of MgO and MnO₂ improves sintering process and decreases the dielectric loss. The materials exhibit a dielectric constant ε_r ~ 1000 and low loss tan δ ~ 10^-3 at microwave frequencies.