Influence of SrTiO_3 modification on dielectric properties of Mg(Zr_(0.05)Ti_(0.95))O_3 ceramics at microwave frequency

摘要

The microwave dielectric properties and microstructures were investigated in the (1-x)Mg(Zr_(0.05)Ti_(0.95))O_(3-x)SrTiO_3 (hereafter referred to as (1-x)MZT-xST) system. The compounds were prepared via the conventional solid-state reaction. Compositions in the (1-x)Mg(Zr_(0.05)Ti_(0.95))O_(3-x)SrTiO_3 system were designed to compensate the negative temperature coefficient of the resonant frequency of Mg(Zr_(0.05)Ti_(0.95))O_3. The values displayed nonmonotonic mixture-like behavior, because the TiO_2 phase was formed in the MZT composite ceramics with increasing x. A close zero τ_f of 0.2 ppm/ C could be achieved at 0.96MZT-0.04ST with ε_r = 20.8 and Q × f= 257,000 GHz.