摘要
Microstructure and dielectric tunable properties of SrO(Sr<sub>1鈭?em>xsub>Ba<sub>xsub>TiO<sub>3sub>)<sub>nsub> (x = 0 and 0.5, n = 1-4) microwave ceramics prepared through solid-state reactions have been investigated. For SrO(SrTiO<sub>3sub>)<sub>nsub> series, Sr<sub>2sub>TiO<sub>4sub> can be isolated as single phase in n = 1 product and Sr<sub>4sub>Ti<sub>3sub>O<sub>10sub> appears in the n 鈮?#xA0;2 cases as either a major phase (n = 3, 4) or a second phase (n = 2). Ba<sup>2+sup> substitution for Sr<sup>2+sup> causes the formation of SrTiO<sub>3sub> and Ba<sub>xsub>Sr<sub>2 鈭?#xA0;xsub>TiO<sub>4sub>. SrO(Sr<sub>1鈭?em>xsub>Ba<sub>xsub>TiO<sub>3sub>)<sub>nsub> (n = 1, 2) have no dielectric non-linear behavior in the temperature range of 鈭?65 to 50 掳C. As n increases, the tunability increases. As a result, Ba<sup>2+sup> substitution for Sr<sup>2+sup> results in an increase in permittivity and tunability, but a decrease in Q value.