【摘要】 对 (Zn1-xMgx)TiO3 系统的微观结构和介电性能进行了研究。通过添加一定量的MgO稳定ZnTiO3 六方钛铁矿结构 ,有效抑制了ZnTiO3 分解为Zn2 TiO4 和TiO2 。同时 ,通过调整x值 (x =0 .1～ 0 .4) ,可以获得介电性能优良的微波瓷料。当x=0 .3～ 0 .3 5时 ,在 10 6 0℃烧结 ,其品质因数Q0 >2 0 0 0 0 ( 6 .5GHz) ,谐振频率温度系数τf≈ + 2× 10 - 6 /℃ ,介电常数ε =18～ 2 2。通过研究发现热处理可以改变系统微观形貌 ,其品质因数Q0 与热处理温度关系密切 ,当保温时间均为 2h时 ,随着热处理温度的升高 ,Q0 从 2 3 83 3 .93相应升高到 475 84.0 0。更多还原

【Abstract】 The microstructure and dielectric properties of (Zn_1-xMg_x)TiO₃ system were investigated. By adding the MgO in ZnOTiO₂ system,the hexagonal ilmenite structure of ZnTiO₃ was stabilized, and that the compound decomposition into Zn₂TiO₄ and rutile was restrained effectively. Through the x value adjusting（x=0.1—0.4）, the better properties of material can be obtained. While x value is between 0.3 and 0.35, the dielectric properties of (Zn_1-xMg_x)TiO₃ calcined at 1 060 ℃ are: quality factor Q₀ >20 000（6.5 GHz）,resonance-frequency temperature coefficient τ_f≈+2×10^-6/℃, dielectric constant ε=18—22. Results show that heat treatment can improve the microstructure of (Zn_1-xMg_x)TiO₃, and the Q₀ value is depended on the heat treatment temperature, with increasing the heat treatment temperature but holding the same heat treatment duration time 2 h, the Q₀ value reaches 47 584.00 from 23 833.93.更多还原