【摘要】 研究了 SnO₂对 ZnO-Nb₂O-5-TiO₂陶瓷相结构和微波介电性能的影响。随 Sn 添加量的增加,晶相组成逐步从(Zn_0.15Nb_0.30Ti_0.55)O2相转变为 ZnTiNb₂O₈相,相对介电常数 ?r减少,?f向负频率温度系数方向移动, 当 Sn 含量增加到0.20,?f可降至 9.8×10–6℃–1。当 SnO2的摩尔比 y 为 0^<0.08 时,形成完全固溶体,提高 Q·f 值;当 y>0.08,部分Sn 形成第 2 相,降低其 Q·f 值。当 y 为 0.08,在 1 150℃烧结,具有很好的微波介电性能,其 ?r为 50.3,Q·f 为 14 892GHz,?f为 25.12×10-6℃–1。更多还原

【Abstract】 Phase structure and microwave dielectric properties of ZnO-Nb₂O₅-TiO₂ ceramics doped with SnO₂ were investigated. When Sn increased, phase (Zn_0.15Nb_0.30Ti_0.55)O2 transforms to phaseZnTiNb₂O₈, the relative dielectric constant （?r） decreased,and the temperature cofficient of resonant frequency （?f） moved to a negative direction. ?f decreased to 9.8×10–6 ℃–1 when y = 0.20. Sn4+ could substitute Ti4+ equivantly, formed solid solution completely ,and improved the Q·f value when y<0.08. However,Q·f decreased for part of Sn formed second phase when y>0.08. At y = 0.08,when sintered at 1 150℃, had good dielectric properties of ?r=50.3,Q·f = 14 892 GHz,and ?f= 25.12×10–6℃–1.更多还原