【作者】 戴维迪； 靳正国； 程志捷； 于晓东；

【Author】 DAI Wei-di;JIN Zheng-guo;CHENG Zhi-jie;YU Xiao-dong School of Materials Science and Engineering, Tianjin University Tianjin, 300072, China

【机构】 天津大学材料学院无机非金属系；

【摘要】 本文研究了钨青铜结构的Ba_6-3rPr_8+2xTi₁₈O₅₄系高介微波陶瓷材料,BaO:Pr₂O₃:TiO₂摩尔比为1:1:4。通过引入Bi₂O₃、Nb₂O₅、ZnO等添加改性,考查了其对Ba_6-3xPr_8+2xTi₁₈O₅₄基陶瓷微波性能的影响,实验结果表明:在1KHz、10KHz、1MHz、20MHz的不同频率下,在Bi含量达到24mol%时,相对介电常数ε_r达到最大值。用5.6mol%Nb₂O₅、11.8mol%Bi₂O₃+8.3mol%Nb₂O₅、27.2mol%ZnO+5.6mol%Nb₂O₅分别进行改性后,Nb能在一定程度上提高介电常数,而损耗略大;Bi、Nb同时掺杂能大幅度提高介电常数,但明显增大损耗与温度系数;Zn、Nb改性后,材料的介电常数和谐振品质因数值均较小。该系统具有随频率增加而下降的介电常数频率特性。更多还原

【Abstract】 Dielectric Properties of tungsten-bronze type BaPr₂Tu₄O12 microwave ceramics were investigated by addingBi₂O₃, Nb₂O₅ and Zno as additives. The optimum properties were obtained with the content of Bi³⁺ up to 20mol% at1KHz,10KHz, 1MHz,20MHz. Nb₂O₅ addition increased permittivity and decreased Q-value. The dielectric propertiesof the samples with Bi₂O₃ and Nb₂O₅ adding were similar to that of Nb₂O₅,but permittivity and Q-values decreased bycomplex additive with ZnO and Nb₂O₅.更多还原