硅酸盐学报

Bi_2O_3及MnO_2掺杂对[(Pb,Ca)La](Fe,Nb)O_3介质陶瓷结构及微波性能的影响

作者：胡明哲周东祥姜胜林蔡雪卿龚树萍

单位：华中科技大学电子科学与技术系华中科技大学电子科学与技术系华中科技大学电子科学与技术系华中科技大学电子科学与技术系华中科技大学电子科学与技术系武汉　430074湖北大学电子科学与技术系武汉　430062 武汉　430074 武汉　430074 武汉　430074 武汉　430074

关键词：掺杂微波介质陶瓷低温烧结液相助烧剂

分类号：TQ174

出版年,卷(期):页码：2004,32(9):1128-1133

DOI：

摘要：

研究了Bi2O3及MnO2掺杂量对[(Pb0.5Ca0.5)0.92La0.08](Fe0.5Nb0.5)O3陶瓷结构及介电性能的影响。结果表明:Bi2O3及MnO2均是良好的烧结助剂,可降低体系的烧结温度60～100℃,同时提高陶瓷的密度。XRD图谱证明:当MnO2的质量分数≤2%时,陶瓷为钙钛矿相及焦绿石相,表明Mn4+进入主相晶格,而Bi2O3的掺杂会使体系中出现未知第三相。随MnO2的增加,陶瓷的介电常数先增加后减小,同时使品质因数及谐振频率温度系数的单调下降。Bi2O3的掺杂则会使陶瓷介电常数及谐振频率温度系数升高,而品质因数下降。Bi2O3及MnO2的联合掺杂比单一掺杂更有效地降低了陶瓷的烧结温度,达100～140℃,且在低温烧结条件下有比单一掺杂时更好的微波介电性能。其中当Bi2O3和MnO2的质量比k=1,2种添加物总质量分数w=1%,烧结条件为1050℃,保温4h,陶瓷的相对介电常数εr,品质因数(Q)与谐振频率(f)的乘积Qf以及谐振频率温度系数分别为91.1,4870GHz和18.5×10-6/℃。

The influences of Bi_2O_3 and MnO_(2) additives in \(Fe_(0.5)Nb_(0.5))O_(3) ceramic on the microwave properties and microstructures were investigated. Results show that the both of two additives can effectively reduce the sintering temperature by 60-100 ℃, and enhance bulk density as well. When mass fraction of MnO_(2) ≤2% only perovskite phase and pyrochlore phase exist in the ceramic, indicating the entering of Mn~(4+) into the lattice of main phase, while an unknown third phase appears in the system due to the doping of Bi_(2)O_(3). With the increase of MnO_(2) content, the dielectric constant ε_(r) firstly increases and then gradually decreases, while the temperature coefficient of resonance frequencies f and the mechanical quality factor Q decrease. As Bi_2O_3 doping ceramic sample, the dielectric constant and the temperature coefficient of resonance frequencies τ_f increase while the mechanical quality factor decreases as Bi_(2)O_(3) content increases. It is found that the co-doping of Bi_(2)O_(3) and MnO_(2) can reduce the sintering temperature effectively by 100-140 ℃ and a better microwave dielectric properties are obtained compared with the single doping. The microwave dielectric properties of the ceramic can be reached to ε_(r)=91.1,Qf=4 870 GHz and τ_(f)=18.5 × 10~(-6)/℃ for (\)(Fe_(0.5)Nb_(0.5))O_(3)ceramic added by Bi_2O_3 MnO_2 when m(Bi_2O_3)/m(MnO_2)=1, total adding amount w=1%, sintered at 1 050 ℃ for (4 h).

基金项目：

国家863计划(2001AA101C01);; 2002湖北省科技攻关tordegree.计划(2002AA101C01)资助项目。

作者简介：

参考文献：

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