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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/℃。
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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).
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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:
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参考文献:
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