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作 者:胡明哲[1] 周东祥[1] 黄静[1] 姜胜林[1] 王浩[2] 章天金[2] 顾豪爽[2]
机构地区:[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]湖北大学物理学与电子技术学院,湖北武汉430062
出 处:《功能材料》2005年第1期60-63,共4页Journal of Functional Materials
基 金:国家高技术研究发展计划( 863 计划)资助项目( 2001AA ZB3201 02 );2002 湖北省科技攻关计划资助项目(2002AA101C01);国家自然科学基金资助项目(50371056)
摘 要:研究了烧结工艺对Bi2O3及MnO2掺杂[(Pb0.5Ca0.5)0.92 La0.08](Fe0.5 Nb0.5)O3陶瓷体系显微结构及介电性能的影响.研究表明Bi2O3及MnO2的加入可降低体系的烧结温度100~140℃,同时提高体密度.XRD图谱、SEM及微波介电性能证明950℃是最佳的煅烧温度.烧结温度对晶粒形貌有显著影响,随烧结温度的增加晶粒尺寸不断增加,但超过一定值后不断减小的气孔率又会增加.当掺杂物的质量比(Bi2O3/MnO2)K=1,掺杂物质量百分含量W=1%,烧结条件为1050℃,保温4h,体系微波介电性能可达:εr=91.1,Qf=4870GHz,τf=1.85×10-5/℃.The impact of calcining and sintering temperatures on microstructures and microwave properties in Bi2O3 and MnO2 co-doped [(Pb,Ca)La](Fe,Nb)O3 dielectric ceramics has been researched. Bi2O3 and MnO2 co-doping can effectively reduce sintering temperature by 100-140°C as well as enhance bulk densities. All of the XRD, SEM and microwave dielectric properties can verify that 950°C is the most proper calcining temperature for Bi2O3 and MnO2 co-doped [(Pb,Ca)La](Fe,Nb)O3 dielectric ceramics. The sintering temperature can significantly influence the grain size and porosity. With the increasing of sintering temperature, the grain size gradually increased while the porosity decreased until 1130°C. Higher sintering temperature would cause the evaporation of PbO in the system and the porosity increased again. When the ratio of Bi2O3/MnO2 K = 1 and co-doping content W = 1wt% and sintered at 1050°C for 4 h, the microwave dielectric properties could be: Εr = 91.1, Qf = 4870 GHz and τf = 1.85 × 10-6/°C in C(Pb0.5Ca0.5)0.92La0.08] (Fe0.5Nb0.5)O3 ceramics.
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