掺杂SrCO3对Ba4(Sm0．2Nd0．8)9．33Ti18O54微波介质陶瓷性能的影响  

Effects of SrCO_3 doping on properties of Ba_4(Sm_(0.2)Nd_(0.8))_(9.33)Ti_(18)O_(54) microwave dielectric ceramics

作　　者：陈春华[1] 沈晓冬[1] 崔升[1] 吴君[1] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第1期19-22,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(10976013);江苏省自然科学基金(BK2010082);材料化学工程国家重点实验室开放课题基金(KL11-09)

摘　　要：研究SrCO3掺杂对Ba4(Sm0.2Nd0.8)9.33Ti18O54(BSNT)材料相组成、微观结构和介电性能的影响。采用X线衍射仪(XRD)和扫描电子显微镜(SEM)表征BSNT掺杂SrCO3后陶瓷的相组成和微观结构。结果表明:SrCO3掺杂量低于4%时,SrCO3与BSNT陶瓷共熔而不产生第二相。同时发现随着SrCO3掺杂量的增加,介电常数εr和谐振频率温度系数τf近似线性增加。在BSNT陶瓷中掺杂SrCO3可以得到τf近乎于0。掺杂4%的SrCO3在1 360℃下烧结3 h,可得到介电性能最佳的BSNT陶瓷(εr=83.4,Qf=8.47 THz(4.67 GHz),τf=-2.1×10-6℃-1)。The effects of SrCO3 doping on the phase composition, microstructure and the dielectric properties of Ba4（Sm0.2Nd0.8）9.33Ti18O54（BSNT） materials were investigated. The microstructure of BSNT doped with SrCO3 was analyzed using X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Results showed that small amounts of SrCO3（ less than 4% ） could be accommodated in BSNT without a secondary phase appeared. The dielectric constant ετ and temperature coefficient of resonance frequency τf values showed an approximately linear increase with increase of additions of SrCO3. It was observed that τf（near zero） could be achieved with the addition of SrCOz to BSNT ceramics. With 4% SrCO3 addition and sintered at 1 360℃ for 3 h, BSNT ceramics exhibited excellent dielectric properties （ετ=81. 5, Qf=8.47 THz（4. 67 GHz） and Tf=-2.1×10^-6℃^-1）.

关 键 词：微波介质陶瓷 SrCO3掺杂 Ba4(Sm0 2Nd0 8)9 33Ti18O54 介电性能 

分 类 号：TM28[一般工业技术—材料科学与工程]