(1–x)Li_(1.0125)MgPO_(4–x)Ba_3(VO_4)_2复相陶瓷的制备及其微波介电性能
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摘要
采用固相烧结法制备(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_2复相陶瓷,研究了Ba_3(VO_4)_2掺杂对复相陶瓷相组成、烧结特性、显微组织和微波介电性能的影响。结果表明:(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_2陶瓷中仅存在Li_(1.0125)Mg PO_4和Ba_3(VO_4)_2相。Ba_3(VO_4)_2的添加能明显降低Li_(1.0125)MgPO_4陶瓷的烧结温度。随着Ba_3(VO_4)_2含量的增加,复相陶瓷的相对介电常数ε_r逐渐增大,品质因子Q×f逐渐减小,谐振频率温度系数τ_f由负值逐渐变为正值。通过调节x值,可获得近零的τ_f值。0.5Li_(1.0125)MgPO_4–0.5Ba_3(VO_4)_2复相陶瓷经875℃烧结2 h后具有最佳微波介电性能,即ε_r=9.72,Q×f=57 347 GHz,τ_f=-1.9×10~(-6)/℃,是一种极具潜力的低温共烧介质材料。
Composite ceramics of(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_(2 )were prepared by a conventional solid-state route.The effect of Ba_3(VO_4)_2 doping on the phase composition,sinterability,microstructure and microwave dielectric properties of Li_(1.0125)Mg PO_4ceramics was investigated.The results show that(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_2 ceramics consist of Li_(1.0125)Mg PO_4 and Ba_3(VO_4)_2phases.The addition of Ba_3(VO_4)_2 can reduce the sintering temperature of Li_(1.0125)Mg PO_4 ceramics.The relative dielectric constantε_(r )of composite ceramics incerases gradually,quality factor Q×f decreases,and the temperature coefficient of resonant frequencyτ_(f )varies from negative to positive when Ba_3(VO_4)_(2 )content increases.In addition,a near-zeroτ_f value is obtained via the adjustment of the value of x.The 0.5Li_(1.0125)Mg PO_4–0.5Ba_3(VO_4)_2 composite ceramic sintered at 875℃for 2 h has excellent microwave dielectric properties(i.e.,ε_r=9.72,Q×f=57 347 GHz,andτ_f=-1.9×10~(–6)/℃),which can be used as a promising low temperature co-firing dielectric material.
Composite ceramics of(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_(2 )were prepared by a conventional solid-state route.The effect of Ba_3(VO_4)_2 doping on the phase composition,sinterability,microstructure and microwave dielectric properties of Li_(1.0125)Mg PO_4ceramics was investigated.The results show that(1–x)Li_(1.0125)Mg PO_4–x Ba_3(VO_4)_2 ceramics consist of Li_(1.0125)Mg PO_4 and Ba_3(VO_4)_2phases.The addition of Ba_3(VO_4)_2 can reduce the sintering temperature of Li_(1.0125)Mg PO_4 ceramics.The relative dielectric constantε_(r )of composite ceramics incerases gradually,quality factor Q×f decreases,and the temperature coefficient of resonant frequencyτ_(f )varies from negative to positive when Ba_3(VO_4)_(2 )content increases.In addition,a near-zeroτ_f value is obtained via the adjustment of the value of x.The 0.5Li_(1.0125)Mg PO_4–0.5Ba_3(VO_4)_2 composite ceramic sintered at 875℃for 2 h has excellent microwave dielectric properties(i.e.,ε_r=9.72,Q×f=57 347 GHz,andτ_f=-1.9×10~(–6)/℃),which can be used as a promising low temperature co-firing dielectric material.
引文
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[12]龚志杰,王哲飞,王丽熙,等.MgSn0.05Ti0.95O3-SrTiO3复相陶瓷的显微结构与微波介电性能[J].硅酸盐学报,2013,41(1):50-54.GONG Z J,WANG Z F,WANG L X,et al.J Chin Ceram Soc,2013,41(1):50-54.
[13]ZHUANG H,YUE Z X,MENG S Q,et al.Low-temperature sintering and microwave dielectric properites of Ba3(VO4)2-Ba WO4 ceramic composites[J].J Am Ceram Soc,2010,91(11):3738-3741.
[14]MENG S,YUE Z,ZHUANG H,et al.Microwave dielectric properities of Ba3(VO4)2-Mg2SiO4 composite ceramics[J].J Am Ceram Soc,2010,93(2):359-361.
[15]高彬,杨青慧,张怀武.低温烧结Ba3(VO4)2-x ZnMoO4微波介质陶瓷研究[J].压电与声光,2014,36(3):455-457.GAO B,YANG Q H,ZHANG H W.Piezoelectr Acousto-optic,2014,36(3):455-457.
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