Microwave dielectric properties of 5Li2O-(Nb1−xMx)2O5-5TiO2 (M=Mo, W, 0
Ying Wu, Zhifu Liu, Yongxiang Li

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Abstract

5Li2O-(Nb1-xMx)2O5-5TiO2 (M=Mo, W, 0<;x<;0.2) ceramics were prepared via solid state method. The phase composition and microwave dielectric properties were studied. There is no Mo-related phase observed even 20 mol% Mo is doped. However, the Li2WO4 is clearly detected from XRD results for 5Li2O-(Nb1-xWx)2O5-5TiO2 (x>0.05). Both Mo and W can lower the sintering temperature. The doped ceramics can be sintered at 1000°C which is 100°C lower than the sintering temperature of pure 5Li2O-(Nb1-xMx)2O5-5TiO2 ceramic. The relative permittivity and Q×f value decrease gradually with increasing doping. And best microwave dielectric properties with a relative permittivity of 29 and a quality factor (Q×f) ~7,000 GHz (at 6.5 GHz) is achieved when 5Li2O-(Nb0.95Mo0.05)2O5-5TiO2 is sintered at 1000°C/2h.
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5Li2O-(Nb1−xMx)2O5-5TiO2 (M=Mo, W, 0
5Li2O-(Nb1-xWx)2O5-5TiO2 (x>0.05)的x射线衍射(XRD)结果表明,5Li2O-(Nb1-xMx)2O5-5TiO2 (M=Mo, W, 02WO4)具有良好的检测效果。Mo和W均能降低烧结温度。掺杂陶瓷可以在1000℃下烧结,比纯5Li2O-(Nb1-xMx)2O5-5TiO2陶瓷的烧结温度低100℃。随着掺杂量的增加,相对介电常数和Q×f值逐渐减小。5Li2O-(Nb0.95Mo0.05)2O5-5TiO2在1000℃/2h下烧结时的微波介电性能最佳,相对介电常数为29,质量因子(Q×f) ~ 7000 GHz (6.5 GHz)。
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