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首页> 外文期刊>Journal of materials science >Adjustable microwave dielectric properties of ZnO-TiO_2-ZrO_2-Nb_2O_5 composite ceramics via controlling the raw ZrO_2 content and sintering temperature
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Adjustable microwave dielectric properties of ZnO-TiO_2-ZrO_2-Nb_2O_5 composite ceramics via controlling the raw ZrO_2 content and sintering temperature

机译：通过控制原始ZrO_2的含量和烧结温度来调节ZnO-TiO_2-ZrO_2-Nb_2O_5复合陶瓷的微波介电性能

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摘要

A series of 2.5ZnO–(5− x )TiO~(2)– x ZrO~(2)–2.5Nb~(2)O~(5)(abbreviated as ZTZN, 0.2 ≤  x  ≤ 0.4) composite ceramics were prepared by a solid state reaction method. The phase composition and microwave dielectric properties of the ceramics were investigated. X-ray diffraction patterns displayed the coexistence of ZnTiNb~(2)O~(8)and Zn~(0.17)Nb~(0.33)Ti~(0.5)O~(2)phases. With increasing the sintering temperature, the bulk density ( ρ ), permittivity ( ε ~( r )) and temperature coefficient of resonator frequency ( τ ~( f )) increased. With increasing the ZrO~(2)content, the ρ firstly increased and then decreased, Q  ×  f value increased, ε ~( r )and τ ~( f )value decreased. Importantly, the τ ~( f )value of ZTZN ceramics (0.2 ≤  x  ≤ 0.4) could be adjusted to near-zero. The 2.5ZnO–4.7TiO~(2)–0.3ZrO~(2)–2.5Nb~(2)O~(5)ceramics sintered at 1075 °C exhibited the best comprehensive performances of Q  ×  f  = 30,155 GHz, ε ~( r ) = 44 and τ ~( f ) = 0.89 ppm/°C, indicating that they are candidates for microwave devices.
机译：制备了一系列2.5ZnO–（5−x）TiO〜（2）–x ZrO〜（2）–2.5Nb〜（2）O〜（5）（简称ZTZN，0.2≤x≤0.4）复合陶瓷通过固态反应方法。研究了陶瓷的相组成和微波介电性能。 X射线衍射图谱表明ZnTiNb〜（2）O〜（8）和Zn〜（0.17）Nb〜（0.33）Ti〜（0.5）O〜（2）相共存。随着烧结温度的升高，堆密度（ρ），介电常数（ε〜（r））和谐振器频率的温度系数（τ〜（f））增加。随着ZrO〜（2）含量的增加，ρ先增大后减小，Q Q×f值增大，ε〜（r）和τ〜（f）值减小。重要的是，可以将ZTZN陶瓷的τ〜（f）值（0.2≤x≤0.4）调整为接近零。在1075°C烧结的2.5ZnO–4.7TiO〜（2）–0.3ZrO〜（2）–2.5Nb〜（2）O〜（5）陶瓷表现出Q×f = 30,155 GHz，ε〜的最佳综合性能（r）= 44和τ〜（f）= 0.89 ppm /°C，表明它们是微波设备的候选者。

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