Low temperature sintering and microwave dielectric properties of CoTiNb2O8 ceramics with CuO addition
Low temperature sintering and microwave dielectric properties of CoTiNb2O8 ceramics with CuO addition
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添加CuO的CoTiNb2O8陶瓷的低温烧结及微波介电性能
DOI：
10.1016/j.ceramint.2015.10.162
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
Liu Hui
中科院分区：
文献类型：
--
作者：
Zhang Yun;Zhang Yingchun;Xiang Maoqiao;Liu Shuya;Liu Hui
采用常规固相反应法制备了低烧CuO掺杂cotinb2o8微波介质陶瓷，系统研究了CuO添加剂对其烧结性能、相组成、微观结构和微波介质性能的影响。在cotinb2o8中加入CuO成功地将烧结温度从1250℃降低到950℃。含CuO样品中，CuO与基体发生化学反应，形成液相cunb2o6；同时，通过XRD和EDS分析，对（Co, Cu） tinb2o8固溶体进行了检测。两者都促进了cotinb2o8陶瓷的致密化。CuO的加入没有引起微波性能的明显退化，但使τf值向零方向调整。当CuO含量为2 wt%时，950°C烧结的cotinb2o8陶瓷的最大相对密度为98.21%，具有最佳的微波介电性能，ε r0为61.45，highQ×fof为15,938 GHz， τ f0为42.12 ppm/°C，是LTCC应用的理想候选材料。
Low-fired CuO-doped CoTiNb2O8microwave dielectric ceramics were synthesized via a conventional solid-state reaction method and the effects of CuO additives on their sintering behavior, phase composition, microstructure and microwave dielectric properties were investigated systematically. The addition of CuO to CoTiNb2O8successfully lowered the sintering temperature from 1250 to 950 °C. Liquid phase CuNb2O6was formed due to the chemical reaction between CuO and matrix for the CuO-containing samples; meanwhile, (Co, Cu)TiNb2O8solid solution was detected by XRD and EDS analysis. Both of them promoted the densification of CoTiNb2O8ceramics. The addition of CuO did not induce apparent degradation in microwave properties but tailored theτfvalues toward zero direction. With 2 wt% CuO, CoTiNb2O8ceramics sintered at 950 °C reached the maximum relative density of 98.21% and possessed optimum microwave dielectric properties withεrof 61.45, a highQ×fof 15,938 GHz, and aτfof 42.12 ppm/°C, making them a promising candidate for LTCC applications.
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