Influences of CuO addition on sintering, microstructural characteristics and microwave dielectric properties of 0.6Nd[(Zn0.7Co0.3)0.5Ti0.5]O3–0.4(Na0.5Nd0.5)TiO3 ceramics
Influences of CuO addition on sintering, microstructural characteristics and microwave dielectric properties of 0.6Nd[(Zn0.7Co0.3)0.5Ti0.5]O3–0.4(Na0.5Nd0.5)TiO3 ceramics
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DOI：
10.1016/j.ceramint.2017.08.147
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发表时间：
2017-12
影响因子：
5.2
通讯作者：
Jiamao Li;Zhenhua Tian;L. Yao;S. Ran;C. Fan
中科院分区：
文献类型：
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作者：
Jiamao Li;Zhenhua Tian;L. Yao;S. Ran;C. Fan
采用传统陶瓷工艺制备了不同CuO含量的0.6Nd[（Zn0.7Co0.3）0.5Ti0.5]O3-0.4（Na0.5Nd0.5）TiO 3（NZCT-NNT）陶瓷。研究了CuO的添加对NZCT-NNT陶瓷的烧结、显微结构和微波介电性能的影响。作为烧结助剂，CuO的加入改善了烧结性能，并促进了致密化的NZCT-NNT陶瓷由于液相的产生。NZCT-NNT陶瓷的烧结温度成功地从1410 °C降低到1250 °C。CuO的添加导致NZCT-NNT陶瓷的晶粒形状发生变化，从板状层状形状到圆形形状。此外，CuO的加入使NZCT-NNT陶瓷的谐振频率温度系数（τf）趋于零，而介电常数（εr）和品质因数（Q×f）没有明显降低。在1250 °C烧结3 h后，添加2.0wt%CuO的NZCT-NNT陶瓷具有最佳的微波介电性能：εr= 48.56，Q ×f= 46, 420 GHz，τf= +1.3ppm/°C。CuO掺杂的NZCT-NNT陶瓷在要求低烧结温度的微波器件中具有潜在的商业应用价值。
0.6Nd[(Zn0.7Co0.3)0.5Ti0.5]O3–0.4(Na0.5Nd0.5)TiO3(NZCT–NNT) ceramics with different amounts of CuO were prepared through a traditional ceramic technique. The influences of CuO addition on the sintering, microstructural characteristics and microwave dielectric properties of the NZCT–NNT ceramics were studied in detail. Acting as a sintering aid, CuO addition improved the sinterability and promoted the densification of the NZCT–NNT ceramics due to the production of a liquid phase. The sintering temperature of the NZCT–NNT ceramics was successfully reduced from 1410 °C to 1250 °C. The addition of CuO resulted in a change in the grain shape of the NZCT–NNT ceramics, ranging from a plate-like layered shape to a round–like shape. Additionally, CuO addition adjusted the temperature coefficient of resonant frequency (τf) toward near–zero without inducing an obvious deterioration in the dielectric constant (εr) and the quality factor (Q×f) of the NZCT–NNT ceramics. After being sintered at 1250 °C for 3 h, the NZCT–NNT ceramics to which 2.0 wt% CuO was added exhibited optimized microwave dielectric properties of εr= 48.56,Q×f= 46,420 GHz, and τf= + 1.3 ppm/°C. The CuO–doped NZCT–NNT ceramics could find the potential commercial applications in microwave components that require low sintering temperatures.