Microwave Dielectric Properties of Zn0.95Mg0.05TiO3 + 0.25TiO2 Ceramics with 3ZnO–B2O3 Addition
Microwave Dielectric Properties of Zn0.95Mg0.05TiO3 + 0.25TiO2 Ceramics with 3ZnO–B2O3 Addition
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DOI：
10.1143/jjap.43.7596
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发表时间：
2004-11
影响因子：
1.5
通讯作者：
Ying-Chieh Lee;Wen-Hsi Lee;F. Shiao
中科院分区：
文献类型：
--
作者：
Ying-Chieh Lee;Wen-Hsi Lee;F. Shiao
在介电材料中加入氧化硼和氧化锌（ZnBO）可以降低材料的燃烧温度，近年来受到广泛关注。在860 ~ 940℃的烧结温度下，研究了ZnBO添加量为2 wt%对Zn0.95Mg0.05TiO3 + 0.25TiO2 （ZMT’）陶瓷显微结构和微波介电性能的影响。结果表明，添加少量ZnBO （1 wt%）可显著提高ZMT陶瓷的密度，改善其微波介电性能。在900℃下，掺杂ZMT陶瓷的烧结密度可达到理论密度的95%以上。ZMT陶瓷中存在金红石第二相，并随着ZnBO添加量的增加和烧结温度的升高而增加。烧结温度为920℃时，观察到Zn2TiO4尖晶石相。ZMT'陶瓷在900°C下烧结2 h时的介电性能为εr=23.6, Q×f=30990 (7.75 GHz), τf=-8 ppm/°C。
Boron oxide and zinc oxide (ZnBO) added to dielectric materials have attracted great attention recently because they enable the lowering of the firing temperature. The effects of ZnBO addition up to 2 wt% on the microstructure and microwave dielectric properties of zinc magnesium titanate Zn0.95Mg0.05TiO3 + 0.25TiO2 (ZMT') ceramics were investigated for sintering temperatures ranging from 860° to 940°C. It was found that small amount of added ZnBO (1 wt%) can significantly increase the density and improve the microwave dielectric properties of ZMT' ceramics. Doped ZMT' ceramics can be sintered to a density higher than 95% of the theoretical density at 900°C. A rutile second phase exists in the ZMT' ceramics, and it increases with increasing amount of added ZnBO and sintering temperature. In addition, the Zn2TiO4 spinel phase was observed with a sintering temperature of 920°C. The measured dielectric properties of ZMT' ceramics with 1 wt% ZnBO addition sintered at 900°C for 2 h were εr=23.6, Q×f=30990 (at 7.75 GHz) and τf=-8 ppm/°C.