硅酸盐学报

MnCO3掺杂对BMN陶瓷结构及介电性能的影响

作者：彭森1 2 3 吴孟强3 黄同成1 2 许建明1 2 罗高峰1 2 周建华1 2 余建坤1 2 张树人3

单位：1. 邵阳学院信息工程系湖南邵阳 422000 2. 邵阳学院湘西南农村信息化服务湖南省重点实验室湖南邵阳 422000 3. 电子科技大学能源科学与工程学院成都 611731

关键词：掺杂微波介质陶瓷铌镁酸钡介电性能

分类号：TM277

出版年,卷(期):页码：2017,45(3):339-345

DOI：10.14062/j.issn.0454-5648.2017.03.03

摘要：

采用固相烧结法，探讨了 MnCO3掺杂降低 Ba(Mg1/3Nb2/3)O3 (BMN)烧结温度的机理，研究了 MnCO3掺杂量对 BMN 陶瓷微波介电性能的影响。结果表明，适量的 MnCO3掺杂可以促进烧结，有效降低 BMN 陶瓷的烧结温度，改善陶瓷的微波介电性能。当 MnCO3掺杂量为 4%(质量分数)时，BMN 陶瓷的烧结温度从纯相烧结时的 1 550 ℃降低到 1 250 ℃，表观密度 ρ = 6.36 g/cm3，相对理论密度达到 98.6%，并具有良好的微波介电特性：高相对介电常数 εr = 31.4，高品质因数与谐振频率的乘积 Q·f =99 200 GHz (8 GHz)，接近于零的谐振频率温度系数 τf = 3×10–7/℃。

MnCO3-doped Ba(Mg1/3Nb2/3)O3 (BMN) microwave dielectric ceramics were prepared via a solid-phase reaction sintering process. The effect of MnCO3-doped amount on the sintering temperature, microstructures and dielectric properties of BMN ceramics was investigated. The results indicate that MnCO3 addition can lower the sintering temperature of the ceramics and improve the microwave dielectric properties. When MnCO3 is 4%, the sintering temperature decreases from 1 550 to 1 250 ℃. The apparent density of MnCO3-doped BMN microwave dielectric ceramic is 6.36 g/cm3, the relative theoretical density is 98.6%. This ceramic possesses the superior microwave dielectric properties (i.e., high relative dielectric constant of 31.4, high quality factor plus resonant frequency of 99 200 GHz (8 GHz), and near-zero temperature coefficient of resonant frequency value of 3×10–7/℃.

基金项目：

国家自然科学基金(61135004)；湖南省自然科学基金(14JJ7075， 15JJ2130)；湖南省教育厅基金(13A091，14A129，07C681)；湖南省高校科技创新团队支持计划资助。

作者简介：

彭森(1983—)，男，硕士，讲师。

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