Microwave dielectric properties and low temperature sintering behavior of Li2CoTi3O8 ceramic

Microwave dielectric properties and low temperature sintering behavior of Li2CoTi3O8 ceramic
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Li2CoTi3O8陶瓷的微波介电性能及低温烧结行为

DOI:
10.1016/j.jallcom.2010.10.078
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发表时间:
2011-02
影响因子:
6.2
通讯作者:
Yang, Zhao
Yang, Zhao
中科院分区:
材料科学2区
文献类型:
--
作者:
Fang, Liang;Chu, Dongjin;Zhou, Huanfu;Chen, Xiuli;Yang, Zhao

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研究了含锂立方尖晶石Li 2CoTi 3 O 8的微波介电性能。混合氧化物法在900°C下可合成单相粉末,在1025°C空气中烧结可获得致密的陶瓷(约为理论密度的97%),显微结构均匀(6-15μm)。该陶瓷具有中等介电常数(ε r)(28.9)、高品质因数(Q×f)(52,600)和低谐振频率温度系数(τf)(7.4ppm/°C)。BaCu(B2 O 5)(BCB)的加入可以有效地将Li 2CoTi 3 O 8陶瓷的烧结温度从1025°C降低到900°C,并且不会导致微波介电性能的明显下降。BCB掺杂的Li 2CoTi 3 O 8陶瓷与Ag电极相容性良好,是一种很有应用前景的LTCC陶瓷。
The microwave dielectric properties of Li-containing cubic spinel Li2CoTi3O8have been investigated. Single-phase powders can be synthesized from the mixed-oxide route at 900°C and dense ceramics (∼97% of the theoretical density) with uniform microstructures (6–15μm) can be obtained by sintering in air at 1025°C. The ceramic exhibits a moderate permittivity (ɛr) of 28.9, a high quality factor value (Q×f) of 52,600, and a low temperature coefficient of the resonant frequency (τf) of 7.4ppm/°C. The addition of BaCu(B2O5) (BCB) can effectively lower the sintering temperature of Li2CoTi3O8ceramic from 1025°C to 900°C and does not induce much degradation of the microwave dielectric properties. The BCB doped Li2CoTi3O8ceramic can be compatible with Ag electrode, which makes it a promising ceramic for LTCC technology application.
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