Microwave dielectric properties of sol-gel derived CoTiNb2O8 ceramics

作者：Zhang, Yun; Zhang, Yingchun^*

来源：Journal of Alloys and Compounds, 2016, 683: 86-91.

DOI：10.1016/j.jallcom.2016.05.081

• Microwave dielectric properties
• CoTiNb2O8 ceramic
• Sol-gel synthesis

CoTiNb2O8 microwave dielectric ceramics were synthesized via a modified sol-gel route. The thermal decomposition behavior of the as-prepared precursor was characterized by differential thermal analysis (DTA)/thermogravimetry (TG). Highly reactive CoTiNb2O8 nano-powders with average particle size of 34 nm were achieved by the reaction between TiO2 and intermediate phase CoNb2O6 at 800 degrees C. The microwave dielectric properties of ceramics were sensitive to processing condition and crystal structure. For the CoTiNb2O8 compounds, the variations of epsilon(r) and Q x f value agreed well with that of the relative density. The tau(f) was explained in terms of oxygen octahedral distortion and B-site bond valence. At 1000 degrees C/4h, CoTiNb2O8 ceramic possessed optimal microwave dielectric properties with an epsilon(r) of 64.19, a high Q x f of 16,800 GHz (at 6.4 GHz) and a tau(f) of 66.17 ppm/degrees C.

• 出版日期2016-10-25
• 单位北京科技大学