Abstract
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 °C. The microwave dielectric properties of ceramics were sensitive to processing condition and crystal structure. For the CoTiNb2O8 compounds, the variations of εr and Q × f value agreed well with that of the relative density. The τf was explained in terms of oxygen octahedral distortion and B-site bond valence. At 1000°C/4h, CoTiNb2O8 ceramic possessed optimal microwave dielectric properties with an εr of 64.19, a high Q × f of 16,800 GHz (at 6.4 GHz) and a τf of 66.17 ppm/°C.
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