Publication Date:
2016-07-05
Description:
Low-fired cobalt niobate (CoNb 2 O 6 ) microwave dielectric ceramics were prepared through a developed sol–gel process using Nb 2 O 5 · n H 2 O as starting source. A metal-dioxo-bridged complex precursor was described on the basis of FT-IR spectrum. The crystalline phases of calcined powders were characterized by X-ray diffraction. Nanosized CoNb 2 O 6 particles with orthorhombic α-PbO 2 -type structure were obtained above 750°C. There was no subsequent phase change upon sintering, and all compounds sintered to at least 94% of theoretical density. At 1000°C/4 h, CoNb 2 O 6 ceramics exhibited ε r ~ 21.9, Q × f ~ 66 140 GHz (at 8.9 GHz) and τ f ~ −39.7 ppm/°C, having a good potential for low-temperature cofired ceramic applications.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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