Synthesis and dielectric properties of a new Mg2CeNbO6.5 ceramic system at microwave frequencies
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New microwave dielectric ceramics Mg2CeNbO6.5 were synthesized by solid-state method. The phase, crystal structure, micro-structures and microwave dielectric properties of Mg2CeNbO6.5 ceramics had been investigated in the sintering temperature range of 1225–1325 °C. Two phases were detected by the X-ray diffraction patterns, including the main crystalline phase of CeO2 and the second phase of Mg4Nb2O9. Well-developed microstructures of the well-dense samples were obtained for samples sintered at 1225–1325 °C. As sintering temperature increased, the τ f values were stable, however, the significant change in the ɛr values and Q × f values were observed. At 1275 °C, the obtained Mg2CeNbO6.5 ceramics had promising excellent microwave dielectric properties: εr = 15.38, Q × f = 17,300 GHz and τ f = − 49.71 ppm/°C.
This work is supported by the Fundamental Research Funds for the Central Universities of China under Grant No. 2015XKQY13 and sponsored by Qing Lan Project.
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