Authors: HaiTao Wu JinXin Bi
Publish Date: 2015/12/16
Volume: 27, Issue: 4, Pages: 3474-3480
Abstract
Microwave dielectric ceramics based on monoclinicstructure ZnZrNb2O8 were prepared by an aqueous sol–gel process Highly reactive nanosized ZnZrNb2O8 powders with particle sizes of 10–30 nm were successfully obtained at 600 °C as precursors And the evolution of phase formation was investigated by means of DTA–TG and XRD analysis Both selected area electronic diffraction patterns and highresolution crystal lattice image were characterized for the evaluation of crystallinity by mean of transmission electron microscopy Sintering characteristics and microwave dielectric properties of ZnZrNb2O8 ceramics were studied depending on sintering temperatures ranging from 1100 to 1250 °C The dielectric properties were strongly dependent on the compositions the densifications and the microstructures of the specimens With the increase of sintering temperature density εr and Q·f values increased and saturated at 1200 °C with excellent microwave properties ɛ r of 2738 Q·f value of 66700 GHz and τ f value of −384 ppm/°C The correlations of microstructure and dielectric properties for ZnZrNb2O8 ceramics were also investigatedThis work was supported by the project development plan of science and technology of Jinan City No 201303061 Jinan City Youth Science and Technology Star Project No 2013035 and National Natural Science Foundation No 51472108 and Study Abroad Programs by Shandong Province Government
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