Abstract
An original (1-x)ZnTiNb2O8-xZn0.17Nb0·33Ti0·5O2 (x = 0.35–0.75) composite ceramics were prepared by the traditional solid-state method. X-Ray diffraction and Raman spectroscopy results illustrated that only ZnTiNb2O8 and Zn0·17Nb0·33Ti0·5O2 were synthesized without any extra phase. The morphology and microstructures of the microwave dielectric ceramics were characterized by scanning electron microscopy and energy disperse spectroscopy. The addition of Zn0·17Nb0·33Ti0·5O2 not only effectively adjusted the τf of ZnTiNb2O8 matrix from −39.55 ppm/°C to 54.32 ppm/°C, but also significantly increased εr from −39.55 ppm/°C to 54.32 ppm/°C. But the Q × f values deteriorated from 36,914 GHz to 21,077 GHz as x increased. The ceramic with near-zero τf was synthesized at x = 0.55, meanwhile, 0.45ZnTiNb2O8-0.55Zn0·17Nb0·33Ti0·5O2 ceramic sintered at 1200 °C possessed attractive microwave dielectric properties: εr = 39.08 (6.2 GHz), Q × f = 31,384 GHz, and τf = −6.45 ppm/°C.
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