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Published in:
21-09-2017
Microwave dielectric properties of 0.6ZrO2–0.4(Zn1/3Nb2/3)O2–TiO2 ceramics doped with Li2CO3, CuO or MnCO3
Published in: Journal of Materials Science: Materials in Electronics | Issue 1/2018
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Abstract
0.6ZrO2–0.4(Zn1/3Nb2/3)O2–TiO2(ZN40) microwave dielectric ceramics were prepared by conventional solid-state reaction method, and the effects of Li2CO3, CuO, MnCO3 additives doping on their microstructures, phase composition, and dielectric properties were investigated. The results shown that suitable additives didn’t change the crystal phase of ZN40 ceramics, and the main crystalline phase of all the samples was orthorhombic α-PbO2 type ZrTiO4; a moderate amount of Li2CO3, CuO, MnCO3 could not only effectively lower the sintering temperature due to form liquid-phase, or promote ion diffusion by Ti-site ionic substitution of unequal values, but also improve the quality factor (Q × f). The optimal integrated microwave dielectric properties(ε
r
= 42.59, Q × f = 52,500 GHz and τ
f
= +7.8 ppm/°C) were achieved for ZN40 ceramics containing 1 wt% MnCO3 sintered at 1220 °C for 3 h, and which make this material a prospective candidate for use in satellite communication and mobile communication base station.