Abstract
For the purpose of sintering 0.67ZrTi2O6–0.33ZnNb2O6 ceramics in air, y(y=0.0–2.0) wt% MnCO3 was doped into it by solid-state reaction. XRD analysis suggested there were two phases: the solid solution ZrTi2O6 and the rutile TiO2. SEM analysis demonstrated MnCO3 could promote the grain growth obviously. The addition of MnCO3 had a great positive influence on the Q×f values, for example the sample with 0.7wt% MnCO3 had the highest Q×f value=44,800GHz, which was fifteen times higher than that of the undoped sample, because Mn ions worked as acceptors to receive the unwanted electrons left by the lost oxygen. The dielectric ceramics with the composition 0.67ZrTi2O6–0.33ZnNb2O6+0.7wt% MnCO3 were sintered well at 1270°C in air and it showed good microwave dielectric properties: εr=44.4, Q×f=44,800GHz and τf=−6.8ppm/°C. Therefore, this method has the advantage over sintering ZrTi2O6–ZnNb2O6 ceramics in oxygen.
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