Effect of synthesized temperature on microstructure, infrared emissivity and dielectric property of Fe-doped ZnO powder

Fe-doped ZnO powder has been synthesized by coprecipitation method under different synthesized temperature, using zinc nitrate as the staring material, urea as the precipitator, and ferric nitrate as the doping source, respectively. The prepared powders have been characterized by XRD and SEM. Results show that when the synthesized temperature is below 700 C the prepared powders are ZnO(Fe) solid solution powders and the ZnFe₂O₄ impurity phase appeared for the Fe-doped ZnO powder synthesized at 700 C. The electric permittivities in the frequency range of 8.2-12.4 GHz and average infrared emissivity at the waveband range of 8-14 μm of prepared powders have been determined. The real part and imaginary part of electric permittivities of prepared powders have increased firstly and then decreased with increasing synthesized temperature. The average infrared emissivity has presented the opposite changing trend.