Preparation And Study Of Microwave Low Dielectric Ceramic Celsian

By using kaolin to replace Al₂O₃ and SiO₂,we produced strontium feldspar ceramic.Orthogonal experiments were carried out at different temperatures with two factors of Al₂O₃ and SiO₂.Then,we carried out a comprehensive analysis by using microwave vector network analyzer and XRD.The results prove that:Using kaolin replacing Al₂O₃ and SiO₂,the sintering temperature of celsian could reduce about 200 ?.In the sintering temperature range,with the increase of sintering temperature,the Q value was increased,the reason is that when the temperature is low,the reaction is not complete.The best sintering temperature is 1360?.The monoclinic phase of strontium feldspar in the microwave band has a dielectric constant of less than 2.9 and a Q value of higher than 1000,and it reached a practical index.In our experiment,when the molar ratio of Al₂O₃ to SiO₂ is 0.5,the content of SrCO₃ is 1mol,and the content of Al₂O₃ is 1.08 mol,we obtained the dielectric constant reached 2.86 and the Q value reached 1071 tested on frequency of 18.005 GHz,there is no similar report in the field of low-k microwave dielectric ceramic so far.The prepared strontium feldspar ceramic is a promising low-k microwave dielectric material.The doping of B₂O₃,Y₂O₃ and ZrO₂ had an effect on the dielectric properties of strontium feldspar.B³⁺ ions and Zr⁴⁺ ions are easier to enter the lattice,while Y³⁺ ions is more concentrated on the grain boundary,and the ions enriched on the grain boundary can obviously reduce the Q value of the material.The doping of B₂O₃ is the best.When the content of B₂O₃ is 0.035 mol,the dielectric constant of the sample is 2.85,and the Q value is about 1195.