Study on the Properties of (Mg0.9Zn0.1)TiO3–(Ca0.61La0.26)TiO3 Ceramics by Microwave Sintering

With the rapid development of the information age, the study of microwave dielectric ceramics has become a research trend in recent years. Microwave dielectric ceramics are usually prepared by conventional sintering. However, slower heating speed and longer sintering time will not only lead to resource loss, but also lead to abnormal grain growth. Microwave Sintering has the advantages of shortening sintering time and improving the microstructure of materials. Therefore, microwave sintering is the research hotspot of the sintering method. In this paper, (1 − x)(Mg0.9Zn0.1)TiO3–x(Ca0.61La0.26)TiO3 (x = 0.15, referred to as 85M9Z1CLT) system ceramics were prepared by different methods. The results showed that microwave sintering shortened the sintering time of 85M9Z1CLT ceramics and reduced the formation of impurity phase (Mg0.9Zn0.1)Ti2O5. In addition, the grains of 85M9Z1CLT ceramics prepared by microwave sintering were more uniform and fine, and had less Zn evaporation. Therefore, the ceramic quality factor was increased by 21% compared with the conventional sintering. As a result, excellent dielectric properties of 25.63 for εr, 116,000 GHz for Qf and +1 ppm/°C for τf were obtained by microwave sintering at 1325 °C for 20 min. The microwave sintering method used in this paper can provide ideas for energy saving and environmental protection.