Ca3MgSi2O8: Novel low-permittivity microwave dielectric ceramics for 5G application

In this research, the novel low permittivity Ca3MgSi2O8 microwave dielectric ceramics have been fabricated via conventional solid state process and their synthesis, sintering and microwave dielectric properties were investigated. The thermal behavior of the ball milled stoichiometric mixtures was investigated using simultaneous thermal analysis. Scanning electron microscopy image and particle size distribution of synthesized powder showed that the particle size fell into a range of similar to 1-11 mu m. X-ray diffraction analysis of synthesized and sintered ceramics showed that single phase Ca3MgSi2O8 crystallized in a monoclinic structure. Relative density near 99% of theoretical density, epsilon(r) = 13.8, quality factor (Q x f) similar to 27000 GHz (at 10.8 GHz) and tau(f) = -62 were obtained for ceramics sintered at 1375 degrees C. Hence, it is to be hoped that Ca3MgSi2O8 ceramics can be selected as a possible candidate for 5G application and their performance can be improved by optimization of synthesis and sintering process. (C) 2019 Elsevier B.V. All rights reserved.