Broad sintering temperature range and stable microwave dielectric properties of Mg2TiO4-CeO2 composite ceramics

作者：Wang, Xi; Zhou, Shicheng; Liu, Kaiyang; Deng, Shan; Xiao, Yaqi; Chen, Xiuli; Zhou, Huanfu^*

来源：Ceramics International, 2022, 48(14): 20245-20250.

DOI：10.1016/j.ceramint.2022.03.304

• Ceramics
• Sintering
• Sintering temperature
• Dielectric materials
• Microwave dielectric materials
• Solid-phase reaction

There has been extensive research on microwave dielectric materials considering their application in 5G and 6G communication technologies. In this study, the sintering temperature range of Mg2TiO4-CeO2 (MT-C) ceramics was broadened using a composite of CeO2 and Mg2TiO4 ceramics, and their microwave dielectric performance was stabilized. Low-loss MT-C composite ceramics were prepared using the solid-phase reaction method, and their microwave dielectric properties, microscopic morphologies, and phase structures were investigated. The proposed MT-C ceramics contained Mg2TiO4 and CeO2 phases; their average grain size was maintained at 2-4 mu m in the sintering temperature range of 1275-1425 degrees C, and the samples were uniformly dense without porosity. The cross-distribution of Mg2TiO4 and CeO2 grains in the samples inhibited the growth of ceramic grains, providing uniform and dense surfaces. The dielectric loss of MT-C ceramics remained constant in the temperature range of 1300-1425 degrees C at 9 x 10(-4) (8.45 <= f <= 8.75 GHz). As opposed to the base material, MT-C ceramics are advantageous owing to their wide sintering temperature range and the stable microwave dielectric properties, and there are suitable substrate materials for further industrial applications.

• 单位
  桂林理工大学