The Crystallization, Microstructure, and Dielectric Characteristics of MgO–Al2O3–SiO2–TiO2–CeO2 Materials for Microwave Applications

Abstract

In this article, the impacts of varying CeO2 contents and heat‐treatment procedures on the crystallization, microstructure, and dielectric characteristics of MgO–Al2O3–SiO2–TiO2–CeO2 (MASTC) materials are investigated. In this research, it is indicated that perrierite, rutile, and α‐cordierite are the major crystalline phases in the materials. An increased CeO2 content promotes the formation of perrierite and inhibits the precipitation of α‐cordierite and rutile in the glass ceramics. An appropriate amount of CeO2 content contributes to a dense microstructure and improves the dielectric characteristics of the samples. However, an excessive amount of CeO2 deteriorates the densification and dielectric characteristics of the MASTC materials. Furthermore, heat‐treatment temperature and duration also have a significant impact on the crystallization, microstructure, and dielectric performance of the materials. The MASTC material with 20.2 wt% CeO2, heat‐treated at 1100 °C for a duration of 3 h, possesses superior characteristics with a density of 3.14 g cm−3, a permittivity of 11.1, and a Q × f factor of 17 357 (14 GHz).