The Crystallization, Microstructure, and Dielectric Characteristics of MgO–Al 2 O 3 –SiO 2 –TiO 2 –CeO 2 Materials for Microwave Applications

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2024-01, Vol.221 (2)
• Main Authors: Liao, Wanyou, Su, Tongqi, Tan, Haijun, Gong, Weiping, Luo, Xianfu, Ma, Yilong
• Format: Article
• Language: English
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202300595

In this article, the impacts of varying CeO 2 contents and heat‐treatment procedures on the crystallization, microstructure, and dielectric characteristics of MgO–Al 2 O 3 –SiO 2 –TiO 2 –CeO 2 (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 CeO 2 content promotes the formation of perrierite and inhibits the precipitation of α‐cordierite and rutile in the glass ceramics. An appropriate amount of CeO 2 content contributes to a dense microstructure and improves the dielectric characteristics of the samples. However, an excessive amount of CeO 2 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% CeO 2 , 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).