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Investigation on phase composition and microwave dielectric properties of MgO-SiO2-TiO2 system

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Abstract

The microwave dielectric properties of MgO-SiO2-TiO2 system were investigated through the solid sintering method. A detailed analysis was conducted to investigate the effects of SiO2 content and holding time on the phase composition, microstructure, sintering characteristics and dielectric properties of MgO-SiO2-TiO2 ceramics. In this study, it was discovered that for all compositions, a three-phase composite of Mg2SiO4, Mg2TiO4 and MgO was observed. Furthermore, as the SiO2 content increased, there was a gradual increase in the amount of Mg2SiO4 phase, while the amounts of Mg2TiO4 and MgO phases decreased. Although holding time did not change the phase type, it influenced the intensity of diffraction peaks of each phase. The variation of holding time affected reaction efficiency and crystallization behavior of the samples. The MgO-SiO2-TiO2 system exhibited wide tunability in terms of dielectric constants, and higher quality factors were observed at lower dielectric constant values. The MgO-SiO2-TiO2 system, composed of 50.44 wt% MgO, 30.28 wt% SiO2 and 14.28 wt% TiO2, were sintered at 1500 ℃ for 2 h. Remarkable dielectric properties were achieved, with the dielectric constant measured at 7.7, the quality factor recorded as 89,798 GHz (11 GHz), and the temperature coefficient of the resonant frequency calculated as − 32.5 ppm/℃.

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Funding

This study was funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites; the National Natural Science Foundation of China (Grant No. 52102089); and the Key Research and Development Program of Zhejiang Province (Grant No. 2020C0112; 2021C01092).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China

    Yiting Shan, Yang Lu & Hongqing Zhou

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing, 211816, China

    Yiting Shan, Yang Lu & Hongqing Zhou

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  1. Yiting Shan
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Yiting Shan contributed to the conception of this study, performed the experiment, analyzed the data and wrote the manuscript. Yang Lu helped perform the analysis with constructive discussions.

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Correspondence to Hongqing Zhou.

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Shan, Y., Lu, Y. & Zhou, H. Investigation on phase composition and microwave dielectric properties of MgO-SiO2-TiO2 system. J Mater Sci: Mater Electron 35, 979 (2024). https://doi.org/10.1007/s10854-024-12722-1

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