Improving microwave dielectric properties of temperature - compensated Mg_(1.04-1.5y)Ce_yTiO₃ - based Ceramics with high quality factor

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• 作者：Wei Gong^a ; ^b ; Burhan Ullah^a ; ^b ; Wen Lei^a ; ^b ; Gui-Fen Fan^a ; ^b ; Xiao-Hong Wang^a ; ^b ; Wen-Zhong Lu^a ; ^b ; ^{lwz@mail.hust.edu.cn}
• 关键词：Phase formation ; Chemical structure ; Microwave dielectric properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：3051-3056
• 全文大小：1207 K
• 卷排序：43

文摘

The phase formation, microstructure, chemical structure, and microwave (MW) dielectric properties of the composite ceramics (1-x)Mg(1.04–3/2y)CeyTiO3-xCaTiO3 (MCT-CT) have been investigated systematically. The CaTiO3 and MgTiO3 phases coexist well with the formation of secondary phase MgTi2O5 based on X-ray diffraction. Chemical structure analysis reveals the existence of oxygen vacancies (VO ) whose concentrations increase with x, which consequently induce microwave dielectric loss. It has demonstrated that the behaviors of Q×f are influenced strongly by the phase composition and vacancy defects. Although an increasing amount of CaTiO3 can improve the dielectric constant (εr) of the sample slightly, it renders a decrease in the Q×f value instead. The τf value is strongly correlated to the compositions and the existing phases that can be controlled. An excellent combination of the MW dielectric properties εr∼23, Q×f∼70, 800 GHz, and τf∼0 ppm/°C was obtained at x=0.08, sintered at an optimal temperature of 1300 °C/3 h.