Improving microwave dielectric properties of temperature - compensated Mg(1.04–1.5y)CeyTiO3 - based Ceramics with high quality factor. Issue 3 (15th February 2017)

• Record Type: Journal Article
• Authors: Gong, Wei; Ullah, Burhan; Lei, Wen; Fan, Gui-Fen; Wang, Xiao-Hong; Lu, Wen-Zhong
• Is Part Of: Ceramics international. Volume 43:Issue 3(2017)
• Page Start: 3051
• Page End: 3056
• Publication Date: 2017-02-15
• Subjects: Phase formation -- Chemical structure -- Microwave dielectric properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.11.111
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The phase formation, microstructure, chemical structure, and microwave (MW) dielectric properties of the composite ceramics (1- x )Mg(1.04–3/2 y ) Ce y TiO3 - x CaTiO3 (MCT-CT) have been investigated systematically. The CaTiO3 and MgTiO3 phases coexist well with the formation of secondary phase MgTi2 O5 based on X-ray diffraction. Chemical structure analysis reveals the existence of oxygen vacancies ( V O ) 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 (ε r ) 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 ε r ∼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.