| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5438981 | Ceramics International | 2017 | 6 Pages |
Abstract
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 QÃf 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 QÃf value instead. The Ïf value is strongly correlated to the compositions and the existing phases that can be controlled. An excellent combination of the MW dielectric properties εrâ¼23, QÃfâ¼70, 800 GHz, and Ïfâ¼0 ppm/°C was obtained at x=0.08, sintered at an optimal temperature of 1300 °C/3 h.
-
- ) whose concentrations increase with x, which consequently induce microwave dielectric loss. It has demonstrated that the behaviors of QÃf 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 QÃf value instead. The Ïf value is strongly correlated to the compositions and the existing phases that can be controlled. An excellent combination of the MW dielectric properties εrâ¼23, QÃfâ¼70, 800 GHz, and Ïfâ¼0 ppm/°C was obtained at x=0.08, sintered at an optimal temperature of 1300 °C/3 h.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Wei Gong, Burhan Ullah, Wen Lei, Gui-Fen Fan, Xiao-Hong Wang, Wen-Zhong Lu,