Influence of glass additives on the microwave dielectric properties of Ca 5Nb 2TiO 12 ceramics

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 123; no. 1; pp. 31 - 40
• Main Authors: Bijumon, P.V., Sebastian, M.T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2005
• Subjects: Ca 5Nb 2TiO 12 ceramics; Complex perovskites; Dielectric resonators; Glass addition; Microwave ceramics; Glass addition; Complex perovskites; Dielectric resonators; Ca 5Nb 2TiO 12 ceramics; Microwave ceramics
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2005.06.011

Investigation was made to correlate the effect of composition and concentration of glass content on the sintering temperature and microwave dielectric properties of polycrystalline Ca 5Nb 2TiO 12 ceramics. Glass systems, such as B 2O 3, SiO 2, B 2O 3–SiO 2, ZnO–B 2O 3, Al 2O 3–SiO 2, Al 2O 3–B 2O 3–SiO 2, BaO–B 2O 3–SiO 2, MgO–B 2O 3–SiO 2, ZnO–B 2O 3–SiO 2, PbO–B 2O 3–SiO 2, and 2MgO–Al 2O 3–5SiO 2 were added to calcined Ca 5Nb 2TiO 12 powder in different weight percentages. The structure and microstructure of the sintered ceramics were studied using powder X-ray diffraction and scanning electron microscopic methods. The specimens were characterized in the microwave frequency range (3–6 GHz). The study revealed that alumina and silica based glasses were more effective in improving the dielectric properties of Ca 5Nb 2TiO 12 ceramics, whereas borate glasses are more suited for lowering the sintering temperature.