Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics |
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Authors: | Lingxia LiXiang Ding Qingwei Liao |
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Affiliation: | School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China |
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Abstract: | Microwave dielectric properties and microstructures of (Mg0.95Co0.05)TiO3 ceramics prepared by a new sintering method (reaction-sintering method) were investigated. A pure phase of (Mg0.95Co0.05)TiO3 was obtained by the new method and excellent dielectric properties were observed due to uniformities of the microstructure and the phase. In contrast, the secondary phase (Mg0.95Co0.05)Ti2O5 was observed in samples prepared by conventional sintering method. In order to study the influence of secondary phase on the microwave dielectric properties quantitatively, the weight fraction of (Mg0.95Co0.05)Ti2O5 was calculated on the basis of Rietveld refinement. The pore-free?r values of specimens prepared by two different methods indicated that porosity plays an important role in the ?r values of (Mg0.95Co0.05)TiO3 ceramics. Specimens sintered by reaction-sintering method at 1350 °C for 4 h possess excellent dielectric properties with an ?r of 16.3, a Q × f value of 244,500 GHz, and a τf value of −53.5 ppm/°C. |
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Keywords: | (Mg0 95Co0 05)TiO3 High Q Reaction-sintering Rietveld refinement Lichtenecker's mixture formula Pore-free ?r |
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