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Preparation and microwave dielectric properties of Bi2Ti4O11 ceramics

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Abstract

Single phase of Bi2Ti4O11 ceramics, which belong to meta-stable phase compounds, were synthesized by controlling the reaction time through conventional solid-state method. The effects of annealing time on phase composition of Bi2Ti4O11 ceramic powders and sintered ceramics were studied by XRD analysis. Second phase Bi2Ti2O7 appeared when the annealing time shorter than 4 h. However, pure phase of Bi2Ti4O11 powders can be formed by prolonging the annealing time to 6 h at 1,000 °C. The sintering temperatures on microstructure and microwave dielectric properties of Bi2Ti4O11 ceramics were investigated. The results show that ceramics sintered at 1,075–1,175 °C are single phase of Bi2Ti4O11 and present two different sizes of prismatic shape grains. Smaller size crystals grow into larger ones with increasing sintering temperature. The ceramics sintered at 1,125 °C reach a maximum density and have a microwave dielectric properties of εr = 51.2, Q × f = 3,050 GHz and τf = −297 ppm/°C.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51172019 and No. 10979013) and Beijing Natural Science Foundation (No. 2092020).

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Correspondence to Yingchun Zhang.

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Fu, B., Zhang, Y., Hong, M. et al. Preparation and microwave dielectric properties of Bi2Ti4O11 ceramics. J Mater Sci: Mater Electron 24, 3240–3243 (2013). https://doi.org/10.1007/s10854-013-1234-y

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  • DOI: https://doi.org/10.1007/s10854-013-1234-y

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