This article reports on microstructure and dielectric properties of Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics. Dielectric peaks of the Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics were markedly suppressed, broadened, and shifted to low temperature with increasing content of W. The limit of W incorporating into the barium strontium titanate (BST) lattice was y = 0.02. Two second phases (BaWO4 and Ba2Ti5O12) were formed above the solid solution limit of W in BST. The doping mechanism represents a new approach to develop microwave tunable materials. Dielectric properties of the Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics could be optimized by the content of W. The sample with y = 0.05 had ε′ of 431, quality factor of 365 (at 2.111 GHz), and tunability of 11.5%, which makes a potential candidate for tunable microwave device applications in the wireless communication.
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This research was supported by the Ministry of Sciences and Technology of China through 973-project under grant 2009CB623302, the Cultivation Fund of the Key Scientific and Technical Innovation Project.
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Zhang, M., Zhai, J., Shen, B. et al. Microwave dielectric properties of low loss and highly tunable Ba0.5Sr0.5Ti1−3y/2WyO3 ceramics. Journal of Materials Research 27, 910–914 (2012). https://doi.org/10.1557/jmr.2011.429