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Enhanced dielectric and microwave absorption properties of Y2Ti2O7 ceramics by Sr doping

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Abstract

Sr-doped Y2Ti2O7 has been synthesized by hot-pressing sintering in the vacuum with graphite die. The thermogravimetric analysis, electrical conductivity, dielectric and microwave absorption properties of Y2-xSrxTi2O7-δ (x = 0.05, 0.1, 0.15, 0.2) investigated. The ε′ of Y1.8Sr0.2Ti2O7-δ is four times larger than the pure Y2Ti2O7 and twice larger than that of Y1.8Ca0.2Ti2O7-δ at 8.2 GHz. The ε’’ of Y2-xSrxTi2O7-δ is also enhanced significantly. The reflection loss of Y0.85Sr0.15Ti2O7-δ with a thickness of 0.85 mm reaches a maximum absorbing peak of − 29.68 dB and bandwidth (reflection loss ≤ − 5 dB) of 2.9 GHz. These findings pave the way for the development of high dielectric constant materials operating in the 8.2–12.4 GHz region with potential applications in thin and efficient microwave absorber.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51701148, No. 51602260), and the State Key Laboratory of Solidification Processing (NWPU), China (Grant Nos. KP201422 and KP201604).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Qinlong Wen, Wancheng Zhou, Hui Gao, Yingying Zhou, Fa Luo, Dongmei Zhu, Zhibin Huang & Yuchang Qing

  2. School of Material Engineering, Xi’an Aeronautical University, Xi’an, Shaanxi, 710077, China

    Yingying Zhou

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  1. Qinlong Wen
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Wen, Q., Zhou, W., Gao, H. et al. Enhanced dielectric and microwave absorption properties of Y2Ti2O7 ceramics by Sr doping. Appl. Phys. A 125, 413 (2019). https://doi.org/10.1007/s00339-019-2702-x

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