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Microwave dielectric properties of Ba3.75Nd9.5Ti18−zCr4z/3O54 ceramics

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Abstract

The Ba3.75Nd9.5Ti18−z Cr4z/3O54 (0 ≤ z ≤ 3.0) ceramics were prepared using the solid-state reaction route. The influence of substitution of Cr for Ti on microstructure and microwave dielectric properties of Ba3.75Nd9.5Ti18−z Cr4z/3O54 (BNTCz) ceramics was investigated in this study. The X-ray diffraction patterns (XRD) of the specimens showed that pure BaNd2Ti5O14 phase with tungsten bronze structure existed for z ≤ 1, but the secondary phase Ba4Ti12O27 was observed for 1.5 ≤ z ≤ 3. The substitution of Cr for Ti was confirmed by the results of scanning electron microscopy and energy dispersive spectrometer. The dielectric constant (ε r ) was deteriorated with the increment of substitution which was in accord with the tendency of apparent density. The quality factor value (Q×f) was improved by a small amount of substitution for z ≤ 0.5, but deteriorated seriously when excessive Cr content was added (z > 0.5). The temperature coefficient of the resonant frequency (τ f ) was effectively reduced from + 63 ppm/°C to − 7.1 ppm/°C with the increase of substitution content. At last, the excellent dielectric properties with ε r  = 81.53, Q×f = 11,294 GHz and τ f  = + 39.2 ppm/°C were obtained as z = 0.5 sintered at 1420 °C for 2 h.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (Grant No. 51402039 and 51672038).

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Bin Tang, Qiuyuan Xiang, Zixuan Fang, Xia Guo & Shuren Zhang

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  1. Bin Tang
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  2. Qiuyuan Xiang
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  3. Zixuan Fang
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  4. Xia Guo
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  5. Shuren Zhang
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Correspondence to Bin Tang.

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Tang, B., Xiang, Q., Fang, Z. et al. Microwave dielectric properties of Ba3.75Nd9.5Ti18−zCr4z/3O54 ceramics. J Mater Sci: Mater Electron 29, 535–540 (2018). https://doi.org/10.1007/s10854-017-7944-9

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  • DOI: https://doi.org/10.1007/s10854-017-7944-9

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