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Effect of Co2+ Substitution on the Microwave Dielectric Properties of LiZnPO4 Ceramics

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Abstract

The microstructure, sintering behavior, and microwave dielectric properties of LiZn1−xCoxPO4 (x = 0.00–0.10) ceramics were investigated. All these materials were synthesized by the traditional solid-state reaction method. Component and microstructure of the ceramics were verified by x-ray diffraction (XRD) patterns and scanning electron microscopy (SEM), respectively. The substitution of Co2+-ion to Zn2+-ion would improve the densification level of composite ceramics, and the microwave dielectric properties would be changed accordingly. An excellent microwave dielectric property of LiZn1−xCoxPO4 (x = 0.00–0.10) was achieved when x = 0.07 (ɛr = 5.43, Q × f = 35,446 GHz at 15 GHz, τf = − 77.4 ppm/°C). In order to achieve reliable thermal stability, Pb1.5Nb2O6.5 was used to adjust its τf value. The LiZn0.93Co0.07PO4 ceramics with 6 vol.% Pb1.5Nb2O6.5 sintered at 750°C for 4 h shows a near-zero τf value of − 4.4 ppm/°C, ɛr = 6.09, Q × f = 14,305 GHz (at 15 GHz), and there was no chemical reaction between Pb1.5Nb2O6.5 and LiZn0.93Co0.07PO4. The composite ceramics are promising materials for millimeter-wave device applications in the field of low temperature co-fired ceramics.

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Acknowledgements

The authors would like to thank National key R&D program No. 2017YFB0406300, Sichuan science and technology supporting program Nos. 2016GZ0245 and 2016GZ0261, Guizhou science and technology major projects [2016] No. 3011, and the Dongguan entrepreneurial talent program.

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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

    Rui Peng, Yuanxun Li, Guoliang Yu & Yongcheng Lu

  2. China Zhenhua (Group) Electronic Company, Guiyang, 550018, China

    Sheng Li

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  1. Rui Peng
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  2. Yuanxun Li
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  3. Guoliang Yu
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  4. Yongcheng Lu
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Correspondence to Yuanxun Li.

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Peng, R., Li, Y., Yu, G. et al. Effect of Co2+ Substitution on the Microwave Dielectric Properties of LiZnPO4 Ceramics. J. Electron. Mater. 47, 7281–7287 (2018). https://doi.org/10.1007/s11664-018-6665-z

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  • DOI: https://doi.org/10.1007/s11664-018-6665-z

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