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Crystal phase, microstructure and microwave properties of Ba2VxO7 (1.85 ≤ x ≤ 2.05) ceramics

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Abstract

Crystal phase, microstructure and microwave properties of Ba2VxO7 (1.85 ≤ x ≤ 2.05) ceramics were researched. XRD results revealed that the single-phase Ba2V2O7 was formed when x ≥ 2, while the second-phase Ba3V2O8 was observed with 1.85 ≤ x < 2. Rietveld refinement demonstrated that the amount of Ba3V2O8 increased with the decline of vanadium content. Further, HRTEM observation verified that the co-existence of Ba3V2O8 and Ba2V2O7 in the sample for x = 1.9. Meanwhile, SAED pattern confirmed the triclinic structure of Ba2V2O7. The τf value presented a tendency of shifting to zero with the augment of Ba3V2O8. FWHM of the highest peak 884 cm−1 in Raman spectra proved that an appropriately absent vanadium ions improved the quality factor. The satisfied microwave properties of εr = 10.89, Q × f = 55,047 GHz (at 10 GHz), and τf = − 43.4 ppm/°C were achieved for Ba2V1.9O7 ceramic.

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Authors and Affiliations

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

    Yaping Deng, Pengyu Yao & Bo Li

  2. State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu, China

    Bo Li

  3. National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, China

    Bo Li

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  1. Yaping Deng
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  2. Pengyu Yao
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Correspondence to Bo Li.

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Deng, Y., Yao, P. & Li, B. Crystal phase, microstructure and microwave properties of Ba2VxO7 (1.85 ≤ x ≤ 2.05) ceramics. J Mater Sci: Mater Electron 31, 7053–7059 (2020). https://doi.org/10.1007/s10854-020-03272-3

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