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Extrinsic effects on microwave dielectric properties of high-Q MgZrTa2O8 ceramics

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Abstract

MgZrTa2O8 ceramics with excellent microwave dielectric properties had been prepared through conventional mixed oxide route. All the sintered samples exhibited a single phase with wolframite structure type belonged to P2/c (C 4 2h ) space group. The Raman spectrum revealed a similar lattice vibration in all samples with different sintering temperature. Emphatically, the extrinsic effects on microwave dielectric properties had also been investigated. The microwave dielectric properties of MgZrTa2O8 ceramics presented a significant dependence on the sintering condition. The porosity-corrected permittivity (ε-pc) was calculated to investigate the influence of the porosity to the dielectric constant (εr). For the high-dense MgZrTa2O8 ceramics, the main factors which had influences on quality factors (Q × f) were the grain size and grain-size distribution. The temperature coefficient of resonant frequency (τ f ) was depended on the dielectric constant and pores. The typical microwave dielectric properties of MgZrTa2O8 ceramics were εr = 22.76, Q × f = 131,500 GHz, τ f  = −33.81 ppm/°C, sintered at 1475 °C.

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Acknowledgments

This work is supported by the projects from the Fundamental Research Funds for the Central Universities of China University of Mining and Technology under Grant No. 2014QNA69, Laboratory Opening Fund of China University of Mining and Technology under Grant No. 2014208 and the National Natural Science Foundation of China under Grant No. 51402353.

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  1. College of Science, China University of Mining and Technology, Xuzhou, 221008, China

    Wang-Suo Xia, Lan-Yang Zhang, Ying Wang, Shao-En Jin, Yu-Pei Xu, Ze-Wen Zuo & Li-Wei Shi

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Xia, WS., Zhang, LY., Wang, Y. et al. Extrinsic effects on microwave dielectric properties of high-Q MgZrTa2O8 ceramics. J Mater Sci: Mater Electron 27, 11325–11330 (2016). https://doi.org/10.1007/s10854-016-5256-0

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