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Microwave dielectric properties of Mg4Nb2−x(Zr1/2W1/2)xO9 ceramics

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Abstract

The relationship between the microwave dielectric properties and structural characteristics of Mg4Nb2−x(Zr1/2W1/2)xO9 (0.05 ≤ x ≤ 0.15) ceramics was investigated along with the microwave dielectric properties of Mg4Nb2−x(Al1/3W2/3)xO9 (0.05 ≤ x ≤ 0.15) ceramics for comparison. The quality factors (Qf) of Mg4Nb2−x(Zr1/2W1/2)xO9 (MNZW) and Mg4Nb2−x(Al1/3W2/3)xO9 (MNAW) were proportional to the average bond valence of the Nb-sites. Mg4Nb1.95(Zr1/2W1/2)0.05O9 (Vavg.B= 3.014), which has a higher average bond valence (VB) than that of Mg4Nb2O9 (VB = 2.991), showed an excellent Qf; however, Qf decreased with further substitution. With an increase in the substitution content, the dielectric constant (K) of the specimens decreased, because the dielectric polarizability of the Nb5+(3.97 Å3) was larger than that of the substitution ions such as (Zr1/2W1/2)5+ (3.225 Å3) and (Al1/3W2/3)5+ (2.397 Å3). The temperature coefficients of resonant frequency (TCF) of the specimens decrease as the K value decreases.

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Acknowledgements

This work was supported by Kyonggi University Research Grant 2017.

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  1. Department of Advanced Materials Engineering, Kyonggi University, Suwon, Gyeonggi-do, 16227, Korea

    Jeong Hoon Kim & Eung Soo Kim

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  1. Jeong Hoon Kim
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Kim, J.H., Kim, E.S. Microwave dielectric properties of Mg4Nb2−x(Zr1/2W1/2)xO9 ceramics. J. Korean Ceram. Soc. 57, 314–320 (2020). https://doi.org/10.1007/s43207-020-00035-y

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