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Effect of Isovalent Substitution on Microwave Dielectric Properties of Mg4Nb2O9 Ceramics

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Abstract

The dependence of microwave dielectric properties on the isovalent substitution of (Sn 4+1/2 W1/26+)5+ (electronegativity difference from O2−, X = 2.16) and (Ti 4+1/2 W1/26+)5+ (X = 1.95), with higher electronegativity differences than Nb5+ (X = 1.6) at Nb5+-sites of Mg4Nb2O9 ceramics was investigated. As expected from the electronegativity values, the quality factor of the specimens reached the highest value (274000 GHz) at X = 0.05 because Mg4Nb1.95(Sn1/2W1/2)0.05 O9 had a higher average bond valence than the other specimens. The dielectric constants (K) of the specimens were affected by the theoretical dielectric polarizability. The K value of specimens decreased with increasing x because Nb5+ has a higher dielectric polarizability (3.97 Å3) than the substitution ions such as (Sn1/2W1/2)5+ (3.015 Å3) and (Ti1/2W1/2)5+ (3.065 Å3). The effects of the structural characteristics with isovalent substitution on the microwave dielectric properties are also discussed.

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Acknowledgment

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (2015R1D1A1A09061528).

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  1. Department of 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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  2. Eung Soo Kim
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Kim, J.H., Kim, E.S. Effect of Isovalent Substitution on Microwave Dielectric Properties of Mg4Nb2O9 Ceramics. J. Electron. Mater. 48, 2411–2417 (2019). https://doi.org/10.1007/s11664-019-06995-0

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  • DOI: https://doi.org/10.1007/s11664-019-06995-0

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