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J. Korean Ceram. Soc. > Volume 58(5); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(5): 583-589.
doi: https://doi.org/10.1007/s43207-021-00133-5
Compositional effects of Nb site on microwave dielectric properties of Mg4(Nb,Ta,Sb)2 O9 ceramics
Eung Soo Kim, Jae Min Kim
Department of Materials Engineering, Kyonggi University, Suwon 16227, Gyeonggi-do, Korea
Correspondence  Eung Soo Kim ,Email: eskim@kyonggi.ac.kr
Received: April 26, 2021; Revised: July 24, 2021   Accepted: July 28, 2021.  Published online: September 30, 2021.
The relationships between the structural characteristics and the microwave dielectric properties of the specimens with stoichiometric and non-stoichiometric substitutions were investigated. A single phase with a corundum structure was observed for all compositions of specimens sintered at 1400 °C for 5 h. The microwave dielectric properties of the sintered specimens strongly depended on the type and content of pentavalent cations (e.g., Na5+, Ta5+, Sb5+) in Mg4(NbxTaySbz)O9 ceramics. The Qf value of specimens with stoichiometric substitutions at the Nb site of Mg4Nb2O9 depended on the B-site (i.e., Nb site) bond valence, whereas that of specimens with non-stoichiometric substitutions depended on the packing fraction of the unit cell. The dielectric constants (K) of the specimens did not change remarkably with the composition, and the temperature coefficient of resonant frequency (TCF) depended on the average octahedral distortion.
Key words: Corundum structure · Microwave dielectric properties · Bond valence · Packing fraction · Oxygen octahedral distortion
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