Compositional effects of Nb site on microwave dielectric properties of Mg-4(Nb,Ta,Sb)(2)O-9 ceramics

Kim Eung Soo; Kim Jae Min

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Compositional effects of Nb site on microwave dielectric properties of Mg-4(Nb,Ta,Sb)(2)O-9 ceramics

机译：Compositional effects of Nb site on microwave dielectric properties of Mg-4(Nb,Ta,Sb)(2)O-9 ceramics

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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 degrees 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 Mg-4(NbxTaySbz)O-9 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.

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《journal of the korean ceramic society》 |2021年第5期|583-589|共7页
作者
Kim Eung Soo; Kim Jae Min;
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Kyonggi Univ;

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正文语种英语
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Corundum structure; Microwave dielectric properties; Bond valence; Packing fraction; Oxygen octahedral distortion; BOND-VALENCE PARAMETERS; CRYSTAL-STRUCTURE; REFINEMENT;

Compositional effects of Nb site on microwave dielectric properties of Mg-4(Nb,Ta,Sb)(2)O-9 ceramics

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