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(1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics were prepared via the conventional solid-state reaction route with the aim of reducing the τf value and improving the thermal stability. The phase composition and the microstructure were investigated using X-ray diffraction, Raman spectra, and scanning electron microscopy. A set of phase transitions which were induced by composition had been confirmed via the sequence: rutile structure→coexistence of rutile and columbite phase→columbite phase. For (1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics, the addition of ZnNb2O6 content (x = 0-1) led to the decrease of εr from 62.98 to 23.94. As a result of the high Q × ƒ of ZnNb2O6 ceramics, the increase of ZnNb2O6 content also led to the lower sintering temperatures and the higher Q × ƒ values. The τf value was reduced from +108.04 (x = 0) to - 49.31 ppm/℃ (x = 1). Among them, high density 0.5CoTiNb2O8-0.5ZnNb2O6 ceramics were obtained at 1175 ℃ with excellent microwave dielectric properties of εr 39.2, Q × ƒ 40013 GHz, and τf + 3.57 ppm/℃.


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Synthesis, characterization and dielectric properties of a novel temperature stable (1-x)CoTiNb2O8-xZnNb2O6 ceramic

Show Author's information Mengjuan WUaYingchun ZHANGa( )Maoqiao XIANGb
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Abstract

(1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics were prepared via the conventional solid-state reaction route with the aim of reducing the τf value and improving the thermal stability. The phase composition and the microstructure were investigated using X-ray diffraction, Raman spectra, and scanning electron microscopy. A set of phase transitions which were induced by composition had been confirmed via the sequence: rutile structure→coexistence of rutile and columbite phase→columbite phase. For (1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics, the addition of ZnNb2O6 content (x = 0-1) led to the decrease of εr from 62.98 to 23.94. As a result of the high Q × ƒ of ZnNb2O6 ceramics, the increase of ZnNb2O6 content also led to the lower sintering temperatures and the higher Q × ƒ values. The τf value was reduced from +108.04 (x = 0) to - 49.31 ppm/℃ (x = 1). Among them, high density 0.5CoTiNb2O8-0.5ZnNb2O6 ceramics were obtained at 1175 ℃ with excellent microwave dielectric properties of εr 39.2, Q × ƒ 40013 GHz, and τf + 3.57 ppm/℃.

Keywords:

solid-state reaction, (1-x)CoTiNb2O8-xZnNb2O6 ceramics, crystal structure, microwave dielectric property
Received: 11 October 2018 Revised: 21 November 2018 Accepted: 29 November 2018 Published: 13 June 2019 Issue date: June 2019
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Publication history

Received: 11 October 2018
Revised: 21 November 2018
Accepted: 29 November 2018
Published: 13 June 2019
Issue date: June 2019

Copyright

© The author(s) 2019

Acknowledgements

This work has been financially supported by the National Natural Science Foundation of China (No. 51772022).

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