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

Mengjuan WU; Yingchun ZHANG; Maoqiao XIANG

doi:10.1007/s40145-018-0308-y

Journal of Advanced Ceramics 2019, 8(2): 228-237 https://doi.org/10.1007/s40145-018-0308-y

Research Article |

Open Access | Issue | Published: 13 June 2019

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

Show Author's Information Hide Author's Information Mengjuan WU^{^a}, Yingchun ZHANG^{^a}(

), Maoqiao XIANG^{^b}

a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

b State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Keywords:

crystal structure, solid-state reaction, (1-x)CoTiNb₂O₈-xZnNb₂O₆ ceramics, microwave dielectric property

Cite this article:

WU M, ZHANG Y, XIANG M. Synthesis, characterization and dielectric properties of a novel temperature stable (1-x)CoTiNb₂O₈-xZnNb₂O₆ ceramic. Journal of Advanced Ceramics, 2019, 8(2): 228-237. https://doi.org/10.1007/s40145-018-0308-y

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Abstract

(1-x)CoTiNb₂O₈-xZnNb₂O₆ microwave dielectric ceramics were prepared via the conventional solid-state reaction route with the aim of reducing the τ_f 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 ε_r 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 τ_f 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 ε_r 39.2, Q × ƒ 40013 GHz, and τ_f + 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 Hide Author's Information Mengjuan WU^{^a}, Yingchun ZHANG^{^a}(

), Maoqiao XIANG^{^b}

a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

b State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Abstract

Keywords: crystal structure, solid-state reaction, (1-x)CoTiNb₂O₈-xZnNb₂O₆ ceramics, microwave dielectric property

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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

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Acknowledgements

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

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