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Journal of Advanced Ceramics

, Volume 8, Issue 2, pp 228–237 | Cite as

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

  • Mengjuan Wu
  • Yingchun ZhangEmail author
  • Maoqiao Xiang
Open Access
Research Article
  • 23 Downloads

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)CoTiNb2O8xZnNb2O6 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 × f of ZnNb2O6 ceramics, the increase of ZnNb2O6 content also led to the lower sintering temperatures and the higher Q × f values. The τf value was reduced from +108.04 (x = 0) to − 49.31 ppm/°C (x = 1). Among them, high density 0.5CoTiNb2O8-0.5ZnNb2O6 ceramics were obtained at 1175 °C with excellent microwave dielectric properties of εr 39.2, Q × f 40013 GHz, and τf+3.57 ppm/°C.

Keywords

solid-state reaction (1−x)CoTiNb2O8xZnNb2O6 ceramics crystal structure microwave dielectric property 

Notes

Acknowledgements

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

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Authors and Affiliations

  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.State Key Laboratory of Multiphase Complex Systems, Institute of Process EngineeringChinese Academy of SciencesBeijingChina

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