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      Synthesis, characterization and dielectric properties of a novel temperature stable (1– x)CoTiNb 2O 8xZnNb 2O 6 ceramic

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          Abstract

          (1– x)CoTiNb 2O 8xZnNb 2O 6 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)CoTiNb 2O 8xZnNb 2O 6 microwave dielectric ceramics, the addition of ZnNb 2O 6 content ( x = 0–1) led to the decrease of ε r from 62.98 to 23.94. As a result of the high Q × f of ZnNb 2O 6 ceramics, the increase of ZnNb 2O 6 content also led to the lower sintering temperatures and the higher Q × f values. The τ f value was reduced from +108.04 ( x = 0) to − 49.31 ppm/°C ( x = 1). Among them, high density 0.5CoTiNb 2O 8–0.5ZnNb 2O 6 ceramics were obtained at 1175 °C with excellent microwave dielectric properties of ε r 39.2, Q × f 40013 GHz, and τ f + 3.57 ppm/°C.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 June 2019
          01 October 2019
          : 8
          : 2
          : 228-237
          Affiliations
          aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
          bState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
          Author notes
          *Corresponding author: Yingchun ZHANG, E-mail: zycustb@ 123456163.com
          Article
          s40145-018-0308-y
          10.1007/s40145-018-0308-y
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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