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Journal of Advanced Ceramics 2023, 12(11): 2053-2061 https://doi.org/10.26599/JAC.2023.9220807
Research Article | Open Access | Issue | Published: 29 November 2023

A novel Na1−xKxTaO3 perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Show Author's Information Liu Tanga,b,  Hongcheng Yangb,c,  Enzhu Lia,b( ),  Chaowei Zhonga,b( )
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 611731, China
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
Keywords:
perovskite, high permittivity, high positive temperature coefficient, Na1−xKxTaO3 ceramics
Cite this article:
Tang L, Yang H, Li E, et al. A novel Na1−xKxTaO3 perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient. Journal of Advanced Ceramics, 2023, 12(11): 2053-2061. https://doi.org/10.26599/JAC.2023.9220807
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Abstract Full text Electronic supplementary material About this article

A novel Na1−xKxTaO3 (x = 0, 0.025, 0.05, 0.075, 0.1, and 0.15) ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method. All samples were determined to be pure phase orthorhombic NaTaO3 structure of space group Pmcn, and larger grain and lower porosity were observed after adding an appropriate amount of K+ ions. The Q × f value is majored by the packing fraction and grain size, while the value of τf is influenced by Ta–O bond valence. The Na0.95K0.05TaO3 ceramic possesses excellent dielectric properties of εr = 164.29, Q × f = 9091 GHz (f = 3.15 GHz), tanδ = 3.46×10–4, τf = +809.52 ppm/℃, sintered at 1550 ℃. Compared with NaTaO3 ceramics, the Na1−xKxTaO3 ceramics prepared in this study demonstrate higher dielectric constants and higher positive temperature coefficients, which are promising for device miniaturization and τf compensators.


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About this article

A novel Na1−xKxTaO3 perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Show Author's information Liu Tanga,b, Hongcheng Yangb,c, Enzhu Lia,b( ), Chaowei Zhonga,b( )
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 611731, China
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China

Abstract

A novel Na1−xKxTaO3 (x = 0, 0.025, 0.05, 0.075, 0.1, and 0.15) ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method. All samples were determined to be pure phase orthorhombic NaTaO3 structure of space group Pmcn, and larger grain and lower porosity were observed after adding an appropriate amount of K+ ions. The Q × f value is majored by the packing fraction and grain size, while the value of τf is influenced by Ta–O bond valence. The Na0.95K0.05TaO3 ceramic possesses excellent dielectric properties of εr = 164.29, Q × f = 9091 GHz (f = 3.15 GHz), tanδ = 3.46×10–4, τf = +809.52 ppm/℃, sintered at 1550 ℃. Compared with NaTaO3 ceramics, the Na1−xKxTaO3 ceramics prepared in this study demonstrate higher dielectric constants and higher positive temperature coefficients, which are promising for device miniaturization and τf compensators.

Keywords: perovskite, high permittivity, high positive temperature coefficient, Na1−xKxTaO3 ceramics

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Publication history

Received: 26 June 2023
Revised: 11 September 2023
Accepted: 12 September 2023
Published: 29 November 2023
Issue date: November 2023

Copyright

© The Author(s) 2023.

Acknowledgements

This work was supported by the National Key R&D Program (No. 2022YFB2807405), the Natural Science Foundation of Sichuan Province (No. 2022NSFSC1959), and the Open Foundation of National Engineering Research Center of Electromagnetic Radiation Control Materials (No. ZYGX2020K009-1).

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