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Journal of Advanced Ceramics 2023, 12(12): 2247-2256 https://doi.org/10.26599/JAC.2023.9220815
Research Article | Open Access | Issue | Published: 04 January 2024

Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics

Show Author's Information Jinghan Cai,  Junlei Qi,  Yueyang Yang,  Xinyue Zhang,  Yuan-Hua Lin( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Keywords:
SrTiO3, defect dipoles, ultralow dielectric loss, colossal permittivity (CP)
Cite this article:
Cai J, Qi J, Yang Y, et al. Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics. Journal of Advanced Ceramics, 2023, 12(12): 2247-2256. https://doi.org/10.26599/JAC.2023.9220815
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Abstract Full text About this article

Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNbxO3 (x = 0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere. All samples show excellent dielectric properties with giant permittivity (> 3.5×104) and low dielectric loss (< 0.01). SrTiNb0.003O3 ceramic exhibits a colossal permittivity of 4.6×104 and an ultralow dielectric loss of 0.005 (1 kHz, room temperature) as well as great temperature stability in the range of (−60)–160℃. The mechanism of the presented colossal permittivity (CP) properties is investigated by conducting X-ray photoelectron spectroscopy (XPS) and analyzing activation energies. The results indicate that the introduction of Nb5+ and the reducing sintering atmosphere together generated the formation of Ti3+ and VO··. These defects further form TiTi′−VO··−TiTi′ defect dipoles, contributing to the coexisting giant permittivity and low dielectric loss in Nb-doped SrTiO3 (STN) ceramics.


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About this article

Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics

Show Author's information Jinghan Cai, Junlei Qi, Yueyang Yang, Xinyue Zhang, Yuan-Hua Lin( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNbxO3 (x = 0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere. All samples show excellent dielectric properties with giant permittivity (> 3.5×104) and low dielectric loss (< 0.01). SrTiNb0.003O3 ceramic exhibits a colossal permittivity of 4.6×104 and an ultralow dielectric loss of 0.005 (1 kHz, room temperature) as well as great temperature stability in the range of (−60)–160℃. The mechanism of the presented colossal permittivity (CP) properties is investigated by conducting X-ray photoelectron spectroscopy (XPS) and analyzing activation energies. The results indicate that the introduction of Nb5+ and the reducing sintering atmosphere together generated the formation of Ti3+ and VO··. These defects further form TiTi′−VO··−TiTi′ defect dipoles, contributing to the coexisting giant permittivity and low dielectric loss in Nb-doped SrTiO3 (STN) ceramics.

Keywords: SrTiO3, defect dipoles, ultralow dielectric loss, colossal permittivity (CP)

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Publication history

Received: 04 August 2023
Revised: 14 September 2023
Accepted: 03 October 2023
Published: 04 January 2024
Issue date: December 2023

Copyright

© The Author(s) 2023.

Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2021YFB3800601) and the Basic Science Center Project of the National Natural Science Foundation of China (Grant No. 52388201).

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