Frequency and temperature independent (Nb0.5Ga0.5)x(Ti0.9Zr0.1)1-xO2 ceramics with giant dielectric permittivity and low loss

Xia, Weimin; Liu, Yiming; Wang, Ge; Li, Jinglei; Cao, Congjun; Hu, Qingyuan; Chen, Yuanqing; Lu, Zhilun; Wang, Dawei

Abstract

Nb5+ and Ga3+ co-doped Ti0.9Zr0.1O2 ceramics were synthesized using the conventional solid-state reaction method. Single rutile-liked phase of octahedron structure were identified for all compositions in (Nb0.5Ga0.5)x(Ti0.9Zr0.1)1-xO2 (NGT) with x = 0.01 to 0.10 by X-ray diffraction patterns coupled with Rietveld refinement. Microstructural scanning image, together with energy dispersive x-ray spectroscopy (EDX), revealed good chemical homogeneity in NGT samples. A giant dielectric permittivity of 5 × 104 and a low loss of 0.02 was obtained in NGT with x = 0.01 due to the contribution of electron-pinned and defect-dipole effect. Furthermore, a temperature (-20–120 °C), frequency (0.1–104 Hz) and bias electric field (100–200 V/mm) independent dielectric permittivity and loss was found in this composition, which is critical for potential applications of supercapacitors.

Citation

Xia, W., Liu, Y., Wang, G., Li, J., Cao, C., Hu, Q., Chen, Y., Lu, Z., & Wang, D. (2020). Frequency and temperature independent (Nb0.5Ga0.5)x(Ti0.9Zr0.1)1-xO2 ceramics with giant dielectric permittivity and low loss. Ceramics International, 46(3), 2954-2959. https://doi.org/10.1016/j.ceramint.2019.09.292

• Journal Article Type: Article
• Acceptance Date: Sep 30, 2019
• Online Publication Date: Oct 1, 2019
• Publication Date: 2020-02
• Deposit Date: Oct 23, 2021
• Journal: Ceramics International
• Print ISSN: 0272-8842
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 3
• Pages: 2954-2959
• DOI: https://doi.org/10.1016/j.ceramint.2019.09.292
• Keywords: Giant dielectric permittivity, Frequency-independent, DC bias
• Public URL: http://researchrepository.napier.ac.uk/Output/2816007