Colossal dielectric permittivity in co-doping SrTiO3 ceramics by Nb and Mg. Issue 12 (15th August 2020)

• Record Type: Journal Article
• Authors: Zhong, Bingjie; Long, Zhongmin; Yang, Chao; Li, Yun; Wei, Xianhua
• Is Part Of: Ceramics international. Volume 46:Issue 12(2020)
• Page Start: 20565
• Page End: 20569
• Publication Date: 2020-08-15
• Subjects: Colossal permittivity -- SrTiO3 -- Co-doped -- Defect dipole; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.05.174
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: (Mg + Nb) co-doped SrTiO3 dielectric ceramics were prepared using a solid-phase synthesis method to investigate dielectric properties as a function of doping contents, temperature, and frequency. A very low dielectric loss (0.0354, at 1 kHz) and colossal permittivity (21026, at 1 kHz) were observed in Sr(Mg1/3 Nb2/3 ) x Ti1- x O3 ( x = 5%) at room temperature. The dielectric properties showed good frequency stability while three significant dielectric relaxations appear over a wide temperature range: −155 °C–500 °C. Combining with the X-ray photoelectron spectroscopy results, the mechanism of the colossal permittivity in our samples was discussed according to electron-pinned defect-dipoles model.