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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… Click to show full 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(Mg1/3Nb2/3)xTi1-xO3 (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.
Journal Title: Ceramics International
Year Published: 2020
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