Low-temperature dielectric and impedance properties of SrSn0.2Ti0.8O3 ceramics
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Tin-doped and undoped perovskite SrTiO3 ceramics were synthesized by solid-state reaction method using SrCO3, TiO2 andSnO2 powders as raw materials. When the samples sintered at 1400 ℃, the SrSn0.2Ti0.8O3 and SrTiO3 ceramics all crystallizedin cubic structures. The lattice parameters of SrSn0.2Ti0.8O3 are slightly larger than that of SrTiO3 due to the bigger size ofSn4+ ions. The frequency-dependent dielectric and impedance properties of SrSn0.2Ti0.8O3 ceramics were investigated in thetemperature range of 300-100 K. The obtained value of low-temperature dielectric permittivity is larger than 10000, and thatof dielectric loss is lower than 0.018 at f = 1 kHz. The impedance spectra were used to show the grains and grain boundarieseffects in SrSn0.2Ti0.8O3 ceramics. The calculated electrical conductivity demonstrates the semiconductor properties of theprepared samples. The results indicate that SrSn0.2Ti0.8O3 ceramics have potential applications in dielectric and electronicdevices.
Abstract
Tin-doped and undoped perovskite SrTiO3 ceramics were synthesized by solid-state reaction method using SrCO3, TiO2 andSnO2 powders as raw materials. When the samples sintered at 1400 ℃, the SrSn0.2Ti0.8O3 and SrTiO3 ceramics all crystallizedin cubic structures. The lattice parameters of SrSn0.2Ti0.8O3 are slightly larger than that of SrTiO3 due to the bigger size ofSn4+ ions. The frequency-dependent dielectric and impedance properties of SrSn0.2Ti0.8O3 ceramics were investigated in thetemperature range of 300-100 K. The obtained value of low-temperature dielectric permittivity is larger than 10000, and thatof dielectric loss is lower than 0.018 at f = 1 kHz. The impedance spectra were used to show the grains and grain boundarieseffects in SrSn0.2Ti0.8O3 ceramics. The calculated electrical conductivity demonstrates the semiconductor properties of theprepared samples. The results indicate that SrSn0.2Ti0.8O3 ceramics have potential applications in dielectric and electronicdevices.
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