On the Sol-Gel Synthesis and Structure, Electronic and Ionic Conductivities and Impedance Behavior of Y, Fe Co-Doped SrTiO₃ Mixed Conductor

Abstract:

A single phase perovskite, Y_xSr_1−xTi_0.6Fe_0.4O_3-δ (x= 0.06-0.09), was fabricated at 1350°C in air by sol-gel method. The effects of Y-and Fe-doping into SrTiO₃ on phase structure, electrical conductivity, ionic conductivity and its impedance behavior were investigated. The optimized Y_0.07Sr_0.93Fe_0.4Ti_0.6O_3-δ sample exhibits an electrical conductivity of 0.135 S·cm^-1 at 800 °C. Y-doping decreases the migration energy for oxygen ions, leading to a significant increase in ionic conductivity. The ionic conductivity of Y_0.09Sr_0.91Ti_0.6Fe_0.4O_3-δ sample varies from 0.0052 S· cm^-1 at 600°C to 0.02 S·cm^-1 at 800°C. Impedance characteristics over a wide frequency range of 0.01Hz-100 KHz reveal that the resistance of ionic conduction is predominantly influenced by grain boundary, the relaxation time of which decreases with increase of Y-doping amount.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 774-781
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.774
• Online since: August 2018
• Authors: Ke Shan, Feng Rui Zhai, Nan Li*, Zhong Zhou Yi
• Keywords: Electrical Conductivity, Impedance, Ionic Conductivity, Relaxation, Y_xSr_1−xTi_0.6Fe_0.4O_3-δ

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