Electrical Properties of Y sub(0.06) Sr sub(0.94) Ti sub(0.6) Fe sub(0.4) O sub(3-[delta])-YSZ Composites as Electrode Materials

• Published in: Key Engineering Materials Vol. 697; pp. 327 - 330
• Main Authors: Shan, Ke, Guo, Xing Min, Zhai, Feng Rui, Yi, Zhong Zhou
• Format: Journal Article
• Language: English
• Published: 01.07.2016
• Subjects: Conductivity; Electrical conductivity; Electrical properties; Electrical resistivity; Ionic conductivity; Resistivity; X-ray diffraction; Yttria stabilized zirconia
• ISBN: 9783035710656; 3035710651
• ISSN: 1013-9826; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.697.327

Y0.06Sr0.94Ti0.6Fe0.4O3-[delta]-YSZ composites were prepared by mixing Y, Fe co-doped SrTiO3 (Y0.06Sr0.94Ti0.6Fe0.4O3-[delta] known as YSTF) and 8 mol% Y2O3 stabilized ZrO2 (YSZ) in different weight fractions. The phase stability, phase compatibility, microstructure and mixed ionic-electronic conductivity of composites were investigated. Phase analysis by XRD showed no clearly detectable secondary phases. The electrical conductivity measurement on the YSTF-YSZ composites showed a drastic decrease in total electrical and ionic conductivities when more than 10 wt% of YSZ was used in the composites. The total electrical conductivity was 0.102 S/cm for Y0.06Sr0.94Ti0.6Fe0.4O3-[delta] and 0.043 S/cm for YSTF-20YSZ at 700 oC, respectively. The value at 700 oC is approximately 2.4 times higher than that of YSTF-20YSZ. The ionic conductivity of Y0.06Sr0.94Ti0.8Fe0.2O3-[delta] varies from 0.015S/cm at 700 oC to 0.02 S/cm at 800 oC, respectively. The value at 800[degrees]C is approximately 12.5 times higher than YSTF-20YSZ. The ion transference numbers of YSTF-YSZ composites vary from 0.14 to 0.28 at 800 [degrees]C.