Electrical conduction behavior of mixed ionic-electronic conductor Y_0.08Sr_0.92Ti_{1 − x}Sc_xO_{3 − δ}

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• 作者：Ke Shan^a ; ^b ; ^{shankekeshan@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhong-Zhou Yi^a ; ^b ; ^{yizhongzhou@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Y0.08Sr0.92Ti1  ; &minus ;   ; xScxO3  ; &minus ;   ; δ ; Mixed ionic-electronic conductor ; Ionic conductivity ; Charge compensation mechanism
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：114
• 期：Complete
• 页码：70-73
• 全文大小：580 K

文摘

Y_0.08Sr_0.92Ti_1 − xSc_xO_3 − δ was synthesized via sol–gel method. With the Sc-doping amount increasing, the electrical conductivity of Y_0.08Sr_0.92Ti_1 − xSc_xO_3 − δ increased in 400–900 °C and the ionic conductivity increased between 600 and 900 °C. The optimized Y_0.08Sr_0.92Ti_0.93Sc_0.07O_3 − δ sample exhibits an electrical conductivity in the order of 0.058–0.085 S·cm^− 1 at 400–900 °C. The ionic conductivity for Y_0.08Sr_0.92Ti_0.93Sc_0.07O_3 − δ was 0.027 S·cm^− 1 and increased about 140% compared with Y_0.08Sr_0.92Ti_0.97Sc_0.03O_3 − δ at 800 °C. Sc-doping increased the oxygen vacancy concentration and decreased the oxygen migration energy, therefore enhancing the conduction process of oxygen ions in Y_0.08Sr_0.92Ti_1 − xSc_xO_3 − δ. The possible charge compensation mechanism of Y_0.08Sr_0.92Ti_1 − xSc_xO_3 − δ can be described as Y_0.08Sr_0.92Sc_x^3 +Ti_{0.92 − 2δ − x1}^4 +Ti_{0.08 + 2δ ‐ x2}^3 +O_{3 − (δ + x1/2)}(x = x₁ + x₂).