Electrical conductivity of epitaxial La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ thin films grown by pulsed laser deposition

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• 作者：Ali Zomorrodian ; Hadi Salamati ; Zigui Lu ; Xin Chen ; Naijuan Wu ; Alex Ignatiev
• 关键词：Epitaxial thin film ; Electrical conductivity ; Surface exchange coefficient ; Relaxation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：35
• 期：22
• 页码：12443-12448
• 全文大小：767 K

文摘

Epitaxial La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) thin films have been grown successfully on single crystal LaAlO₃ substrate by pulsed laser deposition (PLD). AFM micrographs have shown a rms roughness of 5Å for the 550 °C deposited films. The films further exhibited electrical conductivities of as high as 2.3 × 10³ S cm⁻¹ at 600 °C, with an activation energy of 0.09 eV. The surface exchange coefficient (k_chem) of the epitaxial LSCF thin film, determined by electrical conductivity relaxation (ECR) technique, increased with the increasing temperature, and reached a value of 5.1 × 10⁻⁶ S cm⁻¹ at temperatures above 620 °C.