Effect of phase structure on electrical conductivity of CexGd1−xO2−δ solid electrolytes

✍ Scribed by Ping Fang; Shi-Ping Li; Ji-Qing Lu; Zhi-Ying Pu; Shu-Qiong Cen; Meng-Fei Luo

• Book ID: 103844486
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 498 KB
• Volume: 164
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2009.08.006

✦ Synopsis

A series of Ce x Gd 1-x O 2-ı samples were prepared by a citrate method. Phase structure and AC impedance spectroscopy of these electrolytes were studied. It was found that doping of Gd 3+ into CeO 2 could help to form solid solutions, which is beneficial to the formation of more oxygen vacancies and consequently improves electrical conductivity of the electrolytes. The highest conductivity was obtained on a Ce 0.6 Gd 0.4 O 2-ı electrolyte. Arrhenius plot of the Ce 0.6 Gd 0.4 O 2-ı electrolyte shows an inflexion at 600 • C, implying that the electrolyte has dual mechanisms of electrical conductivity. It was also found that the phase transition has influence on the electrical conductivity, as the activation energy increases when the electrolytes transit from a mixed CeO 2 -based and Gd 2 O 3 -based solid solution phases to only CeO 2 -based solid solution phase.