کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1297942 1498289 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxygen nonstoichiometry and defect chemistry of the mixed conductor La0.9Ca0.1FeO3 − δ at low oxygen partial pressure
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Oxygen nonstoichiometry and defect chemistry of the mixed conductor La0.9Ca0.1FeO3 − δ at low oxygen partial pressure
چکیده انگلیسی


• The oxygen nonstoichiometry of La0.9Ca0.1FeO3 − δ was measured as a function of pO2 and temperature via coulometric titration.
• Measurement at low pO2 reveals an n-type conducting regime.
• The reducibility of La0.9Ca0.1FeO3 − δ is similar to that of La0.9Sr0.1FeO3 − δ.

The equilibrium oxygen nonstoichiometry, δ, for the mixed ionic and electronic conducting perovskite La0.9Ca0.1FeO3 − δ (LCF91) was measured for oxygen partial pressures, pO2, between 10− 3 and 10− 21 atm and temperatures of 750 to 900 °C using a tubular, two-probe Pt|YSZ|LCF coulometric titration cell. XRD experiments confirmed that LCF91 remains a single phase perovskite under the reducing conditions of a fuel electrode, and reveal no evidence of reaction with the zirconia electrolyte. The pO2-nonstoichiometry relationship can be interpreted using a dilute-solution point-defect model involving oxygen vacancies, electrons, and electron holes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 253, 15 December 2013, Pages 88–93
نویسندگان
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