Abstract
This work systematically investigates the oxygen nonstoichiometry, defect structure and mass/charge transport properties of Ba0.95La0.05FeO3−δ
(BLF). Thermogravimetric measurement and coulometric titration were performed to determine change in oxygen nonstoichiometry (δ) with oxygen partial pressure (
P
O
2
) in 10−17 ≤ (
P
O
2
/atm) ≤ 0.21 and 850 ≤ (T/°C)≤900 range. The δ−
P
O
2
−T plot showed “S-type” shape with a crossover plateau around δ ≈ 0.475. Defect modelling was used to explain the nonstoichiometry data and partial molar thermodynamic quantities for oxygen were determined. The DC 4-probe conductivity measurement was performed which showed a typical semiconductor-to-metal transition with temperature around the conductivity maxima at 450 °C. Electrical conductivity relaxation (ECR) measurement was performed to extract partial ionic conductivity, chemical diffusivity and surface exchange kinetics of oxygen ion by using Nernst-Einstein equation and Fick’s law. Isothermal chemical expansion was measured by dilatometry measurement in the range of 10−2 ≤ (
P
O
2
/atm) ≤ 0.21 and 850 ≤ (T/°C) ≤ 950.
Funder
Korea Electric Power Corporation
National Research Foundation of Korea
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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