Abstract
Thermogravimetric analysis and a coulometric titration technique were used to measure the relative changes in oxygen stoichiometry of Sr 0.97(Ti,Fe)O 3− δ materials with temperature and oxygen partial pressure, and these results were used to re-examine the defect chemistry. These materials undergo significant weight gain on cooling which was attributed to changes in valence of Fe ions. The oxygen gain attained on cooling from 1300°C to room temperature indicates that Fe 3+ and Fe 4+ coexist in these materials, and that the concentration of oxygen vacancies remains relatively high in wide ranges of working conditions but may vary with temperature, and/or oxygen partial pressure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
