Title of article
Oxygen stoichiometry of Sr0.97(Ti,Fe)O3−δ materials
Author/Authors
Ferreira، نويسنده , , A.A.L. and Abrantes، نويسنده , , J.C.C. and Jurado، نويسنده , , J.R. and Frade، نويسنده , , J.R.، نويسنده ,
Issue Information
دوهفته نامه با شماره پیاپی سال 2000
Pages
4
From page
761
To page
764
Abstract
Thermogravimetric analysis and a coulometric titration technique were used to measure the relative changes in oxygen stoichiometry of Sr0.97(Ti,Fe)O3−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 Fe3+ and Fe4+ 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.
Keywords
Stoichiometry , Thermogravimetry , defect chemistry , Coulometric titration
Journal title
Solid State Ionics
Serial Year
2000
Journal title
Solid State Ionics
Record number
1707646
Link To Document