کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1297954 | 1498289 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: High temperature electrical behavior of CaTi1 − xFexO3 − δ (x = 0–0.5). Oxygen-ion, electronic and proton conductivity High temperature electrical behavior of CaTi1 − xFexO3 − δ (x = 0–0.5). Oxygen-ion, electronic and proton conductivity](/preview/png/1297954.png)
• Total and electronic conductivity were measured as functions of x, T and pO2.
• Transport numbers of oxygen ions and protons were measured.
• Electrical behavior was described in the frame of the model of defect formation.
• Ambipolar conductivity of CaTi1 − xFexO3 − d was calculated.
Total electrical conductivity and contributions of different charge carriers such as oxygen ions, protons, electrons and holes in CaTi1 − xFexO3 − δ (x = 0–0.5) were measured as functions of temperature, oxygen partial pressure and iron content. Total electrical conductivity measurements were made by means of the four-probe dc technique. Partial electronic conductivity was studied by the Hebb–Wagner polarization method. Transport numbers of oxygen ions and protons in CaTi1 − xFexO3 − δ were measured by the EMF method. It has been shown that CaTi1 − xFexO3 − δ is a mixed oxygen-ion and electronic conductor at small iron concentrations, and it is a predominantly electronic conductor at large iron contents. Proton conductivity of CaTi1 − xFexO3 − δ is negligibly small. Ambipolar conductivity of CaTi1 − xFexO3 − δ was calculated. With known ambipolar conductivity a profile of the oxygen chemical potential inside CaTi1 − xFexO3 − δ under applied oxygen partial pressure gradient can be figured out.
Journal: Solid State Ionics - Volume 253, 15 December 2013, Pages 169–174