التفاصيل البيبلوغرافية
| العنوان: |
Oxygen nonstoichiometry and exchange kinetics of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 − δ |
| المؤلفون: |
Bucher, Edith, Egger, Andreas, Ried, Peter, Sitte, Werner, Holtappels, Peter |
| بيانات النشر: |
Elsevier |
| سنة النشر: |
2008 |
| مصطلحات موضوعية: |
perovskite oxide, BSCF, oxygen nonstoichiometry, oxygen exchange, conductivity relaxation |
| الوصف: |
The oxygen nonstoichiometry of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 - δ (BSCF5582) was investigated by thermogravimetry resulting in values of 2.40 < (3 - δ) <2.57 for the equilibrium oxygen content in the range 600 ≤ T /°C ≤ 900 and 1E- 4 < p O 2 /bar < 0.4. The oxygen exchange kinetics was studied by electrical conductivity relaxation as a function of temperature in the range 550 ≤ T /°C ≤ 725 with chemical diffusion coefficients 1E- 6 < D chem /cm 2 s -1 < 3E- 5 and surface exchange coefficients 2E- 4 < k chem /cm s -1 < 3E-3. The activation energies of the kinetic parameters amount to E a ( D chem ) = 86 ± 8 kJ mol -1 and E a ( k chem ) = 64 ± 12 kJ mol -1 . Self-diffusion and surface exchange coefficients, as well as ionic conductivities are estimated. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| تدمد: |
0167-2738 |
| العلاقة: |
Solid State Ionics--Solid State Ionics--journals:2672--0167-2738; empa:2148; journal id: journals:2672; ut: 000259269100063; local: 13303; scopus: 2-s2.0-48349130799 |
| DOI: |
10.1016/j.ssi.2008.01.089 |
| الإتاحة: |
https://doi.org/10.1016/j.ssi.2008.01.089Test |
| رقم الانضمام: |
edsbas.5541BE05 |
| قاعدة البيانات: |
BASE |
