TY - JOUR
T1 - Evaluation of electrical conductivity and oxygen diffusivity of the typical Ruddlesden-Popper oxide Sr3Fe2O7-δ
AU - Ling, Yihan
AU - Guo, Tianmin
AU - Zhang, Xiaozhen
AU - Budiman, Riyan Achmad
AU - Fujimaki, Yoshinobu
AU - Nakamura, Takashi
AU - Lin, Bin
AU - Kawada, Tatsuya
AU - Amezawa, Koji
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (No. 51602343 ), the Natural Science Foundation of Jiangsu Province (No. BK20160271 ), China Postdoctoral Science Foundation (Grant no. 2016M600449 ), and Japan Society for the Promotion of Science (JSPS) through a Post-doctoral Fellowship for Foreign Researchers.
Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
PY - 2017/12/15
Y1 - 2017/12/15
N2 - The electrical conductivity (σ) and oxygen diffusivity of the typical Ruddlesden-Popper oxide Sr3Fe2O7-δ were investigated with the variation of oxygen partial pressure, P(O2), and temperatures, and thus the results were discussed based on its defect structure. The σ increases with the increase of P(O2) and a positive slope of log σ depend on P(O2) is close to 1/4 with the small polaron conduction, where the mobility μP are between 0.01 and 0.02 cm2 V−1 s−1 regardless of temperature and P(O2). Oxygen diffusivity derived from the electrical conductivity relaxation (ECR) after an abrupt change of P(O2) increased with the increase P(O2) and temperature. A new pulse isotope 18O-16O exchange (PIE) at 623–773 K was carried in order to rapidly determine the tracer oxygen surface reaction coefficient. The numerical relationship of oxygen diffusivity measured by ECR and PIE measurements was successfully established by the ambipolar diffusion theory and defect chemical analysis.
AB - The electrical conductivity (σ) and oxygen diffusivity of the typical Ruddlesden-Popper oxide Sr3Fe2O7-δ were investigated with the variation of oxygen partial pressure, P(O2), and temperatures, and thus the results were discussed based on its defect structure. The σ increases with the increase of P(O2) and a positive slope of log σ depend on P(O2) is close to 1/4 with the small polaron conduction, where the mobility μP are between 0.01 and 0.02 cm2 V−1 s−1 regardless of temperature and P(O2). Oxygen diffusivity derived from the electrical conductivity relaxation (ECR) after an abrupt change of P(O2) increased with the increase P(O2) and temperature. A new pulse isotope 18O-16O exchange (PIE) at 623–773 K was carried in order to rapidly determine the tracer oxygen surface reaction coefficient. The numerical relationship of oxygen diffusivity measured by ECR and PIE measurements was successfully established by the ambipolar diffusion theory and defect chemical analysis.
KW - Electrical conductivity
KW - Electrical conductivity relaxation
KW - Oxygen diffusivity
KW - Pulse isotope O-O exchange
KW - Ruddlesden–Popper oxide
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U2 - 10.1016/j.ceramint.2017.08.211
DO - 10.1016/j.ceramint.2017.08.211
M3 - Article
AN - SCOPUS:85028829725
SN - 0272-8842
VL - 43
SP - 16264
EP - 16269
JO - Ceramics International
JF - Ceramics International
IS - 18
ER -