Hong, W.T., Stoerzinger, K.A., Crumlin, E.J., Mutoro, E., Jeen, H., Lee, H.N. and Shao-Horn, Y. (2016) Near-Am- bient Pressure XPS of High-Temperature Surface Chemistry in Sr2Co2O5 Thin Films. Topics in Catalysis, 59, 574-558.
http://dx.doi.org/10.1007/s11244-015-0532-4
被以下文章引用:
-
标题:
SrCoOx薄膜中的氧空位效应研究Study on the Effects of Oxygen Vacancy in SrCoOx Thin Films
作者:
史志界, 江正华, 周浩, 汤如俊
关键字:
SrCoOx, 退火温度, 氧空位SrCoOx, Annealing Temperature, Oxygen Vacancy
期刊名称:
《Applied Physics》, Vol.6 No.10, 2016-10-14
摘要:
本文中我们采用脉冲激光沉积技术在SrTiO3(001)基底上制备出钙铁石结构的SrCoO2.5(BM-SCO)外延薄膜，在氧气氛围、不同温度下对样品进行后退火工艺处理，使薄膜发生由钙铁石相到钙钛矿相(P-SCO)的拓扑相变。研究结果表明薄膜的磁性和微结构在相变温度(250℃)附近发生很大的变化。当退火温度为250℃ ≤ T 3–δ。XPS拟合结果显示，退火后Co的价态发生变化，从Co3+转变为Co4+，即薄膜中的部分氧空位被填充。故退火后钙钛矿型SrCoO3–δ的氧含量(3–δ)约为2.75。
In this work, we grew brownmillerite SrCoO2.5 (BM-SCO) epitaxial thin films on (001) SrTiO3 substrates by pulsed laser deposition and performed post-annealing at various temperatures in oxygen atmosphere for topotactic conversion into the perovskite phase (P-SCO). The results show that the magnetic properties and microstructure of the films have a great change near the critical temperature (250˚C). When a BM-SCO film was annealed in lower temperature (250˚C ≤ T 2.5 to the perovskite SrCoO3–δ was exhibited. XPS fitting results clearly indicate a change in the Co valence state from 3+ toward 4+. So some oxygen vacancies in the films are filled. Therefore, we conclude that the oxygen concentration (3–δ) in perovskite SrCoO3–δ by post-annealing is about 2.75.