Tailoring oxygen content on PrBaCo2O5+δ layered cobaltites

被引：138

作者：

Frontera, C ^{[2
]}

Caneiro, A

Carrillo, AE

Oró-Solé, J

García-Muñoz, JL

机构：

[1] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

来源：

CHEMISTRY OF MATERIALS | 2005年 / 17卷 / 22期

关键词：

D O I：

10.1021/cm051148q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The LnBaCo(2)O(5+delta) cobaltites with ordered A-site cations exhibit a very rich phase diagram as a function of the oxygen content, which determines the doping of CoO2 planes. By means of thermogravimetry analysis (TGA), we study the appropriate way to tailor oxygen contents in PrBaCo2O5+delta compounds. Starting from an air-synthesized sample, we study the evolution of delta during different heat treatments with "in situ" TGA measurements. We find that delta can be tailored from delta similar or equal to 0.2 to delta = 0.9. Thermogravimetry measurements also show that oxygen ions can flow through (0 0 1) PrO delta planes at relatively low temperatures (200 degrees C, this temperature increases in compounds with smaller rare earths). By means of neutron powder diffraction at room temperature, we determine the structural details and study the eventual order of oxygen vacancies for different values of delta.

引用

页码：5439 / 5445

页数：7

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