期刊
MATERIALS
卷 13, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/ma13184044
关键词
positrode; cobaltites; synchrotron powder diffraction; X-ray absorption spectroscopy; ceramics; thermal expansion; chemical expansion
类别
资金
- National Science Centre Poland [2016/22/Z/ST5/00691]
- Spanish Ministry of Science and Innovation [PCIN-2017-125, RTI2018-102161, IJCI-2017-34110]
- Research Council of Norway through the M-ERA.NET Joint Call 2016 [272797 GoPHy MiCO]
The application of double perovskite cobaltites BaLnCo(2)O(6-delta) (Ln = lanthanide element) in electrochemical devices for energy conversion requires control of their properties at operating conditions. This work presents a study of a series of BaLnCo(2)O(6-delta) (Ln = La, Pr, Nd) with a focus on the evolution of structural and electrical properties with temperature. Symmetry, oxygen non-stoichiometry, and cobalt valence state have been examined by means of Synchrotron Radiation Powder X-ray Diffraction (SR-PXD), thermogravimetry (TG), and X-ray Absorption Spectroscopy (XAS). The results indicate that all three compositions maintain mainly orthorhombic structure from RT to 1000 degrees C. Chemical expansion from Co reduction and formation of oxygen vacancies is observed and characterized above 350 degrees C. Following XAS experiments, the high spin of Co was ascertained in the whole range of temperatures for BLC, BPC, and BNC.
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