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In-situ study of cationic oxidation states in Pr2NiO4+δ using X-ray absorption near-edge spectroscopy
- Source :
- Chemical Physics Letters, Chemical Physics Letters, 2019, 727, pp.116-120. ⟨10.1016/j.cplett.2019.04.034⟩, Chemical Physics Letters, Elsevier, 2019, 727, pp.116-120. ⟨10.1016/j.cplett.2019.04.034⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; The mean oxidation state of cationic elements in Pr2NiO4+δ was studied using XANES measurements versus temperature in air. Unexpectedly, praseodymium is solely found as Pr3+ while Pr4+ was also foreseeable. Pr3+ cation is well accommodated in the large rare-earth site with the nine-fold coordination in this K2NiF4 – T-type structure; conversely, the small size of the Pr4+ cation seems not compatible with this site. Moreover, XANES measurements show a progressive decrease of the mean oxidation state of nickel ions when the temperature increases. It is directly correlated to the decrease of the oxygen over-stoichiometry of the material evidenced by TGA measurements.
- Subjects :
- Materials science
Praseodymium
Analytical chemistry
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
010402 general chemistry
Pr L III -edge
01 natural sciences
Oxygen
Oxidation state
K 2 NiF 4 -T-type structure
SOFC
Physical and Theoretical Chemistry
Spectroscopy
praseodymium nickelate
X-ray
Cationic polymerization
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
XANES
Ni K-edge
0104 chemical sciences
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
oxidation states
chemistry
Absorption (chemistry)
SOEC
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 00092614
- Database :
- OpenAIRE
- Journal :
- Chemical Physics Letters, Chemical Physics Letters, 2019, 727, pp.116-120. ⟨10.1016/j.cplett.2019.04.034⟩, Chemical Physics Letters, Elsevier, 2019, 727, pp.116-120. ⟨10.1016/j.cplett.2019.04.034⟩
- Accession number :
- edsair.doi.dedup.....c8e6704e17a15fcb5157a9f6dc8ffb22