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Article Dans Une Revue Chemical Physics Letters Année : 2019

In-situ study of cationic oxidation states in Pr2NiO4+δ using X-ray absorption near-edge spectroscopy

Résumé

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.
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Dates et versions

hal-02123100 , version 1 (21-06-2019)

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Tiphaine Ogier, Carmelo Prestipino, Santiago Figueroa, Fabrice Mauvy, Julie Mougin, et al.. In-situ study of cationic oxidation states in Pr2NiO4+δ using X-ray absorption near-edge spectroscopy. Chemical Physics Letters, 2019, 727, pp.116-120. ⟨10.1016/j.cplett.2019.04.034⟩. ⟨hal-02123100⟩
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