Determination of Mn Valence from X-Ray Absorption Near Edge Structure and Study of Magnetic Behavior in Hole-Doped (Nd1−xCax)MnO3System

Liu, R.S.; Wu, J. B.; Chang, Chen-Yu; Lin, J. G.; Huang, Chi‐Feng; Chen, J.M.; Liu, R.G.

doi:10.1006/jssc.1996.0272

Cited by 29 publications

(16 citation statements)

References 5 publications

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“…A similar trend can be seen for the L 2 edge. This chemical shift is in good agreement with reported results on various manganite perovskites [13,14] and other Mn compounds [9]. According to studies of Mn oxide compounds by means of Electron Energy Loss Spectroscopy (EELS) [15] the decreasing energetic distance ΔE L between the maxima of the Mn L 2 and L 3 edges ( Figure 1a and Table 1) due to increasing x Ca corresponds to an increase in Mn valence.…”

Section: Doping Dependence Of Virgin Samplessupporting

confidence: 90%

In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts

et al. 2014

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Studying catalysts in situ is of high interest for understanding their surface structure and electronic states in operation. Herein, we present a study of epitaxial manganite perovskite thin films (Pr 1−x Ca x MnO 3 ) active for the oxygen evolution reaction (OER) from electro-catalytic water splitting. X-ray absorption near-edge spectroscopy (XANES) at the Mn L-and O K-edges, as well as X-ray photoemission spectroscopy (XPS) of the O 1s and Ca 2p states have been performed in ultra-high vacuum and in water vapor under positive applied bias at room temperature. It is shown that under the oxidizing conditions of the OER a reduced Mn 2+ species is generated at the catalyst surface. The Mn valence shift is accompanied by the formation of surface oxygen vacancies. Annealing of the catalysts in O 2 atmosphere at 120 °C restores the virgin surfaces.

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Section: Doping Dependence Of Virgin Samplessupporting

confidence: 90%

In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts

et al. 2014

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“…In addition, as the oxidation state of Mn increases, the Mn¸ absorption edge shifts to higher energy, from &642. corrected with the effective atomic charge on the absorbing atoms (8,12). We have recently been successful in applying this technique to characterize the Mn valence in the (Nd \V Ca V )MnO system (15). As shown, the main peak position of the Mn¸-edge in LiMn O , as marked by arrows, is close to that in MnO with Mn> in octahedral symmetry.…”

Section: Resultsmentioning

confidence: 91%

X-ray Absorption Studies in Spinel-Type LiMn2O4

Liu

Jang

Chen

et al. 1997

Journal of Solid State Chemistry

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“…Since the distortions of Mn octahedra are similar in both RP compounds, we assume that the XANES spectra are determined mostly by the density of unoccupied Mn 3d states. It is also worth noting that the mea- as Mn(III) and Mn(IV) references, respectively, show slightly different shape from those obtained in theoretical calculations [12] and previous experiments [13][14][15]. Despite the fact that the spectra presented in ref.…”

mentioning

confidence: 44%