TY - JOUR
T1 - Determination of valence state of Mn ions in Pr 1-xA xMnO 3-δ (A = Ca, Sr) by Mn-L 3 X-ray absorption near-edge structure analysis
AU - Kanamori, Haruto
AU - Yoshioka, Tsuyoshi
AU - Hirose, Kazuyuki
AU - Yamamoto, Tomoyuki
PY - 2012/8/1
Y1 - 2012/8/1
N2 - The valence states of the Mn ions in Pr 1-xA xMnO 3-δ (A = Ca, Sr) are investigated by Mn-L 3 X-ray absorption near-edge structure (XANES) analysis. The spectral fine structures in the Mn-L 3 XANES analysis show a significant difference between Pr 0.5Ca 0.5MnO 3-δ and Pr 0.5Sr 0.5MnO 3-δ, a paramagnetic insulator and a ferromagnetic metal, respectively, at room temperature, whereas the spectral structures of Pr 0.7Ca 0.3MnO 3-δ and Pr 0.7Sr 0.3MnO 3-δ, paramagnetic insulators, are almost identical. These results indicate that the valence states of the Mn ions in these materials are highly correlated with their magnetic and electrical properties. A significant difference was also found between the Mn-L 3 XANES profiles of Pr 1-xCa xMnO 3-δ and the profiles formed by the linear combination of the Mn-L 3 XANES spectra of PrMnO 3 (Mn 3+) and CaMnO 3 (Mn 4+). This difference indicates that the Mn ions in these materials do not have a mixed-valence state of 3+ and 4+, but have an intermediate valence state o 3+ and 4+.
AB - The valence states of the Mn ions in Pr 1-xA xMnO 3-δ (A = Ca, Sr) are investigated by Mn-L 3 X-ray absorption near-edge structure (XANES) analysis. The spectral fine structures in the Mn-L 3 XANES analysis show a significant difference between Pr 0.5Ca 0.5MnO 3-δ and Pr 0.5Sr 0.5MnO 3-δ, a paramagnetic insulator and a ferromagnetic metal, respectively, at room temperature, whereas the spectral structures of Pr 0.7Ca 0.3MnO 3-δ and Pr 0.7Sr 0.3MnO 3-δ, paramagnetic insulators, are almost identical. These results indicate that the valence states of the Mn ions in these materials are highly correlated with their magnetic and electrical properties. A significant difference was also found between the Mn-L 3 XANES profiles of Pr 1-xCa xMnO 3-δ and the profiles formed by the linear combination of the Mn-L 3 XANES spectra of PrMnO 3 (Mn 3+) and CaMnO 3 (Mn 4+). This difference indicates that the Mn ions in these materials do not have a mixed-valence state of 3+ and 4+, but have an intermediate valence state o 3+ and 4+.
KW - Electrical conductivity
KW - Magnetic property
KW - Perovskite manganite
KW - Valence state
KW - X-ray absorption spectrum
UR - http://www.scopus.com/inward/record.url?scp=84863708214&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863708214&partnerID=8YFLogxK
U2 - 10.1016/j.elspec.2012.03.003
DO - 10.1016/j.elspec.2012.03.003
M3 - Article
AN - SCOPUS:84863708214
SN - 0368-2048
VL - 185
SP - 129
EP - 132
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
IS - 5-7
ER -