X-ray spectra and valence states of cations in nanostructured half-doped \(\hbox {La}_{0.5}\hbox {Ca}_{0.5}\hbox {MnO}_{3}\) manganite

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• 作者：V. R. Galakhov (1)
  V. V. Mesilov (1)
  S. N. Shamin (1)
  B. A. Gizhevskii (1)
  N. A. Skorikov (1)
  S. V. Naumov (1)
  O. Yu. Vilkov (2)
  
  1. Institute of Metal Physics ; Ural Branch of the Russian Academy of Sciences ; 620990 ; Yekaterinburg ; Russia
  2. Fock Research Institute for Physics ; St. Petersburg State University ; Saint Petersburg ; Russia
  
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：118
• 期：2
• 页码：649-654
• 全文大小：646 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

Soft X-ray absorption (XAS) and emission (XES) spectroscopies were applied to determine valence states of manganese ions in nanostructured powder of half-doped \(\hbox {La}_{0.5}\hbox {Ca}_{0.5}\hbox {MnO}_{3}\) manganite obtained by milling in a ball mill. XAS spectra were measured both in surface-sensitivity total electron-yield and in bulk-sensitivity total fluorescence-yield modes. O K \(_{\upalpha }\) XES and O 1s XAS spectra characterized the occupied and unoccupied partial O 2p densities of states are compared with band-structure calculations made using the TB-LMTO-ASA codes. Experimental Mn 2p, Ca 2p, and La 3 \(d\) XAS spectra are compared with results of crystal field atomic multiplet calculations. For the nanostructured system of \(\hbox {La}_{0.5}\hbox {Ca}_{0.5}\hbox {MnO}_{3}\) , concentrations of Mn \(^{4+}\) ions are found to be increased with increasing the time of milling.