Related Experiment Video
Updated: Jun 3, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Local structural disorder in REFeAsO oxypnictides by RE L(3) edge XANES
1BSRF, Institute of High Energy Physics, Chinese Academy of Sciences, 10049, Beijing, People's Republic of China.
Abstract:
The REFeAsO (RE = La, Pr, Nd and Sm) system has been studied by RE L(3) x-ray absorption near edge structure (XANES) spectroscopy to explore the contribution of the REO spacers between the electronically active FeAs slabs in these materials. The XANES spectra have been simulated by full multiple scattering calculations to describe the different experimental features and their evolution with the RE size. The near edge feature just above the L(3) white line is found to be sensitive to the ordering/disordering of oxygen atoms in the REO layers. In addition, shape resonance peaks due to As and O scattering change systematically, indicating local structural changes in the FeAs slabs and the REO spacers due to RE size. The results suggest that interlayer coupling and oxygen order/disorder in the REO spacers may have an important role in the superconductivity and itinerant magnetism of the oxypnictides.
Related Concept Videos
Drugs Affecting Neurotransmitter Release or Uptake
Imperfections in Crystal Structure: Non-Stoichiometric Defects
Imperfections in Crystal Structure: Stoichiometric Point Defects
Tetanus
Toxidromes: Clinical Features
Imperfections in Crystal Structure: Point, Line and Plane Defects

