X-ray emission and photoelectron spectra, and the location of fluorine atoms in strontium and calcium copper oxyfluorides

Abstract

X-ray emission and photoelectron spectra of , and cuprates are presented. It is found that the XPS F 1s binding energies of and are different and those of and have intermediate values. These differences in x-ray photoelectron spectra are attributed to the different preferential location of fluorine atoms in structures related to and . The results obtained are in accordance with measurements of F x-ray emission spectra of the same compounds.

Superconducting Sr2−xAxCuO2F2+δ(A=Ca, Ba): Synthetic Pathways and Associated Structural Rearrangements

“…The different location of fluorine in Sr CuO F >B and Ca CuO F >B has been confirmed by measurements of X-ray emission and photoelectron valence band spectra (20). …”

Review on Synthesis, Characterization, and Electrochemical Properties of Fluorinated Nickel‐Cobalt‐Manganese Cathode Active Materials for Lithium‐Ion Batteries

“…The (non)‐fluorinated CAMs (LiM x O y and LiM x O y F z ; M=Ni, Co, and/or Mn) were compared with comparable systems like (non)‐fluorinated metal oxide compounds, i. e. (non)‐fluorinated super con ductors (M x O y and M x O y F z ) . For example, YBa 2 Cu 3 O x F y Cl z (Cl≥0), PbY 1‐ x Ca x Ba 2 Cu 3 O 7 F 2 , Sr 2 CuO 2 F x , CaCuO 2 F x , Sr 2‐ x A x CuO 2 F 2+δ (A=Ca, 0≤ x ≤2.0; A=Ba, 0≤ x ≤0.6), Sr 3 Ru 2 O 7 F 2 , LaSrMnO 4 F, and La 1.2 Sr 1.8 Mn 2 O 7 F . Typical F‐sources for their preparation were ClF 3 , F 2 , [NH 4 ]F, [NH 4 ]FHF, NF 3 , CuF 2 , ZnF 2 , AgF 2 , and NiF 2 .…”

Ab initioperiodic approach to electronic structure and magnetic exchange inA2CuO2X2Moreira1, Dovesi2 2003Phys. Rev. B10010View full textAdd to dashboardCite

“…In the case of oxyfluorides, there are only few experimental studies, mainly addressed to structural and synthetic aspects. [15][16][17][18][19][20] However, the close similarity between the structures and the nature of the ions of this family of compounds is usually invoqued as an argument to suppose that the electronic structures and, hence, electronic and magnetic properties of the oxyfluoride systems are similar to those of the most studied oxychlorides.…”

“…The family of oxyhalide compounds with formula A 2 CuO 2 X 2 (AϭCa ,Sr and XϭF ,Cl) [8][9][10][11][12][13][14][15][16][17][18][19][20] belongs to this class of simple cuprates which have also a smooth variation in their structural and chemical properties. This family is an optimal candidate to a theoretical research because its constituent ions are chemically simple ͑not trivalent lanthanides͒, have different structures without apical oxygens and have quite different superconducting behavior.…”