Physics Journal
Articles Information
Physics Journal, Vol.1, No.3, Nov. 2015, Pub. Date: Sep. 18, 2015
Chemical Shift Studies of 3d Elements Mn, Cr and Cu K-edges by X-ray Absorption Spectroscopy (XAS) with INDUS-2 Synchrotron Radiation at RRCAT, Indore, India
Pages: 200-203 Views: 2299 Downloads: 1101
Authors
[01] Daisy Joseph, Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, India.
Abstract
Mn, Cr and Cu K X-ray absorption edges were measured in various compounds containing Mn in Mn2+, Mn3+ and Mn4+ oxidation states, Cr in Cr3+ and Cr6+ oxidation state and Cu in 2+ states in different compounds. Few compounds are having tetrahedral coordination in the 1st shell surrounding the cation while others are having octahedral coordination. The measurements have been carried out at the energy dispersive EXAFS beamline at INDUS-2 Synchrotron radiation source at RRCAT, Indore. Energy shifts of ~ 8-16 eV were observed for Mn K edge in the Mn-compounds while a shift of 13-20 eV were observed for Cr K edge in Cr-compounds compared to their values in elemental Mn and Cr respectively. Cu showed an energy shift of 4-7 ev compared to the elemental Cu. The different chemical shifts observed for the compounds having the same oxidation state of the cation but different anions or ligands show the effect of different chemical environments surrounding the cations in determining their X-ray absorption edges in the above compounds. The above chemical effect has been quantitatively described by determining the effective charges on Mn, Cr and Cu cations in the above compounds.
Keywords
INDUS, XAS, X-ray Absorption Edges, Oxidation State, Cation, Energy Shift
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