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Optical and EPR Studies of Redox Interactions of Polyvalent Ions (Cr, Cu) in Glass
Author(s) -
KOBAYASHI KEIJI
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb09375.x
Subject(s) - electron paramagnetic resonance , chromium , redox , chemistry , ion , absorption spectroscopy , octahedron , analytical chemistry (journal) , alkali metal , absorption (acoustics) , copper , spectral line , inorganic chemistry , ligand field theory , crystallography , materials science , nuclear magnetic resonance , physics , organic chemistry , quantum mechanics , chromatography , astronomy , composite material
Chromium centers in isolated Cr ions and Cr(III)‐Cu(II) redox interactions were investigated by optical and EPR spectra. Line shapes and intensities of high‐field Cr(III)‐Cu(II) superimposed EPR absorption lines were sensitive to alkali content of host glasses. High‐field chromium g values (1.94 to 1.99) and intensities (190 to 3600) were calculated. The increase in g values from 1.96 to 1.98 is related to an increase in Cr(V) and to a conversion from Cu(I) to Cu(II) with increased alkali content. Two components of Cr powder spectra near g = 2.0 and g = 5.0 correspond to isolated octahedral Cr centers described by Landry et al. Cr‐Cr pair structure was not observed for low Cr 2 O 3 concentrations. Three components of optical absorption bands near 340 nm, 430 to 460 nm, and 600 nm were measured in Cr(III)‐Cu(II) redox systems. Electronic interactions of Cr(III)‐Cu(II) redox systems and the structure of Cr centers are discussed.