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EPR and Optical Absorption of Cr 3+ in CsCl and CsBr
Author(s) -
Elbers G.,
Remme S.,
Lehmann G.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221420205
Subject(s) - tetragonal crystal system , electron paramagnetic resonance , monoclinic crystal system , orthorhombic crystal system , crystallography , chemistry , absorption spectroscopy , ion , absorption (acoustics) , spectral line , aqueous solution , materials science , nuclear magnetic resonance , crystal structure , physics , optics , organic chemistry , astronomy , composite material
Abstract EPR spectra of Cr 3+ in CsCl and CsBr single crystals grown from aqueous solutions are studied at 293 and 20 K. In both cases two tetragonal centers with zero‐field splittings in ratios near 2:1 and several centers of orthorhombic and monoclinic site symmetries, respectively, are found. Their relative concentrations vary with growth conditions in CsCl. The structures of these centers can be understood assuming incorporation on interstitial sites similar to those for divalent transition‐metal ions. Application of the superposition model suggests coordination by mixed ligands, the tetragonal centers most likely are [CrX 4/2 H 2 OY] complexes with X = Cl or Br and Y = H 2 O or OH − and Cl − or Br − , respectively. Analysis of the optical absorption spectra also supports these models.