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'Ligand Field Spectra' in keywords Facet   Publication Year 1976  [X]
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1976[X]
1Author    C. Friebel, V. Propach, D. ReinenRequires cookie*
 Title    in Mischkristallen BaXu^Zn^yFg Cu 2+ in Tetragonally Compressed Octahedral Coordination - Spectroscopic Investigations of Mixed Crystals Ba2Cii^.Zn1_xF6  
 Abstract    Usually the Jahn-Teller effect of Cu 2+ in a regular octahedral host lattice site leads to a tetragonal elongation with a small o-rhombic component. If the relevant crystallographic site is slightly tetragonally compressed however in the host lattice structure already — as in Ba 2 ZnF6 -the Jahn-Teller effect may stabilize this distortion symmetry as well. This can be deduced from the EPR-spectroscopic g M -values of 1.99 for the mixed crystals Ba^Zni.^Cu^Fg up to x = 0.3. The angular overlap parameters obtained from the ligand field spectra suggest in addition, that the tetragonal compression of the CuFß polyliedra is considerable, with CuF distances of about 1.90 A (2x) and 2.14 A (4x), respectively. Increasing cooperative elastic interactions between the CuFß polyhedia in the (001) planes at larger Cu 2+ -concentrations induce tetragonally elongated octahedra (with a small o-rhombic component) in antiferrodistortive order at x > 0.6. This cooperative Jahn-Teller order, which is characteristic for Ba2CuF6, can be verified simply by acentric displacements of the F~-ligands connecting two Cu 2+ -ions in the (001) planes. 
  Reference    (Z. Naturforsch. 31b, 1574—1584 [1976]; eingegangen am 13. August 1976) 
  Published    1976 
  Keywords    Jahn-Teller Effect, EPR Spectra, Ligand Field Spectra, Copper 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1574.pdf 
 Identifier    ZNB-1976-31b-1574 
 Volume    31