| | 1 | Author
| Bernd Grande, Hanskarl Müller-Buschbaum | Requires cookie* | | | Title
| Über Oxocuprate, XIV Zur Kristallchemie von Sr2Cu304Cl2 On Oxocuprate, XIV On the Crystal Chemistry of Sr2Cu304Cl2  | | | | Abstract
| The new compound Sr2Cu304Cl2 was prepared in melts of SrCl2. A single crystal X-ray examination (a = 546.2, c= 1259.1 pm, space group D^-14/mmm) shows that the octahedral distortion of the [Cu304Cl2] 4 ~-network cannot be explained only by the JAHN-TELLER effect. | | | |
Reference
| (Z. Naturforsch. 31b, 405—407 [1976]; eingegangen am 24. November 1975) | | | |
Published
| 1976 | | | |
Keywords
| Strontium, Copper, Oxide Chloride, Crystal Structure, Coordination | | | |
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| default:Reihe_B/31/ZNB-1976-31b-0405.pdf | | | | Identifier
| ZNB-1976-31b-0405 | | | | Volume
| 31 | |
| 2 | Author
| C. Friebel, V. Propach, D. Reinen | Requires 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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| default:Reihe_B/31/ZNB-1976-31b-1574.pdf | | | | Identifier
| ZNB-1976-31b-1574 | | | | Volume
| 31 | |
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