| | 1 | Author
| C. H. Rüscher, M. Zimmermann, M. Götte | Requires cookie* | | | Title
| Investigations of the Anisotropic Optical Reflectivity of Binary and Ternary Nb-W Oxides Possessing Block-Type Crystal Structure  | | | | Abstract
| We have studied the anisotropic optical properties of binary Nb0 2 5 _ a (0 < Ö < 0.083) and ternary Nb 18 _ £ W 8+£ 0 6? (e = 0,1,..., 9) compounds using the polarized regular-reflection method. We observed strong anisotropic behaviour for all reduced phases. The anisotropic effect can be related to the crystallographical structure principle and to the doping of charge carriers by the reduction of oxygen (<5) or substitution of W for Nb (e) in the binary and ternary oxides, respectively. Our results indicate that the charge carriers are confined to the structural block units. For increasing 3 and e, metal-like properties occur (<5 > 0.1, e > 8) in the infinite block direction only. | | | |
Reference
| Z. Naturforsch. 48a, 443—446 (1993); received December 31 1991 | | | |
Published
| 1993 | | | |
Keywords
| Optical reflectivity, Block-type crystal structure, Niobium oxide, Niobium tungsten oxide | | | |
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| default:Reihe_A/48/ZNA-1993-48a-0443.pdf | | | | Identifier
| ZNA-1993-48a-0443 | | | | Volume
| 48 | |
| 2 | Author
| Magdolna Hargittai, Gabor Jancsó | Requires cookie* | | | Title
| Correlation of Crystal Structure and Vapor Composition of Metal Dihalides | | | | Abstract
| The presence of dimers in the vapor of metal dihalides, as seen in electron diffraction experiments, is found to be correlated with the crystal structure of the halide and with the difference in the heat of vaporization between monomers and dimers. If the dimeric molecule cannot be recognized as a unit in the crystal, dimers are not detected in the vapor. If dimeric molecules are discernible in the crystal, they will be observed in the vapor if their heat of vaporization is not greater than that of the monomer by more than 10kcal/mol. | | | |
Reference
| Z. Naturforsch. 48a, 1000—1004 (1993); received July 20 1993 | | | |
Published
| 1993 | | | |
Keywords
| Crystal structure, Vapor composition, Metal dihalides, Correlation of structure and vapor composition, Gas-phase electron diffraction | | | |
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| default:Reihe_A/48/ZNA-1993-48a-1000.pdf | | | | Identifier
| ZNA-1993-48a-1000 | | | | Volume
| 48 | |
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