| | 1 | Author
| Erwin Riedel, Norbert Pfeil | Requires cookie* | | | Title
| Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, II Röntgenographische Untersuchung, Seebeck Koeffizienten, Mößbauer-und IR-Spektren der Mischkristallreihen Fe2V04-ZnV204 und Fe2V04-ZnFe204 Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, II X-ray Investigation, Seebeck Coefficients, Mössbauer and IR Spectra of the Solid Solutions Fe2V04-ZnV204 and Fe2V04-ZnFe204  | | | | Abstract
| The spinel series Fe2V04-ZnV204 and Fe2V04-ZnFe204 have been prepared and investigated. The lattice constants and Mössbauer spectra lead to a distribution of cations which proves that Fe2V04 is a partially inverse spinel with Fe(II) and Fe(III) on the tetrahedral site. The Seebeck effect is interpreted with a model of both tetrahedral and octahedral conduction based on charge hopping. | | | |
Reference
| Z. Naturforsch. 35b, 1261—1267 (1980); eingegangen am 2. Juni 1980 | | | |
Published
| 1980 | | | |
Keywords
| Zinc-Iron-Vanadium Spineis, Mössbauer Spectroscopy, Seebeck Effect, Charge Hopping, Cation Distribution | | | |
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| default:Reihe_B/35/ZNB-1980-35b-1261.pdf | | | | Identifier
| ZNB-1980-35b-1261 | | | | Volume
| 35 | |
| 2 | Author
| Erwin Riedel, Jörg Kahler, N. Orbert Pfeil | Requires cookie* | | | Title
| Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, VIII Gitterkonstanten, Mößbauer-Spektren und elektronische Eigenschaften der Mischkristallreihe FeV20 4—Fe30 4 Distribution and Valence of the Cations in Spinel Systems with Iron and V anadium , VIII Lattice Constants, M össbauer Spectra and Electronic Properties of the Solid Solution FeV20 4—Fe30 4 | | | | Abstract
| From lattice constants and M össbauer data the valence distribution and an energy-level diagram o f the spinel system F e(F evV 2_t) 0 4 have been derived. In the range 0.3 < x ^ 1.5 the transition from normal to inverse spinels takes place. The M ößbauer spectra with 1.0 < jc ^ 2.0 consist o f two sets o f sextets corresponding to tetrahedral and octahedral sites. Typical values o f isom er shift and internal m agnetic field strength due to the different environments o f the iron ion result from the superim posed sextets o f the octahedral site pattern. Neighbouring V ions enhance the conduc tion electron density and diminish the strength o f the magnetic interaction. M ößbauer data, Seebeck coefficients and activation energies lead to a m odel of both tetrahedral and octahedral conduction based on charge hopping. For F e1.gV 1. | 0 4 there exists only one iron species. | | | |
Reference
| Z. Naturforsch. 44b, 1427 (1989); eingegangen am 20. Juni 1989 | | | |
Published
| 1989 | | | |
Keywords
| Iron-Vanadium Spineis, M össbauer Spectra, V alence Distribution, Charge H opping, Seebeck Effect | | | |
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| default:Reihe_B/44/ZNB-1989-44b-1427.pdf | | | | Identifier
| ZNB-1989-44b-1427 | | | | Volume
| 44 | |
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