X-ray diffraction, Raman, infrared and Mössbauer spectra of heavily Fe doped Bi2Sr2Ca1Cu2O8+d
| Autor: | Pablo Etchegoin, Stella Duhalde, Carlos Fainstein, Néstor E. Massa, Celia Saragovi |
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| Rok vydání: | 1992 |
| Předmět: |
Materials science
Absorption spectroscopy Infrared Analytical chemistry Infrared spectroscopy Ionic bonding Condensed Matter Physics Spectral line Electronic Optical and Magnetic Materials symbols.namesake Nuclear magnetic resonance X-ray crystallography Mössbauer spectroscopy symbols Raman spectroscopy |
| Zdroj: | Ferroelectrics. 128:249-254 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199208015100 |
| Popis: | We report measurements on x-rays diffraction and Raman, infrared and Mossbauer absorption spectra of Bi2Sr2Ca1(Cu1−x, Fex)2O8+δ, 0·05≤x≤0·25. X-ray analysis shows that the increment of Fe in the CuO2 layers results in the growing of the n=1 phase at the expense of the n=2, with possible segregation of Fe at the higher dopant concentration. Mossbauer characterization requires two different configurations for the Fe in the n=2 phase. Only one doublet is assigned to the Fe at the Cu site for n=1. The resulting spin configuration shows an one mode behavior for the 2-magnon Raman response. These low temperature normal state spectra have resonant behavior that help to put in evidence a second weaker band at higher frequencies, assigned to four spin exchanges. Infrared spectra, in agreement with isomer shifts suggesting the presence of Fe3+, yields ionic features expected for an environment with long range interactions in which oxygen ions play a main role. |
| Databáze: | OpenAIRE |
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