The structural properties of multilayers consisting of Fe layers separated by Si or FeSi layers grown with molecular beam epitaxy on MgO(001) and Si(111) are reported. Rutherford backscattering and ion channeling are used to determine the crystallinity of the layers. We find evidence for epitaxy, alloying effects, and structural coherence. Conversion electron Mössbauer spectroscopy is utilized to investigate the silicide formation in the spacer layer of Fe/FeSi multilayers and at the interface of Fe/Si layers. The silicide formed in Fe/FeSi multilayers is characterized by a broad single line Mössbauer resonance which is characteristic for the metastable CsCl–FeSi phase. For Fe/Si multilayers the Mössbauer results indicate that FeSi compounds with clearly other hyperfine parameters than the CsCl phase are formed in the spacer.
The structure of a 20 Å thin Co layer embedded between Fe layers grown with molecular beam epitaxy on MgO is determined with ion beam channeling. From the position and the ratio of the widths of the angular yield profiles for different crystallographic directions, we show that Co is forced in the metastable body centered cubic structure. The presence of tetragonal distortion in the Co layer is observed.
Mossbauer spectra of FeCh-doped poly(phenyleneviny1ene) with composition [ C~H~( F~C~) O .~O ]~ and of '2912-doped poly(2,5-thienylenevinylene) with composition [C6H4sIO,SO]n showed FeC4-and symmetrical IS-, respectively, to constitute the dopant ions. The above doping processes are in these aspects equal to the doping processes in polyacetylene, while the corresponding processes in polyphenylene (FeCl3 doping) and polythiophene (I2 doping) show a slightly different behavior.
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