ISSN:
0377-0486
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Raman and resonance Raman spectra (100-1000 cm-1) of ZrS3, several Zr1-xTixS3 ternary compounds (0〈x≤0.33) and TiS3 single crystals have been obtained using a micro-Mole Raman instrument. For ZrS3, when using the 514.5 nm exciting line, the αyy and αxx polarizability components give rise to different resonance Raman spectra, demonstrating definitely that two distinct allowed excitonic transitions are contained in the lowest energy absorption band at ca 500.0 nm. In the ternary phase Zr1-xTixS3, the mode behaviour of long-wavelength optical phonons were investigated through the composition range 0〈x≤0.33: a mixed one-, two- and three-mode behaviour was observed, depending on the nature of the vibrations; in particular, the three-mode behaviour of the diatomic v(S—S)2- mode can be well accounted for in terms of S22- pairs surrounded by either Zr4+, Ti4+ or Zr4+ and Ti4+ ions and the relative intensities of the three components are in agreement with a statistical distribution of titanium within the ZrS3 type structure. Finally, new polarized Raman spectra of TiS3 have been obtained and band wavenumbers of the Raman active phonons in these compounds compared.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/jrs.1250170310
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