Abstract
For some boron-rich solids, in particular boron carbide, it is proved that FT-Raman spectroscopy yields reliable spectra of the Raman-active phonons, while the conventional Raman spectra are strongly influenced by the surface properties of the samples, and hence they are less suitable to detect the bulk properties of these solids. The FT-Raman spectra of 10B, 11B, and 13C isotope-enriched boron carbide of compositions B 4.3C, B 6.5C, and B 10C have been measured in completion to the recently published IR-Phonon spectra of the same samples. Considering the description of movement of atoms in specific Raman-active modes determined by Shirai and Emura, the spectra are evaluated and discussed with respect to the composition-dependent concentrations of structural elements like B 12 and B 11C icosahedra, CBC, CBB, and CCC chains within the homogeneity range. Most of the Raman bands can be attributed to specific lattice vibrations.
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