Abstract
The effect of isotopes (10B–11B; 12C–13C) on the infrared- and Raman-active phonons of boron carbide has been investigated. For Bisotopes, the contributions of the virtual crystal approximation, polarization vector andisotopical disorder are separated. Boron and carbon isotope effects are largely opposite toone another and indicate the share of the particular atoms in the atomic assembliesvibrating in specific phonon modes. Some infrared-active phonons behave as expected formonatomic boron crystals.
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