Abstract
We have studied the effect of aluminum doping and boron isotopic substitution on the Raman spectra of the Mg1−xAlx10,11B2 polycrystalline compounds. Our data show that new peaks appear at ∼740 and 870cm−1 while the broad band at ∼600cm−1 diminishes for higher Al doping levels. The high energy band evolves to the E2g phonon mode of AlB2 corresponding to a strong reduction in the electron–phonon coupling. The isotopic shift for the broad band at ∼600cm−1 is small considering the isotopic shift of the other bands, which follow the harmonic mass law. This extreme anharmonic behavior indicates that the broad band may not be directly related with the E2g phonon of the B atoms.
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