USE OF THE « BREMSSPECTRUM » FOR PHONON SPECTROSCOPY ON Al2O3 : V3+ AND FOR A STUDY OF THE PHONON PROPAGATION IN GRANULAR ALUMINIUM H. KINDERJ. Phys. Colloques, 33 C4 (1972) C4-21-C4-23DOI: https://doi.org/10.1051/jphyscol:1972405