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The  81 Br nuclear spin-lattice relaxation time in AlBr 3  has been measured between 8 K and room temperature. The result is analyzed using the theory of the Raman process based on covalency. A Debye temperature of 67.6 K and covalency of 0.070 and 0.072 for terminal and 0.022 for bridging bonds are obtained. The correspondence of the latter values to those obtained from the NQR frequencies is low, in contrast to the previously examined compounds.

81 Br Nuclear Quadrupole Relaxation in Aluminium Tribromide