Abstract
The temperature dependence of nuclear relaxation rate, 1/ T 1 has been measured for copper halides, CuX with X being Cl, Br and I. The results are interpreted in terms of the quadrupole relaxation due to lattice vibrations and defect motions. The data of 1/ T 1 are compared with a model calculation based on an ionic model, in which the degree of covalent bonding λ 0 is estimated to be 63% for CuCl, 49% for CuBr and 27% for CuI. The λ 0 values for copper halides are compared with previous values for silver and sodium halides, and also compared with the ionicity of A N B 8- N binary compounds. The relation between λ 0 values and migration energies E m for cation vacancies derived from 1/ T 1 data is discussed in connection with the superionicity of α-AgI.
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