The Cu+ diffusion mechanism was studied by means of nuclear magnetic resonance, powder X-ray diffraction and alternating-current conductivity measurements. The satellite spectra of the 63Cu and 27Al nuclear magnetic resonance varied anomalously with temperature. The quadrupole coupling constant of the 63Cu nucleus and the asymmetrical parameter of the 27Al nucleus changed markedly with decreasing temperature, while the quadrupole coupling constant of the 27Al nucleus did not change as much. By calculating the electric-field gradient tensors, it was confirmed that these temperature dependences were produced by both Cu+ diffusion and by variations in the lattice constants. The diffusion path of Cu+ was confirmed, by nuclear magnetic resonance data, to be such that Cu+ jumped between normal sites via an interstitial site. The ionic conductivity was evaluated by assuming that the diffusion mechanism and its value were consistent with the observed alternating-current conductivity.

Diffusion Mechanism of Copper (I) ion in CuAlBr4 Studied by Nuclear Magnetic Resonance. Y.Tomita, K.Kobayashi, H.Ohki, K.Yamada, T.Okuda: Solid State Ionics, 1999, 126[1-2], 121-31

Table 14

Diffusivity of 64Cu in CuBr