Abstract
63Cu MAS NMR spectra of CuX crystals (X=Cl, Br, and I) and CuX-based glasses (X=Cl, Br, and I) have been measured. The CuCl and CuI crystals gave the isotropic chemical shift values around 0 ppm, and the CuBr crystal, around −55 ppm. The peak positions of the chlorocuprate(I), bromocuprate(I), and iodocuprate(I) glasses were very close to those of the CuX crystals, respectively. This result indicates that these glasses mainly consist of CuX 4 tetrahedra (X=Cl, Br, and I). The halogen coordination environments around Cu + in bromochlorocuprate(I) glasses were dependent on the kind of modifying cation and the Br −/(Cl −+Br −) ratio. The bromochlorocuprate(I) glasses were mainly composed of CuCl m Br 4− m or CuCl n Br 4− n tetrahedra ( m=0, 1, 2, and 4; n=0, 1, and 4).
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