113Cd magic-angle spinning nuclear magnetic resonance spectra of crystalline CdF2, KCdF3 and CdCl2 with known crystal structures and vitreous 50CdF2 · 30NaCl · (20 - x)BaF2 · xBaCl2 in mol% (x : 0, 5, 10, 15 and 20) were measured to reveal the anion-coordination environments around Cd2+ in the glasses. The isotropic chemical shifts, δiso, of the CdF2, KCdF3 and CdCl2 crystals locate around -226, -105 and 183 ppm, being assigned to the CdF8, CdF6 and CdCl6 polyhedra, respectively. From an analysis of the 113Cd magic-angle spinning nuclear magnetic resonance spectra of the glasses we deduced that CdFmCln polyhedra (m ≠ 0 and n ≠ 0) which have not been found in crystalline compounds are present in the glasses. The peak positions and the full widths at half maxima (FWHM) in the glasses increased as BaF2 was replaced by BaCl2. This increase implies that the number of Cl- bonded to Cd2+ increases with increasing BaCl2-content and also that a variety of anion-coordination environments around Cd2+ are more distributed with increasing BaCl2-content.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry