¹¹³Cd magic angle spinning NMR study of crystalline CdF₂, KCdF₃ and CdCl₂ and vitreous CdX₂-NaX-BaX₂ (X = F and/or Cl)

¹¹³Cd magic-angle spinning (MAS) NMR spectra of crystalline CdF₂, KCdF₃ and CdCl₂ and vitreous 50CdF₂·30NaF·20BaF₂, 50CdF₂·30NaCl·(20-x)BaF₂·xBaCl₂ (x = 0, 5, 10, 15 and 20) and 50CdCl₂·15NaCl·35BaCl₂ in mol% were measured so as to reveal the anion coordination environments around Cd²⁺ in the glasses. The CdF₂, KCdF₃ and CdCl₂ crystals gave the isotropic chemical shifts of about -226, -105 and 183 ppm, which are assigned to the CdF₈, CdF₆ and CdCl₆ polyhedra, respectively. The ¹¹³Cd MAS NMR spectrum of 50CdF₂·30NaF·20BaF₂ glass enabled us to estimate quantitatively the fractions of CdF₆, CdF₇ and CdF₈ polyhedra. The ¹¹³Cd MAS NMR spectra revealed that the 50CdCl₂·15NaCl·35BaCl₂ glass consists of CdCl₆ octahedra and that the 50CdF₂·30NaCl·(20-x)BaF₂·xBaCl₂ glasses consist of CdF_6-pCl_p, CdF_7-qCl_q and CdF₈ polyhedra (p = 0-6 and q = 0-5). The peak position and full-width-at-half-maximum values in the 50CdF₂·30NaCl·(20-x)BaF₂·xBaCl₂ glasses increased as BaF₂ was substituted for BaCl₂. This implies that the substitution of BaCl₂ for BaF₂ results in an increase in the number of Cl^- bonded to Cd²⁺ and the occurrence of various anion-coordination environments around Cd²⁺.