NMR evidence for five- and six-coordinated aluminum fluoride complexes in F-bearing aluminosilicate glasses Available to Purchase

Anhydrous glasses of jadeite + NaF and jadeite + cryolite compositions were quenched from melts at 1250 °C and 3.0–3.5 kbar. ¹⁹F to ²⁷Al cross-polarization MAS-NMR experiments at a magnetic field of 8.45 T and single pulse ²⁷Al MAS-NMR experiments at 14.1 T demonstrated the presence of ^[4]Al, ^[5]Al, and ^[6]Al in both glasses. The ^[5]Al is thought to be present in AlF²⁻₅ complexes, a previously unknown species.