Solid state magic angle spinning 31 P nuclear magnetic resonance (MAS NMR) spectroscopy was performed to investigate changes in the phosphate tetrahedra in the new blend materials, given the relatively high sensitivity of the spin ½ 31 P nuclei. Direct NMR and 31 P{ 1 H} cross polarisation (CP) NMR measurements (Figure ) were carried out to analyse the effect of adding agZIF-62 to the phosphate glass.