Structural investigation of fluorophosphate glasses by 19F, 31P MAS-NMR and IR spectroscopy

• Fluorophosphate glasses have been synthesized in the NaPO3–ZnF2–MnF2 system.
• IR spectra have been recorded between 400 and 4000 cm− 1.
• 19F MAS and 31P MAS NMR measurements have been performed.
• Glass structure is described as a hybrid network of MX6 octahedra and PX4 (X = O, F) tetrahedra.

A series of glass samples of composition [(x)MnF2–(x–80)NaPO3–(20)ZnF2] where x = 0, 10, 20, 30 and 40, has been prepared. IR and NMR spectroscopy have been performed, especially 19F MAS and 31P MAS NMR. On the basis of these measurements, glass structure may be described as a hybrid network of ZnF6 and MnF6 octahedra sharing corners and edges and also connected to tetrahedral fluorophosphate groups (PX)4 where X = O− or F−. Sodium cations fill vacancies of this network.