Synthesis of Aluminophosphate and Sodium Aluminophosphate Gels and Glasses

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The gels and glasses of AlPO₄ and sodium aluminophosphate with composition of 40Na₂O-20Al₂O₃-40P₂O₅ are prepared through a novel sol-gel route based on the reaction of alun mum lactate with H₃PO₄ and NaH₂PO₄ in aqueous solution. The sol-gel chemistry was characterized by high-resolution solution NMR and solid state ²⁷Al and ³¹P MAS NMR, and ²⁷Al{³¹P} Rotational Echo Double Resonance (REDOR) techniques. Detailed NMR data confirm that the local structures, the distributions of sites and the degree of Al/P connectivity in the sol-gel derived glasses are essentially indistinguishable with those of the melt-cooled glasses.