Oxynitride phosphate glasses

The application of P NMR to structural studies of alkali and alkaline earth phosphate and aluminophosphate glasses, fluorophosphate glasses and phosphorus oxynitride glasses has been reviewed by Kirkpatrick and Brow (1995). 

M-SiAlON systems contain a combination of M atoms. Glass formation is found to be easier, more the types of atoms present in the nitrided glasses. Several simple silicates and phosphates which are nitrided have provided much insight into the stmcture of oxynitride glasses. 

The so-called oxynitride glasses can be obtained by melting phosphate salts in an atmosphere of ammonia, or alternatively by melting a nitride such as Mg3N2 with sodium metaphosphate. 

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