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The structural behavior of Al 3+  in peralkaline glasses and melts along the Na 2 Si 3 O 7 -Na 2 (NaAl) 3 O 7  join has been examined to 1200 °C at ambient pressure with  29 Si MAS NMR and Raman spectroscopy. The distribution of Al 3+  among coexisting Q 4 , Q 3 , and Q 2  structural units in the glasses and melts was determined as a function of bulk Al/(Al + Si) and temperature. The Al 3+  resides principally in Q 4  structural units, which contain more than 70% of the total amount of Al 3+ . The Q 2  units contain the smallest amount of Al 3+  among the Q 4 , Q 3 , and Q 2  structural units. There is no evidence for temperature-dependent distribution of Al 3+  among the coexisting structural units at least to 1100- 1200 °C.

The structural behavior of Al 3+ in peralkaline melts and glasses in the system Na 2 O-Al 2 O 3 -SiO 2