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The phase diagram of system Na_2O-Al_2O_3-H_2O has been investigated by many authors. The left part (Al_2O_3·3H_2O as solid phase) of the diagram of Na_2O-Al_2O_3-H_2O system is of no problem, but the right part (hydrated sodium aluminates as solid phases) is in controversies. Jucaitis concluded that there were two hydrated sodium aluminates, i.e. Na_2O·Al_2O_3·2.5H_2O and 3Na_2O·Al_2O_3·6H_2O. Kuznetsov suspected the existence of the latter and believed that it was actually a mixture of Na_2O·Al_2O_3·2.5H_2O and
The left diagram of the system of Na 2 O-Al 2 O 3 -H 2 O has been investigated by many authors. The left part (Al 2 O 3 · 3H 2 O as solid phase) of the diagram of Na 2 O-Al 2 O 3 -H 2 O system is of no problem, but the right part (hydrated sodium Jucasitis was that there were two hydrated sodium aluminates, ie Na 2 O · Al 2 O 3 · 2.5H 2 O and 3Na 2 O · Al 2 O 3 · 6H 2 O. Kuznetsov suspected the existence of the latter and believed that it was actually a mixture of Na 2 O · Al 2 O 3 · 2.5H 2 O and