. . "Thermodynamic properties of (Na₂O)₄·Fe₂O₃, 6° to 1,200° K"@en . . . . . . . . "Thermodynamic properties of (Na 2 O) 4 Fe 2 O 3 , 6° to 1,200° K" . . . . . . . . . "Thermodynamic properties of (Na2O4)·Fe2O3, 6 [degrees] to 1,200 [degrees] K" . . . . . . . . "Sodium ferrite." . .