Abstract
Phase equilibria data, obtained both by differential thermal analysis and by quenching, are presented for the system Na2O‐Nb2O5. Five compounds corresponding to the formulas 3Na2O.1Nb206, lNa2O. 1Nb2O5, lNa2O 4Nb2O6, lNazO.7Nb2O5, and lNa2O. 10Nb2O6 have been found. The compound 3Naz0.lNb2O5 melts congruently at 992°C. The compounds 1Na2O. 4Nb2O6, lNa2O.7Nb2O, and 1Na2O. 1Onb2O5 melt incongruently at 1265°, 1275°, and 1290°C., respectively. The well‐known perovskite structure phase NaNbO3 was found to melt congruently at 1412°C. The transition temperatures in NaNbO5 were checked by thermal analysis and only the major structural changes at 368° and 640°C. could be detected. A new disordered form of NaNbO3 could be preserved to room temperature by very rapid quenching.
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