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  • 1 Laboratoire de Physico-Chimie Minerale II, Associee au C.N.R.S. n∘ 116 Universite Lyon I 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex
  • 2 Laboratoire de Chimie Marine et de Physico-Chimie Minerale Universite de Toulon et du var Chateau Saint-Michel 83130 Lagarde
  • 3 Departement de Chimie-Physique des Processus Industriels Ens Mines de St-etienne 158 Crs Fauriel 42023 Saint-Etienne Cedex France
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The phase diagram of solid-solid equilibria in the system Ca3(PO4)-CaNaPO4 has been studied by thermal analysis. The results are confirmed by X-ray diffraction at different temperatures. This study was limited to that of mixtures in a temperature range determined by previous results. The present work confirms the existence of two metastable diagrams which are superimposed on the stable diagram.