Abstract
The phase diagram of the NaVO3–Ca(VO3)2 system is mapped out. The system is shown to contain NaVO3-based solid solutions (0 –5 mol % Ca(VO3)2), Ca(VO3)2-based solid solutions (0 –17 mol % NaVO3), and the double metavanadate Na2Ca(VO3)4 . The results on the sequence of phase changes during heat treatment of an Na2CO3 + CaCO3 + 2V2O5 mixture and on the direction of diffusion flows (studied by the Tubandt method) indicate that the phase formation in the NaVO3–Ca(VO3)2 system is mainly due to the diffusion of Na+ ions.
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