P 56 Phase Relations in the NaVO3-Ca(VO3)2 System / E. M. Gorbunova, B. V. Slobodin, T. I. Krasnenko, T. P. Sirina // Inorganic Materials. - 2004. - Vol. 40, № 4. - P. 407-410 : il. - Bibliogr. : p. 410 (6 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ФАЗОВЫЕ ДИАГРАММЫ -- ВАНАДАТ КАЛЬЦИЯ -- ВАНАДАТ НАТРИЯ Аннотация: 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+ 2V2O5mixture 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 Полный текст |