NaCl–NaVO3–Na2EO4 (E = Mo or W) Three-Component Systems

• Published in: Russian journal of inorganic chemistry 2023-04, Vol.68 (4), p.439-446
• Main Authors: Gubanova, T. V., Kravets, N. S., Garkushin, I. K.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Crystallization; Differential thermal analysis; Inorganic Chemistry; Melting points; Phase assemblages; Phase diagrams; Phase equilibria; Physicochemical Analysis of Inorganic Systems; Sodium molybdate; Sodium tungstate; Ternary systems
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023623600156

Phase equilibria in the NaVO 3 –Na 2 WO 4 two-component system and in the NaCl–NaVO 3 –Na 2 EO 4 (E = Mo or W) three-component system were studied. The phase assemblages of the NaCl–NaVO 3 –Na 2 EO 4 (E = Mo or W) three-component systems were analyzed. Differential thermal analysis (DTA) showed that the binary system is a eutectic system and the three-component systems are partitioned by the compound Na 3 ClEO 4 into two secondary triangles, in each of which eutectics were found. The percentages of the components in the ternary eutectics and their melting points were determined. Phase equilibria were described for all elements of the phase diagrams studied in this work. The Na 2 WO 4 crystallization field is represented by α, β, and γ phases, and the Na 2 MoO 4 crystallization field, by δ, γ, and β phases. The smallest crystallization field in the ternary systems belongs to low-melting NaVO 3 .