Phase Equilibria in the Ternary System MgO-Na2O-P2O5. The Partial System Mg2P2O7-Mg6Na8(P2O7)5-NaPO3-Mg(PO)2

• Autorzy: Podhajska-Kaźmierczak T.
• Języki publikacji: EN

Abstrakty

EN

The partial system Mg2P2O7-Mg6Na8(P2O7)5-NaPO3-Mg(PO3)2 in the ternary system MgO-Na2O-P2O5, have been investigated and its phase diagram has been proposed. Investigation was carried out by the differential thermal analysis (heating and cooling), X-ray diffraction methods, and microscopy in reflected light. In the composition range under investigation, five ternary phosphates: Mg6Na8(P2O7)5, Mg2Na3P5O16, MgNa(PO3)3, MgNa2(PO3)4 and MgNa4(PO3)6 appear. Two of them,Mg6Na8(P2O7)5 and MgNa4(PO3)6, congruently melt at 808 and 915°C, respectively, the remaining three melt incongruently. Phosphate Mg2Na3P5O16 melts incongruently at 675°C during heating and decomposes in a few stages. Peritectic melting point of MgNa(PO3)3 phosphate is 942°C, and that of MgNa4(PO3)6 is 785°C. For the composition range of Mg2P2O7-Mg6Na8(P2O7)5- NaPO3-Mg(PO3)2, it has been found that six quasi-binary sections, four ternary peritectics (tP 1 = 660°C, tP 2 =876°C, t P 3 = 578°C, tP 4 = 555°C) and three ternary eutectics (tE 1 = 560°C, tE 2 = 845°C, tE 3 = 540°C) occur.

Słowa kluczowe

EN

phase equilibria; magnesium-sodium phosphates; DTA; X-ray powder diffraction

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2005
• Tom: Vol. 79 / nr 6
• Strony: 1033--1040
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Podhajska-Kaźmierczak T.

• Faculty of Engineering and Economics, Department of Inorganic Chemistry, Wrocław University of Economics, Komandorska 118/120, 53-345 Wrocław, Poland

Bibliografia

• 1.Berak J., Roczn. Chem., 32, 17 (1958) (in Polish).
• 2.Podhajska-Kazmicrczak T. and Znaniierowska T„ Polish J. Chem., 66, 277 (1992).
• 3.Podhajska-Kaimierczak T. and Znamierowska T., J. Thermal Anal., 45, 1541 (1995).
• 4.Podhajska-Kazmierczak T. and Znamierowska T., “Proceedings of the Vlth Domestic St. Bretszna Seminar”, Plock, 154 (1993) (in Polish).
• 5.Thonnierieux B., Grenier J.C., Durif A. and Martin C., Compt. Rend., 267, 968 (1968).
• 6.Volfkowits S.J., Pozharskaya T.D. and Kubasova L.V., Dokl. Akad. Nauk SSSR, 197, 583 (1971).
• 7.Majling J., Vojteckova A. and Petrovic J., Chem. Zvesti, 28, 289 (1974).
• 8.Ustiancev V.M. and Tretnikova M.G., Ogneupory, 5, 53 (1976).
• 9.Shepielev J.F., Smolin J.J., Domanskij A.J. and Lavrov A.V., Dokl. Akad. Nauk SSSR, 272,610(198'
• 10.Podhajska-Kazmierczak T. and Znamierowska T., Polish J. Chem., 65, 1121 (1991).
• 11.Podhajska-Kazmierczak T., J. Thermal Anal, 36, 2191 (1991).
• 12.Podhajska-Kazmierczak T. and Znamierowska T., J. Thermal Anal., 44, 1195 (1991).
• 13.Podhajska-Kazmierczak T., Prace Naukowe AE-Wroclaw, 610, 303 (1992) (in Polish).
• 14.Podhajska-Kazmierczak T., Prace Naukowe AE-Wroclaw, 526, 255 (1990) (in Polish).
• 15.Podhajska-Kazmierczak T., Prace Naukowe AE-Wroctaw, 888. 69 (2001) (in Polish
• 16.Podhajska-Kazmicrczak T., Prace Naukowe AE-Wroclaw, 1017, 333 (2004) (in Polish).