ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Calculation of liquidus curves in phase diagrams Na₄P₂0₇-Mg₂P₂0₇ and Na₄P₂0₇-Zn₂P₂0₇

P. Fellner and J. Majling

Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 3d Bratislava

Abstract: Liquidus curves were calculated in the phase diagrams  Na₄P₂0₇-Mg₂P₂0₇ and Na₄P₂0₇-Zn₂P₂0₇ . From the phase diagrams and using the method of thermodynamic analogy, the enthalpy of fusion of Zn₂P₂0₇ was determined (ΔH¹ = 17 kcal mol^-1). Good agreement between calculated and experimental data was achieved assuming a partial dissociation of the congruently melting compounds Na₇Mg_4.5(P₂0₇)₄ and Na₂ZnP₂0₇ ( α⁰ = 0.05).

Full paper in Portable Document Format: 276a728.pdf

Chemical Papers 27 (6) 728–731 (1973)