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

Composition coordinate of the transition point in phase diagrams with polymorphous transformation of one component

I. Koštenská

Department of Inorganic Technology, Slovak Technical University, 880 37 Bratislava

Abstract: The rule of constancy of the product of the transition point coorinate and the Stortenbeker correction factor was theor. derived for binary systems without solid solns., but with a component showing a polymorphous transformation. This rule holds with a satisfactory accuracy in the interval 0.9 ≤x_i<1 (x_i being the compn. coordinate of the transition point). For exptl. verification, the liquidus curve of BaCl₂ was measured using the TA method in the systems BaCl₂-NaCl, BaCl₂-NaF, and BaCl₂-Na₂SO₄ in the vicinity of the transition point. The rule of constancy was obeyed very satisfactorily with all 3 systems investigated. The course of the liquidus curve of BaCl₂ was analyzed thermodynamically applying CTC I and CTC III (criterion of thermodn. consistency I and III). The calcd. and the measured values showed a very good agreement.

Full paper in Portable Document Format: 304a446.pdf

Chemical Papers 30 (4) 446–457 (1976)