Ternary Reciprocal System K, Pb∥Cl, WO4

Resumo

The phase diagram of the ternary reciprocal system K, Pb∥Cl, WO₄ was studied for the first time by the calculation–experimental method and differential thermal and X-ray powder diffraction analyses. Chemical interactions between components were described, metathesis and complexation reactions were revealed, and the coordinates of binary and ternary eutectics were found (mol %): e₄(410°C, 48% KCl, 52% PbCl₂), e₅(424°C, 23% KCl, 77% PbCl₂), P(490°C, 63.5% KCl, 36.5% PbCl₂), e₆(487°C, 91% PbCl₂, 9% PbWO₄), e₇(428°C, 30.5% KCl, 60.5% PbCl₂, 9% PbWO₄) (eutectic in the stable section D₂–PbWO₄), e₈(650°C, 80% KCl, 20% PbWO₄), e₉(650°C, 70% KCl, 15% K₂WO₄, 15% PbWO₄) (binary eutectic in the stable section D₁–KCl), E₁(620°C, 59% KCl, 34% K₂WO₄, 7% PbWO₄), E₂(640°C, 75% KCl, 5% K₂WO₄, 20% PbWO₄), E3(400°C, 46% KCl, 6% PbWO₄, 48% PbCl₂), E₄(410°C, 21% KCl, 9% PbWO₄, 70% PbCl₂), and P_о(468°C, 56% KCl, 10% PbWO₄, 34% PbCl₂).