Ternary Reciprocal System K, Pb∥Cl, WO4

The phase diagram of the ternary reciprocal system K, Pb parallel to 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 %): e(4)(410 degrees C, 48% KCl, 52% PbCl2), e(5)(424 degrees C, 23% KCl, 77% PbCl2), P(490 degrees C, 63.5% KCl, 36.5% PbCl2), e(6)(487 degrees C, 91% PbCl2, 9% PbWO4), e(7)(428 degrees C, 30.5% KCl, 60.5% PbCl2, 9% PbWO4) (eutectic in the stable section D-2-PbWO4), e(8)(650 degrees C, 80% KCl, 20% PbWO4), e(9)(650 degrees C, 70% KCl, 15% K2WO4, 15% PbWO4) (binary eutectic in the stable section D-1-KCl), E-1(620 degrees C, 59% KCl, 34% K2WO4, 7% PbWO4), E-2(640 degrees C, 75% KCl, 5% K2WO4, 20% PbWO4), E-3(400 degrees C, 46% KCl, 6% PbWO4, 48% PbCl2), E-4(410 degrees C, 21% KCl, 9% PbWO4, 70% PbCl2), and P-D(468 degrees C, 56% KCl, 10% PbWO4, 34% PbCl2).