Lead Sulfide (PbS) Pb1S1(cr,l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 0. 0. INFINITE -11.511 -98.545 -98.545 INFINITE 100 39.748 41.296 133.734 -9.244 -98.734 -97.928 51.152 200 47.614 71.920 95.823 -4.781 -98.437 -97.239 25.396 298.15 49.438 91.343 91.343 0. -98.324 -96.685 16.939 300 49.455 91.649 91.344 0.091 -98.324 -96.675 16.833 400 50.459 106.008 93.295 5.085 -100.657 -96.024 12.539 500 51.463 117.375 97.013 10.181 -102.302 -94.688 9.892 600 52.384 126.839 101.217 15.373 -103.584 -93.039 8.100 700 53.346 134.988 105.473 20.661 -109.465 -90.400 6.746 800 54.308 142.176 109.620 26.045 -110.310 -87.616 5.721 900 55.271 148.627 113.602 31.523 -164.074 -83.658 4.855 1000 56.191 154.498 117.402 37.096 -163.312 -74.763 3.905 1100 57.153 159.900 121.023 42.764 -162.439 -65.949 3.132 1200 58.074 164.912 124.474 48.525 -161.459 -57.220 2.491 1300 59.036 169.599 127.767 54.382 -160.375 -48.577 1.952 1386.500 59.832 173.428 130.497 59.523 CRYSTAL <--> LIQUID 1386.500 66.944 187.007 130.497 78.351 TRANSITION 1400 66.944 187.656 131.045 79.255 -140.283 -40.204 1.500 1500 66.944 192.275 134.975 85.949 -138.386 -33.122 1.153 1600 66.944 196.595 138.693 92.644 -136.513 -26.165 0.854 1700 66.944 200.654 142.219 99.338 -134.667 -19.325 0.594 1800 66.944 204.480 145.573 106.033 -132.850 -12.593 0.365 1900 66.944 208.099 148.769 112.727 -131.065 -5.961 0.164 2000 66.944 211.533 151.823 119.421 -129.312 0.578 -0.015