Lead Fluoride, Beta (PbF2) F2Pb1(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 298.15 74.266 114.398 114.398 0. -675.990 -630.320 110.429 300 74.392 114.857 114.399 0.138 -675.960 -630.037 109.699 400 76.776 136.571 117.344 7.691 -674.354 -614.971 80.307 500 80.584 154.051 122.988 15.531 -672.694 -600.315 62.714 583.000 88.868 166.934 128.336 22.502 ALPHA <--> BETA 600 91.128 169.518 129.466 24.031 670.557 586.025 51.018 700 147.486 186.826 136.333 35.345 -670.616 -571.426 42.640 800 105.939 203.976 143.801 48.140 -664.448 -557.729 36.416 900 94.433 215.393 151.145 57.823 -661.404 -544.583 31.607 1000 94.433 225.342 158.076 67.266 -658.606 -531.753 27.776 1100 94.433 234.342 164.607 76.709 -655.807 -519.203 24.655 1103.000 94.433 234.600 164.797 76.993 BETA <--> LIQUID 1200 94.433 242.559 170.765 86.153 653.003 506.908 22.065 1300 94.433 250.118 176.583 95.596 -650.200 -494.847 19.883 1400 94.433 257.116 182.088 105.039 -647.410 -483.002 18.021 1500 94.433 263.631 187.310 114.482 -644.642 -471.355 16.414