Potassium Borate (K2B4O7) B4K2O7(cr,l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 250 298.15 170.498 208.363 208.363 0. -3334.230 -3136.756 549.547 300 171.335 209.420 208.366 0.316 -3334.297 -3135.531 545.944 400 206.271 263.696 215.530 19.267 -3342.152 -3067.880 400.624 500 232.798 312.737 230.150 41.293 -3343.971 -2999.075 313.311 600 250.538 356.839 247.657 65.509 -3344.817 -2930.004 255.080 700 262.379 396.388 266.130 91.181 -3345.149 -2860.838 213.478 800 271.123 432.022 284.677 117.876 -3345.218 -2791.644 182.276 900 277.399 464.322 302.871 145.306 -3345.200 -2722.448 158.007 1000 283.257 493.860 320.514 173.346 -3345.151 -2653.256 138.592 1088.000 287.723 517.940 335.520 198.474 CRYSTAL <--> LIQUID 1088.000 457.879 613.958 335.520 302.940 TRANSITION 1100 459.361 618.988 338.585 308.444 -3396.492 -2576.011 122.325 1200 471.143 659.470 363.656 354.978 -3376.892 -2502.281 108.921 1300 481.913 697.614 387.892 402.639 -3356.496 -2430.219 97.647 1400 491.670 733.691 411.315 451.327 -3335.372 -2359.755 88.044 1500 500.406 767.916 433.957 500.939 -3313.601 -2290.825 79.774 1600 507.268 800.434 455.854 551.327 -3291.314 -2223.364 72.585 1700 513.544 831.378 477.041 602.373 -3268.619 -2157.310 66.286 1800 519.234 860.896 497.553 654.017 -3245.569 -2092.603 60.726 1900 524.339 889.108 517.424 706.200 -3222.218 -2029.185 55.786 2000 528.858 916.121 536.688 758.865 -3198.621 -1967.003 51.373 2100 532.188 942.006 555.377 811.920 -3174.868 -1906.006 47.409 2200 535.234 966.835 573.519 865.293 -3151.033 -1846.140 43.833 2300 537.995 990.689 591.142 918.957 -3127.143 -1787.363 40.592 2400 540.472 1013.639 608.271 972.883 -3304.266 -1725.350 37.551 2500 542.665 1035.747 624.931 1027.042 -3280.672 -1660.046 34.685 2600 544.573 1057.069 641.144 1081.406 -3256.986 -1595.688 32.058 2700 546.196 1077.653 656.932 1135.947 -3233.240 -1532.242 29.643 2800 547.535 1097.542 672.315 1190.636 -3209.468 -1469.676 27.417 2900 548.589 1116.775 687.311 1245.445 -3185.701 -1407.963 25.360 3000 549.359 1135.387 701.938 1300.344 -3161.975 -1347.065 23.454