Potassium Borate (K2B4O7) B4K2O7(l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 250 298.15 170.498 237.120 237.120 0. -3289.042 -3100.143 543.132 300 171.335 238.177 237.124 0.316 -3289.110 -3098.971 539.579 400 206.271 292.453 244.287 19.266 -3296.965 -3034.195 396.225 500 232.840 341.499 258.908 41.296 -3298.781 -2968.266 310.093 600 250.538 385.610 276.416 65.516 -3299.623 -2902.072 252.648 676.000 259.821 416.068 290.428 84.933 GLASS <--> LIQUID 676.000 369.237 416.068 290.428 84.933 TRANSITION 700 375.221 429.053 294.959 93.866 -3297.277 -2835.830 211.612 800 402.501 480.977 315.000 132.781 -3285.126 -2770.715 180.909 900 426.266 529.790 336.181 174.249 -3271.070 -2707.239 157.124 1000 446.558 575.818 357.866 217.952 -3255.357 -2645.420 138.183 1088.000 457.879 613.958 377.052 257.753 CRYSTAL <--> LIQUID 1100 459.361 618.988 379.664 263.257 3396.492 2576.011 122.325 1200 471.143 659.470 401.312 309.790 -3376.892 -2502.281 108.921 1300 481.913 697.614 422.651 357.452 -3356.496 -2430.219 97.647 1400 491.670 733.691 443.591 406.139 -3335.372 -2359.755 88.044 1500 500.406 767.916 464.082 455.752 -3313.601 -2290.825 79.774 1600 507.268 800.434 484.096 506.140 -3291.314 -2223.364 72.585 1700 513.544 831.378 503.622 557.186 -3268.619 -2157.310 66.286 1800 519.234 860.896 522.657 608.830 -3245.569 -2092.603 60.726 1900 524.339 888.108 541.207 661.013 -3222.218 -2029.185 55.786 2000 528.858 916.121 559.282 713.678 -3198.621 -1967.003 51.373 2100 532.188 942.006 576.895 766.732 -3174.868 -1906.006 47.409 2200 535.234 966.835 594.059 820.106 -3151.032 -1846.140 43.833 2300 537.995 990.689 610.789 873.770 -3127.143 -1787.363 40.592 2400 540.472 1013.639 627.099 927.696 -3304.266 -1725.350 37.551 2500 542.665 1035.747 643.005 981.855 -3280.672 -1660.046 34.685 2600 544.573 1057.069 658.523 1036.219 -3256.986 -1595.688 32.058 2700 546.196 1077.653 673.668 1090.760 -3233.240 -1532.242 29.643 2800 547.535 1097.542 688.453 1145.449 -3209.468 -1469.676 27.417 2900 548.589 1116.775 702.893 1200.257 -3185.701 -1407.963 25.360 3000 549.359 1135.387 717.001 1255.157 -3161.975 -1347.065 23.454