Sodium Borate (Na2B4O7) B4Na2O7(l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 298.15 187.443 194.636 194.636 0. -3256.658 -3062.973 536.620 300 188.141 195.798 194.640 0.347 -3256.690 -3061.771 533.102 400 221.752 254.719 202.445 20.909 -3263.220 -2996.176 391.260 500 247.274 307.021 218.230 44.396 -3263.566 -2929.350 306.027 600 268.613 353.997 237.008 70.194 -3262.784 -2862.562 249.208 700 289.533 396.980 256.831 98.104 -3260.789 -2795.998 208.640 743.010 298.402 414.507 265.454 110.748 GLASS <--> LIQUID 743.010 444.885 414.507 265.454 110.748 TRANSITION 800 444.885 447.385 277.257 136.102 -3249.420 -2730.116 178.258 900 444.885 499.785 299.129 180.591 -3232.152 -2666.246 154.745 1000 444.885 546.658 321.579 225.079 -3215.404 -2604.270 136.033 1015.600 444.885 553.544 325.089 232.019 CRYSTAL <--> LIQUID 1100 444.885 589.060 343.999 269.567 3199.134 2543.947 121.802 1200 444.885 627.770 366.057 314.056 -3376.842 -2480.207 107.961 1300 444.885 663.380 387.577 358.544 -3359.618 -2406.188 96.682 1400 444.885 696.350 408.469 403.033 -3342.693 -2333.483 87.063 1500 444.885 727.043 428.696 447.521 -3326.043 -2261.980 78.769 1600 444.885 755.756 448.249 492.010 -3309.653 -2191.579 71.548 1700 444.885 782.727 467.139 536.498 -3293.508 -2122.194 65.207 1800 444.885 808.156 485.385 580.987 -3277.602 -2053.755 59.598 1900 444.885 832.209 503.012 625.475 -3261.926 -1986.192 54.604 2000 444.885 855.029 520.047 669.964 -3246.476 -1919.448 50.131 2100 444.885 876.735 536.519 714.452 -3231.250 -1853.472 46.103 2200 444.885 897.431 552.458 758.941 -3216.243 -1788.214 42.458 2300 444.885 917.207 567.890 803.429 -3201.454 -1723.637 39.145 2400 444.885 936.141 582.842 847.918 -3387.918 -1655.423 36.029 2500 444.885 954.302 597.340 892.406 -3373.872 -1583.525 33.086 2600 444.885 971.751 611.407 936.895 -3359.910 -1512.187 30.380 2700 444.885 988.541 625.066 981.383 -3346.033 -1441.383 27.885 2800 444.885 1004.720 638.337 1025.872 -3332.239 -1371.092 25.578 2900 444.885 1020.332 651.242 1070.360 -3318.532 -1301.296 23.439 3000 444.885 1035.414 663.798 1114.848 -3304.911 -1231.967 21.450