{ "counts": { "above_hull": 0, "entries": 4, "intervals": 3, "vertices": 4 }, "elements": [ "B", "C" ], "flags": [ "has_intermediate_phases", "solution_phases" ], "isotherms": [ { "element_reference": { "B": { "energy": -1759.0865001734835, "phase": "BETA_RHOMBO_B" }, "C": { "energy": -1712.0721424899177, "phase": "GRAPHITE_A9" } }, "intervals": [ { "enthalpy": { "intercept": 0.0, "slope": -138830.14897560215 }, "entropy": { "intercept": 0.0, "slope": 1.4451885620294385 }, "intercept": 0.0, "kind": "two_phase", "left": { "phase": "BETA_RHOMBO_B", "x": 0.0 }, "mu_a_rel": 0.0, "mu_b_rel": -139261.0319453712, "right": { "phase": "B4C_D1G", "x": 0.07436072225530177 }, "slope": -139261.0319453712, "x_hi": 0.07436072225530177, "x_lo": 0.0 }, { "enthalpy": { "entropy_form": null, "hermite": [ [ -10323.510148636919, -1029.237953671094, 0.0029283845667578134, -0.0032418565658645093 ], [ -11352.74841578001, -1029.2377575007904, -0.003121221592891743, 0.0043757436344549205 ], [ -12381.984918758762, -1286.5462732035294, -0.0022754386309316033, 0.0017152699847429176 ], [ -13668.531752130944, -771.9226121352059, -0.008217263365736471, 0.003909919999500744 ], [ -14440.458671609515, -1286.5477649553204, 0.005431210091046523, -0.00453126557476935 ], [ -15727.005536620318, -771.9245464992256, -0.004029337865176785, 0.0016789026840342558 ], [ -16498.932433554728, -1286.5459474453871, 1.3443092257148237e-05, -1.1423468322391273e-05 ], [ -17785.47837898049, -1128.8759582844448, 1412.7014069649351, -569.7604247312968 ], [ -18071.413355031294, -37.12873030050937, 1.3892713468521833e-07, -1.8917489796876907e-10 ], [ -18108.54208519306, -37.12873025433418, 9.278340229457172e-08, -2.949462896140176e-11 ], [ -18145.670815354642, -46.41091276465022, 1.2497413592882367e-07, -6.240090044684621e-08 ], [ -18192.081728056724, -27.846547341276498, -6.298684027683521e-07, 3.499695893083299e-07 ], [ -18219.928275677892, -46.41091290091949, 8.975485599194144e-08, 1.774474114313307e-07 ], [ -18266.339188311602, -27.84654792916626, 4.1046768828323366e-07, -1.709358876667011e-07 ], [ -18294.18573600124, -27.846547339769582, -6.333701563221439e-07, 3.518415283565446e-07 ], [ -18322.032283622546, -46.4109275002215, 1.2227996393221474e-07, -6.624781434538818e-08 ] ], "knots": [ 0.07436072225530177, 0.08221313038561712, 0.09006552549807552, 0.09988101938864853, 0.10577031572299234, 0.11558580961356535, 0.12147510594790917, 0.13129059983848218, 0.137179896172826, 0.1450322912852844, 0.1528846863977428, 0.16270018028831582, 0.16858947662265963, 0.17840497051323265, 0.18429426684757644, 0.19018356318192026, 0.19999906018990846 ], "max_abs_error": 16.881790362411266 }, "entropy": { "entropy_form": { "R": 8.31446261815324, "kind": "ideal_mixing_entropy" }, "hermite": [ [ -2.094000308134173, 0.04601684508137468, -0.065026367945311, 0.012953551287432898 ], [ -2.1000562797106763, -0.044717728823587675, -0.025446539460332526, 0.0022445381443616935 ], [ -2.1679760098502343, -0.08878609154308512, -0.01778888994614107, 0.0006439050779167149 ], [ -2.2739070862615445, -0.12239085169584099, -0.01564160003566134, -4.722670913831495e-05 ], [ -2.411986764702185, -0.153775372967328, -0.01609737178995932, -0.0007197568660825826 ], [ -2.5825792663255553, -0.18804673038807226, -0.01926275677930825, -0.0021665953781277725 ], [ -2.792055348871063, -0.2908828616861178, -0.031597138019131, -0.0336062049861664 ], [ -3.1481415535624784, -0.5462554286940909, 0.8899741904869484, -0.3975192762265553 ], [ -3.2019420679961774, 0.059192047747331, -0.05100825265049469, 0.009076313741641863 ], [ -3.1846819591576976, -0.015265662609398083, -0.022499920874036843, 0.0018959500574742202 ], [ -3.220551592583659, -0.05450560061026246, -0.015945185037614093, 0.0006322833912540821 ], [ -3.290370094840281, -0.08446678819265627, -0.013761920094838023, 9.29931473539064e-05 ], [ -3.3885058099804213, -0.11168434785646437, -0.013594363045627389, -0.0003584804844021794 ], [ -3.5141430013669157, -0.1399041030224826, -0.015235041070796207, -0.0011122924395952083 ], [ -3.6703944378997893, -0.2169697182541699, -0.02879550459129293, -0.010041005564187466 ], [ -3.9262006663094393, -0.18045179609934922, -0.018786856102618654, -0.03503232033816228 ] ], "knots": [ 0.07436072225530177, 0.08221313038561712, 0.09006552549807552, 0.09791792061053393, 0.10577031572299234, 0.11362271083545075, 0.12147510594790917, 0.13129059983848218, 0.137179896172826, 0.1450322912852844, 0.1528846863977428, 0.16073708151020122, 0.16858947662265963, 0.17644187173511805, 0.18429426684757644, 0.19410976073814945, 0.19999906018990846 ], "max_abs_error": 0.011778348925231441 }, "entropy_form": { "RT": 2478.957029602388, "kind": "ideal_mixing" }, "hermite": [ [ -9699.183956766714, -1042.9578760320971, 19.39053998745203, -3.8653431729135264 ], [ -10726.616635984274, -1015.90516665203, 7.583764518507337, -0.664833304121089 ], [ -11735.602871421914, -1002.7654453692815, 5.303809897636029, -0.19258432609080955 ], [ -12733.257091219648, -992.748366928701, 4.669816447245466, 0.010823987542607938 ], [ -13721.324817713561, -983.3900845140198, 4.8017344606668075, 0.21345121861679672 ], [ -14699.699716548297, -973.1757023495989, 5.7534926648035025, 0.6407949442806284 ], [ -15666.481131288812, -1199.8192222337673, 9.420700143644808, 10.019678593103436 ], [ -16846.859974785835, -966.0099022192944, 1147.3556020712413, -451.24005252434915 ], [ -17116.754327458235, -54.77683933638171, 15.208110666659202, -2.706102942232981 ], [ -17159.02915907019, -32.57727294730213, 6.708351501351249, -0.5652775096826055 ], [ -17185.463358025823, -20.877885389753107, 4.7540569690678325, -0.18851529319327653 ], [ -17201.775701739705, -11.944957355182893, 4.103116569342161, -0.02772590669344588 ], [ -17209.645268432232, -3.8300420073501433, 4.053159501541863, 0.10688095599466152 ], [ -17209.31526998205, 4.5836787018415635, 4.542326400318414, 0.3316305384796596 ], [ -17199.85763434141, 18.278609264470617, 8.585378651487055, 2.993726405313417 ], [ -17169.99992002014, 25.955140541367925, 5.601301287724027, 10.444886247306158 ] ], "kind": "single_phase", "knots": [ 0.07436072225530177, 0.08221313038561712, 0.09006552549807552, 0.09791792061053393, 0.10577031572299234, 0.11362271083545075, 0.12147510594790917, 0.13129059983848218, 0.137179896172826, 0.1450322912852844, 0.1528846863977428, 0.16073708151020122, 0.16858947662265963, 0.17644187173511805, 0.18429426684757644, 0.19410976073814945, 0.19999906018990846 ], "max_abs_error": 13.370075630355132, "phase": "B4C_D1G", "x_hi": 0.19999906018990846, "x_lo": 0.07436072225530177 }, { "enthalpy": { "intercept": -22960.527040664652, "slope": 22960.52704066465 }, "entropy": { "intercept": 0.0001184662894382538, "slope": -0.0001184662894382538 }, "intercept": -22960.562361388835, "kind": "two_phase", "left": { "phase": "B4C_D1G", "x": 0.19999906018990846 }, "mu_a_rel": -22960.562361388835, "mu_b_rel": 0.0, "right": { "phase": "GRAPHITE_A9", "x": 1.0 }, "slope": 22960.562361388835, "x_hi": 1.0, "x_lo": 0.19999906018990846 } ], "temperature_K": 298.15, "vertices": [ { "collinear": false, "degenerate": [], "energy": 0.0, "energy_per_atom": 0.0, "enthalpy": 0.0, "entries_at_x": 1, "entropy": 0.0, "formula": "", "nsites": null, "phase": "BETA_RHOMBO_B", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.0 }, { "collinear": false, "degenerate": [], "energy": -10355.550917476456, "energy_per_atom": -10355.550917476456, "enthalpy": -10323.510148636919, "entries_at_x": 1, "entropy": 0.10746526526761002, "formula": "", "nsites": null, "phase": "B4C_D1G", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.07436072225530177 }, { "collinear": false, "degenerate": [], "energy": -18368.471467679283, "energy_per_atom": -18368.471467679283, "enthalpy": -18368.44321106674, "entries_at_x": 1, "entropy": 9.477314288641736e-05, "formula": "", "nsites": null, "phase": "B4C_D1G", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.19999906018990846 }, { "collinear": false, "degenerate": [], "energy": 0.0, "energy_per_atom": 0.0, "enthalpy": 0.0, "entries_at_x": 1, "entropy": 0.0, "formula": "", "nsites": null, "phase": "GRAPHITE_A9", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 1.0 } ] } ], "mp_agreement": { "comparable": false, "comparable_note": "CALPHAD isotherms have no upstream stability flag to compare against", "max_abs_delta_energy_above_hull": 0.0, "only_mp_stable": [], "only_ours_stable": [], "stable_sets_match": true }, "provenance": { "assessment": "BC-94Kas", "builder_version": 1, "engine": { "numpy": "2.5.1", "pycalphad": "0.11.2", "python": "3.13.15" }, "fit_tol": 1.0, "observed_at": "2026-09-03T00:17:48Z", "phase_families": {}, "sample_conditions": { "endpoint_tol": 1.0, "fit_samples": 65, "order_tol": 0.0001, "pressure_Pa": 101325.0, "redundant_tol": 1.0, "refine_tol": 1e-07, "step": 0.002, "temperature_K": 298.15 }, "source_path": "databases/sgte-binary/BC-94Kas.tdb", "source_sha256": "178cb3073b3b2693468b4728a05ac774749084a7bc39cab3beca920705d1a77d" }, "reference": { "kind": "calphad_formation_T", "per": "mole_atoms", "temperature_K": 298.15, "units": "J/mol-atoms" }, "schema_version": 1, "system_id": "B-C", "x_element": "C" }