{ "counts": { "above_hull": 0, "entries": 5, "intervals": 4, "vertices": 5 }, "elements": [ "B", "C" ], "flags": [ "has_intermediate_phases", "solution_phases" ], "isotherms": [ { "element_reference": { "B": { "energy": -1759.0853039343567, "phase": "BETA_RHOMBO_B" }, "C": { "energy": -1712.072181881769, "phase": "GRAPHITE_A9" } }, "intervals": [ { "enthalpy": { "entropy_form": null, "hermite": [ [ 0.0, -16.771156454628407, -0.0016954898243994876, 0.013855415745641864 ] ], "knots": [ 0.0, 0.00011381860521009242 ], "max_abs_error": 0.0019876533343872183 }, "entropy": { "entropy_form": { "R": 8.31446261815324, "kind": "ideal_mixing_entropy" }, "hermite": [ [ 0.0, -0.002068194140179495, 3.0228304628344017e-05, -1.52439123266351e-05 ] ], "knots": [ 0.0, 0.00011381860521009242 ], "max_abs_error": 2.187346685526056e-06 }, "entropy_form": { "RT": 2478.957029602388, "kind": "ideal_mixing" }, "hermite": [ [ 0.0, -16.154524371751634, -0.010708058792292974, 0.018400388165733972 ] ], "kind": "single_phase", "knots": [ 0.0, 0.00011381860521009242 ], "max_abs_error": 0.0026398107481382382, "phase": "BETA_RHOMBO_B", "x_hi": 0.00011381860521009242, "x_lo": 0.0 }, { "enthalpy": { "intercept": 2.7045122965661967, "slope": -171004.63311201698 }, "entropy": { "intercept": 0.010104888503018116, "slope": -23.003123758864735 }, "intercept": -0.3082602106094434, "kind": "two_phase", "left": { "phase": "BETA_RHOMBO_B", "x": 0.00011381860521009242 }, "mu_a_rel": -0.3082602106094434, "mu_b_rel": -164146.56002352212, "right": { "phase": "B4C_D1G", "x": 0.07134853354401324 }, "slope": -164146.2517633115, "x_hi": 0.07134853354401324, "x_lo": 0.00011381860521009242 }, { "enthalpy": { "entropy_form": null, "hermite": [ [ -12198.225289477856, -803.2115063333623, 24.481795942739836, -10.20052913316772 ], [ -12987.155529001646, -1308.0818277303997, 0.00033322595299978275, 0.0005513396044989349 ], [ -14295.236472166489, -1046.463679027569, 0.0017246778443222865, 0.0017823865782702342 ], [ -15341.696644129635, -1046.455299239573, 0.00942372790814261, 0.009200516637065448 ], [ -16388.133319124663, -784.8079904110892, 0.034519257585998275, 0.010351600400099414 ], [ -17172.896438677755, -1307.8511411825639, 0.254795126178351, 0.17439761943592202 ], [ -18480.318387114705, -1306.7718509661972, 2.0538603095974395, -2.501045303861247 ], [ -19787.537423075173, -830.2781873711318, -48.303125192025554, 295.89998954945617 ], [ -20370.218746088878, -259.80341621837755, -3.765964720514603e-06, 1.0277308319928125e-06 ], [ -20630.022165045484, -433.00569825793895, -3.020995791302994e-07, 3.1427225621882826e-07 ], [ -21063.02786329125, -259.8034197474275, 4.281540270767437e-06, -2.9583637228824955e-06 ], [ -21322.831281715495, -433.00570104352124, 1.0280072615387326e-06, 8.940585814798396e-06 ], [ -21755.836972790425, -346.404543830482, -1.0136631317436695e-05, 0.00018156612350139767 ], [ -22102.241345191425, -346.40416990088966, 9.88260376288963e-05, 0.0035104829207739385 ], [ -22448.641905783352, -346.39525306483847, 0.017491541810159106, 0.03139287956582848 ], [ -22794.98827442681, -346.24367756207687, 0.5465162216410135, -0.7691217906817656 ] ], "knots": [ 0.07134853354401324, 0.07737907542643173, 0.08742997213400222, 0.0954706895000586, 0.10351140686611499, 0.10954194489065727, 0.11959284159822775, 0.12964373830579823, 0.13567427633034052, 0.1417048143548828, 0.15175571106245328, 0.1577862490869956, 0.16783714579456607, 0.17587786316062246, 0.18391858052667887, 0.19195929789273525, 0.20000000000000515 ], "max_abs_error": 8.76740709776277 }, "entropy": { "entropy_form": { "R": 8.31446261815324, "kind": "ideal_mixing_entropy" }, "hermite": [ [ -3.7688931727430126, 0.1680380747567836, -0.1507335388824521, 0.04114738336652468 ], [ -3.7104412535021547, -0.008651644417711615, -0.03335565504891022, 0.003908327421271202 ], [ -3.748540225547506, -0.06348517116747665, -0.020328127272984275, 0.0010598505271595116 ], [ -3.8312936734608076, -0.100909777557348, -0.016714369581983107, 0.00017809641418861655 ], [ -3.948739724185949, -0.13377016239585693, -0.01629929838476407, -0.00038686687018696375 ], [ -4.099196051836758, -0.16747707752589316, -0.017994765033064325, -0.001370767494663 ], [ -4.2860386618903785, -0.2589908631628868, -0.025606768756209097, -0.030837819207620465 ], [ -4.601474113017095, -0.2733924365016862, -0.1749305808562659, 0.30571588829624996 ], [ -4.7440812420787974, 0.09094770143357246, -0.07275386048908672, 0.015704107193904804 ], [ -4.710183293940407, -0.006919715952440341, -0.02571487752855539, 0.0024618332372341456 ], [ -4.7403560541841685, -0.050870293395347654, -0.01729150295602694, 0.0007871918873349482 ], [ -4.807730658648209, -0.08305381436251481, -0.01456659703441332, 0.00015131946099700144 ], [ -4.90519975058414, -0.111703430753904, -0.014192308369228357, -0.0003387647152521822 ], [ -5.031434254422525, -0.14105867109416662, -0.015770146903279852, -0.0011106008868686235 ], [ -5.189373673306842, -0.21974860335191024, -0.029587381679273772, -0.00998810978167386 ], [ -5.448697768119698, -0.1826814697239671, -0.018902934148640027, -0.0375682372340122 ] ], "knots": [ 0.07134853354401324, 0.07938925476794582, 0.08742997213400222, 0.0954706895000586, 0.10351140686611499, 0.11155212423217137, 0.11959284159822775, 0.12964373830579823, 0.13567427633034052, 0.1437149936963969, 0.15175571106245328, 0.1597964284285097, 0.16783714579456607, 0.17587786316062246, 0.18391858052667887, 0.19396947723424934, 0.20000000000000515 ], "max_abs_error": 0.009058248542110903 }, "entropy_form": { "RT": 2478.957029602388, "kind": "ideal_mixing" }, "hermite": [ [ -11074.529790024531, -840.7869263343964, 49.98212113972909, -15.340047211321462 ], [ -11880.674642430517, -1312.761566575402, 19.08187915995586, -3.2548740735401225 ], [ -13177.609203919505, -1027.53557524395, 6.062555824177252, -0.3142120480260928 ], [ -14199.396435387302, -1016.3690490607987, 4.99281301871099, -0.04389892923074967 ], [ -15210.816570358624, -1006.5270799631471, 4.9107816420073505, 0.15473732790269423 ], [ -16212.27813135186, -996.2606668011869, 5.612881860055609, 0.4899562209028545 ], [ -17202.43596007209, -1229.553725114156, 9.688518414193595, 6.693250492928428 ], [ -18415.607916279125, -748.7662324281719, 3.852427490288406, 204.7507974539185 ], [ -18955.77092376308, -373.5206121402807, 21.691555348712427, -4.682175053836545 ], [ -19312.282155608485, -344.34144553024083, 7.666890970183886, -0.7339955676870886 ], [ -19649.690705736237, -331.23758168744257, 5.15546594382721, -0.23470425868543998 ], [ -19976.007525738532, -321.6420633082089, 4.343031231401255, -0.045109338432666846 ], [ -20293.35166715377, -313.1001659511239, 4.2314266035100445, 0.10118426603730768 ], [ -20602.119222235346, -304.34752711417343, 4.701968125237158, 0.3346361373747868 ], [ -20901.43014508691, -367.4760202416019, 8.846158402386209, 3.0438292176149844 ], [ -21257.016177708505, -205.12243441233574, 5.679661209838201, 10.836992863910012 ] ], "kind": "single_phase", "knots": [ 0.07134853354401324, 0.07737907542643173, 0.08742997213400222, 0.0954706895000586, 0.10351140686611499, 0.11155212423217137, 0.11959284159822775, 0.12964373830579823, 0.13567427633034052, 0.1437149936963969, 0.15175571106245328, 0.1597964284285097, 0.16783714579456607, 0.17587786316062246, 0.18391858052667887, 0.19396947723424934, 0.20000000000000515 ], "max_abs_error": 6.066690294930595, "phase": "B4C_D1G", "x_hi": 0.20000000000000515, "x_lo": 0.07134853354401324 }, { "enthalpy": { "intercept": -28926.81819694759, "slope": 28926.81819694759 }, "entropy": { "intercept": -1.9090914558559002, "slope": 1.9090914558559005 }, "intercept": -28357.622579384162, "kind": "two_phase", "left": { "phase": "B4C_D1G", "x": 0.20000000000000515 }, "mu_a_rel": -28357.622579384162, "mu_b_rel": 0.0, "right": { "phase": "GRAPHITE_A9", "x": 1.0 }, "slope": 28357.622579384162, "x_hi": 1.0, "x_lo": 0.20000000000000515 } ], "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": -18.991157636774233, "energy_per_atom": -18.991157636774233, "enthalpy": -16.75899652870716, "entries_at_x": 1, "entropy": 0.007486705041308994, "formula": "", "nsites": null, "phase": "BETA_RHOMBO_B", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.00011381860521009242 }, { "collinear": false, "degenerate": [], "energy": -11711.902610269284, "energy_per_atom": -11711.902610269284, "enthalpy": -12198.225289477856, "entries_at_x": 1, "entropy": -1.6311342586234305, "formula": "", "nsites": null, "phase": "B4C_D1G", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.07134853354401324 }, { "collinear": false, "degenerate": [], "energy": -22686.098063507183, "energy_per_atom": -22686.098063507183, "enthalpy": -23141.454557557925, "entries_at_x": 1, "entropy": -1.5272731646847104, "formula": "", "nsites": null, "phase": "B4C_D1G", "phase_kind": "solution", "spacegroup_number": null, "spacegroup_symbol": "", "theoretical": false, "x": 0.20000000000000515 }, { "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-14Rog", "builder_version": 1, "engine": { "numpy": "2.5.1", "pycalphad": "0.11.2", "python": "3.13.15" }, "fit_tol": 1.0, "observed_at": "2026-09-03T00:17:46Z", "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-14Rog.tdb", "source_sha256": "61f54c7a828b16dd1b5f97b5d6347435c4e3f12f18c2e1fb107711a3f01c50fd" }, "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" }