{
  "counts": {
    "above_hull": 0,
    "entries": 9,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "AL",
    "FE"
  ],
  "flags": [
    "degenerate_boundary_phase",
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "AL": {
          "energy": -8437.646081587609,
          "phase": "FCC_A1"
        },
        "FE": {
          "energy": -8133.457640116311,
          "phase": "B2_BCC"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "intercept": 0.0,
            "slope": -121973.56810056324
          },
          "entropy": {
            "intercept": 0.0,
            "slope": -22.068041432868593
          },
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -115393.98154735345,
          "right": {
            "phase": "AL13FE4",
            "x": 0.23500518136315457
          },
          "slope": -115393.98154735345,
          "x_hi": 0.23500518136315457,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -28664.420492983947,
                -385.13819807801116,
                0.014303615898541011,
                -0.01422782686103119
              ]
            ],
            "knots": [
              0.23500518136315457,
              0.2487072923056675
            ],
            "max_abs_error": 0.0024550427770009264
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -9.719596298028616,
                0.13192484543166486,
                -0.05284312740732827,
                0.0146189313362724
              ],
              [
                -9.625895648668006,
                0.1185996659215163,
                -0.025729601123936185,
                0.004761347270535787
              ],
              [
                -9.528264236599888,
                0.13040028851061228,
                -0.028684073727601928,
                0.004418658218403565
              ],
              [
                -9.422129363598472,
                0.0863099721621694,
                -0.015790329437344028,
                0.0015224696883215788
              ],
              [
                -9.350087251185323,
                0.05929933606102982,
                -0.011156618454875727,
                0.000750800561749615
              ],
              [
                -9.301193733017424,
                0.03924872216833755,
                -0.008828104253513287,
                0.0004389769005537954
              ],
              [
                -9.270334138202045,
                0.02292611372642739,
                -0.007460921377028027,
                0.0002918725500080637
              ],
              [
                -9.254577073302638,
                0.008875115705195875,
                -0.006560355281809708,
                0.00019442151645427145
              ],
              [
                -9.252067891362795,
                -0.0036852346093385487,
                -0.00593458640089981,
                0.00011641527100412184
              ]
            ],
            "knots": [
              0.23500518136315457,
              0.2356474567461479,
              0.23671793562817964,
              0.23843070183943044,
              0.24014346805068126,
              0.24185623426193206,
              0.24356900047318286,
              0.2452817666844337,
              0.2469945328956845,
              0.2487072923056675
            ],
            "max_abs_error": 0.0004331921931726157
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -25766.522856726715,
              -57.386434617443214,
              15.755187571399965,
              -4.358639452819425
            ],
            [
              -25812.512743225572,
              -65.44944913714801,
              7.671283725507649,
              -1.4195960974797828
            ],
            [
              -25871.710504734692,
              -87.02117553684953,
              8.541820648430672,
              -1.3065696023974454
            ],
            [
              -25951.496429225517,
              -73.88114984804997,
              4.717340331568266,
              -0.4583940798183903
            ],
            [
              -26021.118632821817,
              -65.81954872501849,
              3.3174506211643617,
              -0.21722483733076814
            ],
            [
              -26083.837955763007,
              -59.85104285806203,
              2.6351765583958766,
              -0.12710161611085624
            ],
            [
              -26141.180923678774,
              -54.986157518069376,
              2.2420814690121844,
              -0.09714053844799508
            ],
            [
              -26194.022140266286,
              -50.786098102771476,
              1.9575980134533495,
              -0.06242771955217563
            ],
            [
              -26242.913068075148,
              -47.02781452826663,
              1.7419242116003772,
              -0.02217465014760478
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.23500518136315457,
            0.2356474567461479,
            0.23671793562817964,
            0.23843070183943044,
            0.24014346805068126,
            0.24185623426193206,
            0.24356900047318286,
            0.2452817666844337,
            0.2469945328956845,
            0.2487072923056675
          ],
          "max_abs_error": 0.12915640277788043,
          "phase": "AL13FE4",
          "x_hi": 0.2487072923056675,
          "x_lo": 0.23500518136315457
        },
        {
          "enthalpy": {
            "intercept": -22709.054798465648,
            "slope": -25493.839597652965
          },
          "entropy": {
            "intercept": -6.85690522515598,
            "slope": 9.082979756965619
          },
          "intercept": -20664.668505585374,
          "kind": "two_phase",
          "left": {
            "phase": "AL13FE4",
            "x": 0.2487072923056675
          },
          "mu_a_rel": -20664.668505585374,
          "mu_b_rel": -48866.59851777773,
          "right": {
            "phase": "AL5FE2",
            "x": 0.2857142857142857
          },
          "slope": -28201.930012192355,
          "x_hi": 0.2857142857142857,
          "x_lo": 0.2487072923056675
        },
        {
          "enthalpy": {
            "intercept": -29197.999878045674,
            "slope": -2782.531819122869
          },
          "entropy": {
            "intercept": -9.377999976978504,
            "slope": 17.90681138834445
          },
          "intercept": -26401.949184909547,
          "kind": "two_phase",
          "left": {
            "phase": "AL5FE2",
            "x": 0.2857142857142857
          },
          "mu_a_rel": -26401.949184909547,
          "mu_b_rel": -34523.39681946729,
          "right": {
            "phase": "AL2FE",
            "x": 0.3333333333333333
          },
          "slope": -8121.447634557746,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.2857142857142857
        },
        {
          "enthalpy": {
            "intercept": -28294.421793096073,
            "slope": -5493.266073971671
          },
          "entropy": {
            "intercept": 2.326403648288708,
            "slope": -17.206399487457187
          },
          "intercept": -28988.039040833373,
          "kind": "two_phase",
          "left": {
            "phase": "AL2FE",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -28988.039040833373,
          "mu_b_rel": -29351.217107619643,
          "right": {
            "phase": "B2_BCC#1",
            "x": 0.5002079056259349
          },
          "slope": -363.17806678627016,
          "x_hi": 0.5002079056259349,
          "x_lo": 0.3333333333333333
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -31042.196911003444,
                359.366762495114,
                40.50383039334935,
                -0.019909201585107894
              ],
              [
                -30642.346227316575,
                733.8578306060915,
                112.34709936346587,
                -0.039901386208271106
              ],
              [
                -29796.18119873323,
                575.0597075504731,
                40.38763381687113,
                -0.007624498140103242
              ],
              [
                -29180.74148186403,
                1093.0207482151413,
                112.08341531926612,
                -0.06972808717159751
              ],
              [
                -27975.707046416792,
                790.1874171208674,
                40.25105556403844,
                -0.012478197406494473
              ],
              [
                -27145.281051929294,
                1451.0874815687807,
                111.63728172780475,
                -0.10521368701529354
              ],
              [
                -25582.661502319723,
                1004.4281716293452,
                40.042431861717205,
                -0.01750349329290657
              ],
              [
                -24538.208402321943,
                1807.4347469948455,
                110.98867133708268,
                -0.1361244493848517
              ],
              [
                -22619.921108439412,
                2029.0039131866681,
                110.496110991156,
                -0.14199026409505677
              ],
              [
                -20480.56307452567,
                1349.741669666899,
                39.58860726550233,
                -0.017895709538834126
              ],
              [
                -19091.25069330281,
                1905.1521343078143,
                70.21986481606018,
                -0.034820561396372796
              ],
              [
                -17115.913514740336,
                2045.483926573793,
                70.09732681250125,
                0.021584935643204517
              ],
              [
                -15000.310676418394,
                2185.736855145838,
                70.22087671000008,
                0.12538938367106311
              ],
              [
                -12744.227555178886,
                2326.545232960519,
                70.7874462393429,
                0.2764474010855338
              ],
              [
                -10346.618428577942,
                3086.173800873989,
                112.36801966723715,
                1.0010280438114023
              ],
              [
                -7147.075579992904,
                1988.3433447416658,
                9.32807009435055,
                54.43163011699107
              ]
            ],
            "knots": [
              0.5002079056259349,
              0.5212521912442657,
              0.5563259917466248,
              0.5773702720480403,
              0.6124440725503993,
              0.6334883528518148,
              0.6685621533541739,
              0.6896064336555894,
              0.7246802341579485,
              0.7597540346603076,
              0.780798314961723,
              0.8088573553636103,
              0.8369163957654976,
              0.8649754361673849,
              0.8930344765692722,
              0.9281082770716312,
              0.9491525573730467
            ],
            "max_abs_error": 1.6127890405032304
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -12.043519005558244,
                0.8783265411243707,
                -0.37810670247521827,
                0.11027559384424634
              ],
              [
                -11.433023573064844,
                0.768447503015811,
                -0.13495862187660457,
                0.036007583205078575
              ],
              [
                -10.76352710872056,
                0.4857046058994566,
                -0.0173000896461456,
                0.004486859786603126
              ],
              [
                -10.290635732680647,
                0.46469863151799184,
                -0.0011487607615999207,
                0.0022030426756865507
              ],
              [
                -9.824882819248565,
                0.5863319049333887,
                0.010870693293220768,
                0.0026596456414971215
              ],
              [
                -9.225020575380459,
                0.36964916000002546,
                0.0072309284448977,
                0.00024704761581517687
              ],
              [
                -8.847893439319725,
                0.6414395922930607,
                0.02338976399959325,
                0.0012186616573997
              ],
              [
                -8.181845421369667,
                0.41513104960221864,
                0.009978871305351078,
                0.00013042930930556862
              ],
              [
                -7.7566050711527925,
                0.7258063268200471,
                0.02946923226214293,
                0.0007589929873340617
              ],
              [
                -7.000570519083269,
                0.47221289268012095,
                0.011621389669365434,
                0.0001065240774430487
              ],
              [
                -6.51662971265634,
                0.661028914183797,
                0.021626999428039917,
                0.00041669229431240407
              ],
              [
                -5.833557106750192,
                0.7055185258427529,
                0.023355007995288335,
                0.0006530280377480269
              ],
              [
                -5.104030544874403,
                0.7541569602789069,
                0.026124938179865165,
                0.0011498870206296807
              ],
              [
                -4.322598759395002,
                0.8098012777655874,
                0.031036582800465617,
                0.0020425941298970463
              ],
              [
                -3.4797183046990505,
                1.0973856846473822,
                0.061004439551772593,
                0.008446417796576844
              ],
              [
                -2.312881762703319,
                0.74666146172816,
                -0.06833733391483832,
                0.17436404635773628
              ]
            ],
            "knots": [
              0.5002079056259349,
              0.5212521912442657,
              0.5563259917466248,
              0.584385032148512,
              0.6124440725503993,
              0.6475178730527584,
              0.6685621533541739,
              0.703635953856533,
              0.7246802341579485,
              0.7597540346603076,
              0.780798314961723,
              0.8088573553636103,
              0.8369163957654976,
              0.8649754361673849,
              0.8930344765692722,
              0.9281082770716312,
              0.9491525573730467
            ],
            "max_abs_error": 0.005166342114303557
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -27451.421719496255,
              97.49370425880707,
              153.2363437365159,
              -32.898577506358606
            ],
            [
              -27233.5902490073,
              504.74520758196473,
              152.5850124758848,
              -10.775562318759853
            ],
            [
              -26587.0355912682,
              1243.866896970194,
              306.62365187567275,
              -9.873191435488934
            ],
            [
              -25046.41823385783,
              1827.4626737261453,
              277.8520114220323,
              -3.5585246768991965
            ],
            [
              -22944.66207338655,
              2372.4827812374565,
              266.98248786304885,
              -2.0925021891553115
            ],
            [
              -20307.289306475206,
              2900.1676109523855,
              260.4472427756905,
              -1.6430917271923136
            ],
            [
              -17148.317544474317,
              3416.1327270877846,
              255.29068219567307,
              -1.6498342732393212
            ],
            [
              -13478.543969464097,
              3921.7699148775237,
              250.3246224750501,
              -2.6909839204008676
            ],
            [
              -9309.140416031923,
              2758.9882589963877,
              94.17954601483189,
              -1.5172714222030663
            ],
            [
              -6457.489882442908,
              1765.7262299273946,
              29.702846201119655,
              2.444989695394497
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.5002079056259349,
            0.5212521912442657,
            0.5563259917466248,
            0.6124440725503993,
            0.6685621533541739,
            0.7246802341579485,
            0.780798314961723,
            0.8369163957654976,
            0.8930344765692722,
            0.9281082770716312,
            0.9491525573730467
          ],
          "max_abs_error": 0.9747737012330617,
          "phase": "B2_BCC#1",
          "x_hi": 0.9491525573730467,
          "x_lo": 0.5002079056259349
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -5094.972535039898,
                4000.609373813546,
                205.09392690591721,
                -0.63295608919816
              ]
            ],
            "knots": [
              0.9491525573730467,
              0.991525421142578
            ],
            "max_abs_error": 0.0007411856449834886
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -1.460193588532262,
                1.1415328082300031,
                0.0628780543757177,
                -0.00011016154975362902
              ]
            ],
            "knots": [
              0.9491525573730467,
              0.991525421142578
            ],
            "max_abs_error": 3.449330021609853e-08
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -4659.615816619002,
              3660.261367039468,
              186.34683499427,
              -0.6001114233131375
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9491525573730467,
            0.991525421142578
          ],
          "max_abs_error": 0.0007490368493563437,
          "phase": "B2_BCC#1",
          "x_hi": 0.991525421142578,
          "x_lo": 0.9491525573730467
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -889.9021904096325,
                881.7802460678399,
                8.137184021884423,
                -0.015239680092008712
              ]
            ],
            "knots": [
              0.991525421142578,
              1.0
            ],
            "max_abs_error": 0.0014297171741759485
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.2558928874762948,
                0.2533918575854333,
                0.0024888967969817766,
                1.2133093879707069e-05
              ]
            ],
            "knots": [
              0.991525421142578,
              1.0
            ],
            "max_abs_error": 1.9025760413793336e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -813.6077260085765,
              806.2314637294269,
              7.395119440431017,
              -0.018857161281630397
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.991525421142578,
            1.0
          ],
          "max_abs_error": 0.001996970262666764,
          "phase": "BCC_A2",
          "x_hi": 1.0,
          "x_lo": 0.991525421142578
        }
      ],
      "phase_instances": {
        "B2_BCC#1": "B2_BCC",
        "B2_BCC#2": "B2_BCC"
      },
      "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": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -27118.18356175231,
          "energy_per_atom": -27118.18356175231,
          "enthalpy": -28664.420492983947,
          "entries_at_x": 1,
          "entropy": -5.186104079260893,
          "formula": "",
          "nsites": null,
          "phase": "AL13FE4",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.23500518136315457
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -27678.694156711674,
          "energy_per_atom": -27678.694156711674,
          "enthalpy": -29049.558615272923,
          "entries_at_x": 1,
          "entropy": -4.597901923733872,
          "formula": "",
          "nsites": null,
          "phase": "AL13FE4",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2487072923056675
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -28722.36279478319,
          "energy_per_atom": -28722.36279478319,
          "enthalpy": -29993.008969223636,
          "entries_at_x": 1,
          "entropy": -4.261768151737233,
          "formula": "",
          "nsites": null,
          "phase": "AL5FE2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2857142857142857
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -29109.098396428795,
          "energy_per_atom": -29109.098396428795,
          "enthalpy": -30125.510484419963,
          "entries_at_x": 1,
          "entropy": -3.409062847530354,
          "formula": "",
          "nsites": null,
          "phase": "AL2FE",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -29169.703580989808,
          "energy_per_atom": -29169.703580989808,
          "enthalpy": -31042.196911003444,
          "entries_at_x": 1,
          "entropy": -6.28037340269541,
          "formula": "",
          "nsites": null,
          "phase": "B2_BCC#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.5002079056259349
        },
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": -5157.893534637601,
              "phase": "BCC_A2"
            }
          ],
          "energy": -5157.893534637601,
          "energy_per_atom": -5157.893534637601,
          "enthalpy": -5094.972535039898,
          "entries_at_x": 1,
          "entropy": 0.21103806673723113,
          "formula": "",
          "nsites": null,
          "phase": "B2_BCC#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9491525573730467
        },
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": -934.7496663818811,
              "phase": "B2_BCC"
            }
          ],
          "energy": -934.7496663818811,
          "energy_per_atom": -934.7496663818811,
          "enthalpy": -889.9021904096325,
          "entries_at_x": 1,
          "entropy": 0.15041917146485773,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.991525421142578
        },
        {
          "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": "B2_BCC#2",
          "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": "AlFe-07Zha",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:10:04Z",
    "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/AlFe-07Zha.tdb",
    "source_sha256": "64a98b3da69234a790b1faf937696b4ffd70dbf885a4c9dda2af0fd121d35938"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "AL-FE",
  "x_element": "FE"
}