{
  "counts": {
    "above_hull": 0,
    "entries": 6,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "FE",
    "NI"
  ],
  "flags": [
    "has_intermediate_phases",
    "redundant_phase_descriptions",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "FE": {
          "energy": -8133.457535180828,
          "phase": "BCC_A2"
        },
        "NI": {
          "energy": -8883.518822127371,
          "phase": "FCC_A1"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                0.9952124449532809,
                0.0017831997714723435,
                -0.0009138885641457595
              ]
            ],
            "knots": [
              0.0,
              0.00010240793483773921
            ],
            "max_abs_error": 0.00013110395825349785
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                0.00040092343461232857,
                3.5268523212178364e-05,
                -1.7575246597679377e-05
              ]
            ],
            "knots": [
              0.0,
              0.00010240793483773921
            ],
            "max_abs_error": 2.521762830633769e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              0.875677122996281,
              -0.008732110610297772,
              0.004326171323851824
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.00010240793483773921
          ],
          "max_abs_error": 0.0006207596364789514,
          "phase": "BCC_A2",
          "x_hi": 0.00010240793483773921,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 2.863253834029089,
            "slope": -18232.689496443145
          },
          "entropy": {
            "intercept": 0.010454643415695807,
            "slope": -13.305246193108346
          },
          "intercept": -0.25379810035910877,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2",
            "x": 0.00010240793483773921
          },
          "mu_a_rel": -0.25379810035910877,
          "mu_b_rel": -14265.984142068255,
          "right": {
            "phase": "L12_FCC",
            "x": 0.749499384726268
          },
          "slope": -14265.730343967896,
          "x_hi": 0.749499384726268,
          "x_lo": 0.00010240793483773921
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -13662.526305655196,
                -15.681206119412472,
                -0.005430806653306419,
                -3.494628332489924e-06
              ],
              [
                -13678.212946075895,
                -7.846332280302133,
                -4.671459410709304,
                6.2267986730389575
              ],
              [
                -13684.503939093873,
                12.354644483503943,
                -0.0006462122110146851,
                -2.9961192726801755e-06
              ],
              [
                -13672.149943818695,
                24.706686115029143,
                -0.0026154615101390277,
                -4.803737830627597e-06
              ],
              [
                -13647.44587796891,
                24.70144078091397,
                -0.002630799199682343,
                -4.769555385308877e-06
              ],
              [
                -13622.747072756754,
                24.696164874068202,
                -0.0026460616303687345,
                -4.778512082026509e-06
              ],
              [
                -13598.053558722824,
                24.69085841553024,
                -0.002661353259469479,
                -4.788873042116393e-06
              ],
              [
                -13573.36536644943,
                24.685521342550754,
                -0.002676678522362863,
                -4.799531637900145e-06
              ],
              [
                -13548.682526584927,
                24.679769290630837,
                -0.0026919541785517254,
                -4.809978456421504e-06
              ]
            ],
            "knots": [
              0.749499384726268,
              0.7498419218471754,
              0.750013196806481,
              0.7501844717657868,
              0.7505270216843984,
              0.75086957160301,
              0.7512121215216215,
              0.7515546714402331,
              0.7518972213588446,
              0.7522397659435842
            ],
            "max_abs_error": 0.3891748615333199
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -14.641900982143316,
                -0.03307626429879654,
                -0.0007900345765981878,
                -0.0005601538512550949
              ],
              [
                -14.676327434869972,
                -0.01813577668838076,
                -0.011410973589367941,
                0.013528149622666248
              ],
              [
                -14.69234603552505,
                0.025041684861255332,
                -0.002763427442528499,
                0.0007946477714330658
              ],
              [
                -14.669273130334894,
                0.043837542175332096,
                -0.002185480576800611,
                0.00046889919793906276
              ],
              [
                -14.627152169538421,
                0.04087482656853248,
                -0.000879790740316376,
                0.00011046841131375634
              ],
              [
                -14.587046665298892,
                0.03944699203202721,
                -0.0005483625729828454,
                4.886817941717608e-05
              ],
              [
                -14.548099167660432,
                0.038496997290596996,
                -0.00039804398806035646,
                2.749513518589264e-05
              ],
              [
                -14.509972719222706,
                0.03778345431476625,
                -0.0003124561823092606,
                1.7613336537179725e-05
              ],
              [
                -14.472484107753715,
                0.037210835313865494,
                -0.0002572486769906873,
                1.2242258964081931e-05
              ]
            ],
            "knots": [
              0.749499384726268,
              0.7498419218471754,
              0.750013196806481,
              0.7501844717657868,
              0.7505270216843984,
              0.75086957160301,
              0.7512121215216215,
              0.7515546714402331,
              0.7518972213588446,
              0.7522397659435842
            ],
            "max_abs_error": 0.0008901751931347235
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -9297.04352782917,
              -5.819517918584923,
              0.23011800204625743,
              0.16700637629179127
            ],
            [
              -9302.465921369414,
              -2.4391504606305663,
              -1.2692776351449135,
              2.1933808631054994
            ],
            [
              -9303.980968602082,
              4.888466142154826,
              0.8232696797527899,
              -0.2369272291685922
            ],
            [
              -9298.506160009343,
              11.636522915454139,
              0.648985572465719,
              -0.13980709960826232
            ],
            [
              -9286.360458621031,
              12.514611239556928,
              0.259678809857375,
              -0.032940926275129456
            ],
            [
              -9273.61910949789,
              12.935044199637193,
              0.16084823962671635,
              -0.014574826241073424
            ],
            [
              -9260.537791884866,
              13.212978673282654,
              0.11601546194793855,
              -0.008202463549935146
            ],
            [
              -9247.217000213188,
              13.420384438660317,
              0.09048213213143796,
              -0.005256215762056371
            ],
            [
              -9233.711389858156,
              13.585358741768978,
              0.07400673884412079,
              -0.0036548394390525374
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.749499384726268,
            0.7498419218471754,
            0.750013196806481,
            0.7501844717657868,
            0.7505270216843984,
            0.75086957160301,
            0.7512121215216215,
            0.7515546714402331,
            0.7518972213588446,
            0.7522397659435842
          ],
          "max_abs_error": 0.12376912770378112,
          "phase": "L12_FCC",
          "x_hi": 0.7522397659435842,
          "x_lo": 0.749499384726268
        },
        {
          "enthalpy": {
            "intercept": -54607.170155439155,
            "slope": 54614.45480730119
          },
          "entropy": {
            "intercept": -39.555904258445494,
            "slope": 39.5822337035244
          },
          "intercept": -42813.577300783625,
          "kind": "two_phase",
          "left": {
            "phase": "L12_FCC",
            "x": 0.7522397659435842
          },
          "mu_a_rel": -42813.577300783625,
          "mu_b_rel": -0.5654721882456215,
          "right": {
            "phase": "A1_FCC",
            "x": 0.999772398315101
          },
          "slope": 42813.01182859538,
          "x_hi": 0.999772398315101,
          "x_lo": 0.7522397659435842
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -5.145690071951896,
                5.145851611752239,
                0.0021439506595948288,
                -0.0023054904599382198
              ]
            ],
            "knots": [
              0.999772398315101,
              1.0
            ],
            "max_abs_error": 0.00033097694798955857
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.00044487581230361756,
                0.00044941956254298984,
                -2.2418159510925913e-05,
                1.787440927155363e-05
              ]
            ],
            "knots": [
              0.999772398315101,
              1.0
            ],
            "max_abs_error": 2.5654260354443363e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -5.013050348516666,
              5.0118571693526555,
              0.00882792454055803,
              -0.007634745376547514
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.999772398315101,
            1.0
          ],
          "max_abs_error": 0.001095858728827226,
          "phase": "A1_FCC",
          "x_hi": 1.0,
          "x_lo": 0.999772398315101
        }
      ],
      "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": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.7147220838369321,
          "energy_per_atom": -1.7147220838369321,
          "enthalpy": 0.9960817561606073,
          "entries_at_x": 1,
          "entropy": 0.00909208063055189,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.00010240793483773921
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -10692.40991357515,
          "energy_per_atom": -10692.40991357515,
          "enthalpy": -13662.526305655196,
          "entries_at_x": 1,
          "entropy": -9.961819191950529,
          "formula": "",
          "nsites": null,
          "phase": "L12_FCC",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.749499384726268
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -10607.927303501137,
          "energy_per_atom": -10607.927303501137,
          "enthalpy": -13524.005454058455,
          "entries_at_x": 1,
          "entropy": -9.78057404178205,
          "formula": "",
          "nsites": null,
          "phase": "L12_FCC",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7522397659435842
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -10.30978581603813,
          "energy_per_atom": -10.30978581603813,
          "enthalpy": -5.145690071951896,
          "entries_at_x": 1,
          "entropy": 0.017320461995918635,
          "formula": "",
          "nsites": null,
          "phase": "A1_FCC",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.999772398315101
        },
        {
          "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": "A1_FCC",
          "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": "FeNi-00Ans-2SL",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:35:49Z",
    "phase_families": {
      "FCC_A1": "A1_FCC"
    },
    "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/FeNi-00Ans-2SL.tdb",
    "source_sha256": "79b9e2435a00dd13114a6ab484f46b25cd1262873c905b8a75b9ef484682ea7f"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "FE-NI",
  "x_element": "NI"
}