{
  "counts": {
    "above_hull": 0,
    "entries": 6,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "FE",
    "NB"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "FE": {
          "energy": -8133.4575439257305,
          "phase": "BCC_A2"
        },
        "NB": {
          "energy": -10813.900413858799,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "intercept": 0.0,
            "slope": -35807.191995772766
          },
          "entropy": {
            "intercept": 0.0,
            "slope": 14.77574051589646
          },
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2#1",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -40212.57903058731,
          "right": {
            "phase": "C14_LAVES",
            "x": 0.3333046762952634
          },
          "slope": -40212.57903058731,
          "x_hi": 0.3333046762952634,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -11934.704537193387,
                -1.8351315476874681,
                -9.422561110272731e-05,
                0.0001694756092927019
              ]
            ],
            "knots": [
              0.3333046762952634,
              0.3333333332593741
            ],
            "max_abs_error": 2.4313294488820247e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.3672846784715649,
                -0.0024551571633238487,
                0.0006784697194075788,
                -0.0009166719435295427
              ]
            ],
            "knots": [
              0.3333046762952634,
              0.3333333332593741
            ],
            "max_abs_error": 0.00010249449650406861
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -11825.198610307096,
              -1.1031264392670717,
              -0.20237997264164354,
              0.27347521558156207
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.3333046762952634,
            0.3333333332593741
          ],
          "max_abs_error": 0.03058285583028919,
          "phase": "C14_LAVES",
          "x_hi": 0.3333333332593741,
          "x_lo": 0.3333046762952634
        },
        {
          "enthalpy": {
            "intercept": -6037.4399635278505,
            "slope": -17697.298893816318
          },
          "entropy": {
            "intercept": 9.302725029214045,
            "slope": -13.141289430777274
          },
          "intercept": -8811.047430988012,
          "kind": "two_phase",
          "left": {
            "phase": "C14_LAVES",
            "x": 0.3333333332593741
          },
          "mu_a_rel": -8811.047430988012,
          "mu_b_rel": -22590.27088101812,
          "right": {
            "phase": "MU_D85",
            "x": 0.4615384615212318
          },
          "slope": -13779.223450030111,
          "x_hi": 0.4615384615212318,
          "x_lo": 0.3333333332593741
        },
        {
          "enthalpy": {
            "intercept": -26382.7123051237,
            "slope": 26384.1245146203
          },
          "entropy": {
            "intercept": 6.007962936034273,
            "slope": -6.002638228621274
          },
          "intercept": -28173.986454502337,
          "kind": "two_phase",
          "left": {
            "phase": "MU_D85",
            "x": 0.4615384615212318
          },
          "mu_a_rel": -28173.986454502337,
          "mu_b_rel": -0.17535201858481742,
          "right": {
            "phase": "BCC_A2#2",
            "x": 0.9999292779450116
          },
          "slope": 28173.811102483753,
          "x_hi": 0.9999292779450116,
          "x_lo": 0.4615384615212318
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -0.45373000814475595,
                0.45361181716631954,
                0.0007208398466578836,
                -0.0006026488682214781
              ]
            ],
            "knots": [
              0.9999292779450116,
              1.0
            ],
            "max_abs_error": 8.645292102110735e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.00045829136239747704,
                0.00045799074863546934,
                -1.5197731149665494e-05,
                1.549834491167319e-05
              ]
            ],
            "knots": [
              0.9999292779450116,
              1.0
            ],
            "max_abs_error": 2.223626745822215e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -0.31709043844632623,
              0.31706187552577886,
              0.0052520433187771,
              -0.0052234803982297295
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9999292779450116,
            1.0
          ],
          "max_abs_error": 0.0007494272481611275,
          "phase": "BCC_A2#2",
          "x_hi": 1.0,
          "x_lo": 0.9999292779450116
        }
      ],
      "phase_instances": {
        "BCC_A2#1": "BCC_A2",
        "BCC_A2#2": "BCC_A2"
      },
      "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#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -13403.0406367876,
          "energy_per_atom": -13403.0406367876,
          "enthalpy": -11934.704537193387,
          "entries_at_x": 1,
          "entropy": 4.924823409673678,
          "formula": "",
          "nsites": null,
          "phase": "C14_LAVES",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333046762952634
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -13404.121913312281,
          "energy_per_atom": -13404.121913312281,
          "enthalpy": -11936.539593491078,
          "entries_at_x": 1,
          "entropy": 4.922295219926873,
          "formula": "",
          "nsites": null,
          "phase": "C14_LAVES",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333333332593741
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15170.68902307219,
          "energy_per_atom": -15170.68902307219,
          "enthalpy": -14205.424068061231,
          "entries_at_x": 1,
          "entropy": 3.237514522927878,
          "formula": "",
          "nsites": null,
          "phase": "MU_D85",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.4615384615212318
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -2.167861836609518,
          "energy_per_atom": -2.167861836609518,
          "enthalpy": -0.45373000814475595,
          "entries_at_x": 1,
          "entropy": 0.005749226323878531,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9999292779450116
        },
        {
          "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#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": "FeNb-23Pan",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:35:37Z",
    "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/FeNb-23Pan.tdb",
    "source_sha256": "7a7d73baed07c73bf7bf1068fa8c134a2992065aebe83f97716bbaaff3e396c9"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "FE-NB",
  "x_element": "NB"
}
