{
  "counts": {
    "above_hull": 0,
    "entries": 4,
    "intervals": 3,
    "vertices": 4
  },
  "elements": [
    "NI",
    "PB"
  ],
  "flags": [
    "miscibility_gap",
    "no_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "NI": {
          "energy": -8883.518786229373,
          "phase": "FCC_A1"
        },
        "PB": {
          "energy": -19320.12040120976,
          "phase": "FCC_A1"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                5.218245008566072,
                0.002871700142567768,
                -0.0009721097460113626
              ]
            ],
            "knots": [
              0.0,
              0.000505529976002558
            ],
            "max_abs_error": 0.00013921291601559638
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -0.01442814671789563,
                4.517092972858294e-05,
                -1.751575820579769e-05
              ]
            ],
            "knots": [
              0.0,
              0.000505529976002558
            ],
            "max_abs_error": 2.514988481194802e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              9.519996952411862,
              -0.010596012488036877,
              0.004250213591678431
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.000505529976002558
          ],
          "max_abs_error": 0.000610630877465379,
          "phase": "FCC_A1#1",
          "x_hi": 0.000505529976002558,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 5.222669113084242,
            "slope": -4.9937970871235295
          },
          "entropy": {
            "intercept": 0.02171416227354869,
            "slope": -0.02086631759577356
          },
          "intercept": -1.2514083687724844,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1#1",
            "x": 0.000505529976002558
          },
          "mu_a_rel": -1.2514083687724844,
          "mu_b_rel": -0.02391286471806553,
          "right": {
            "phase": "FCC_A1#2",
            "x": 0.9999903463418486
          },
          "slope": 1.2274955040544189,
          "x_hi": 0.9999903463418486,
          "x_lo": 0.000505529976002558
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.228920234370669,
                -0.2289406708594193,
                -0.0021967007081536427,
                0.0022171371969039455
              ]
            ],
            "knots": [
              0.9999903463418486,
              1.0
            ],
            "max_abs_error": 0.00031801158778251015
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.00015913240190900757,
                0.00015900262755436944,
                -1.1941899803845216e-05,
                1.2071674158483351e-05
              ]
            ],
            "knots": [
              0.9999903463418486,
              1.0
            ],
            "max_abs_error": 1.7315285423895977e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.27636555999971607,
              -0.2763473037095293,
              0.0013637764350197812,
              -0.0013820327252064835
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9999903463418486,
            1.0
          ],
          "max_abs_error": 0.00019824381613953168,
          "phase": "FCC_A1#2",
          "x_hi": 1.0,
          "x_lo": 0.9999903463418486
        }
      ],
      "phase_instances": {
        "FCC_A1#1": "FCC_A1",
        "FCC_A1#2": "FCC_A1"
      },
      "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#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.2507878329997766,
          "energy_per_atom": -1.2507878329997766,
          "enthalpy": 5.220144598962627,
          "entries_at_x": 1,
          "entropy": 0.021703613724515236,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.000505529976002558
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.02392471454004408,
          "energy_per_atom": -0.02392471454004408,
          "enthalpy": 0.228920234370669,
          "entries_at_x": 1,
          "entropy": 0.0008480461140720763,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9999903463418486
        },
        {
          "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#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": "NiPb-99Gho",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:52:45Z",
    "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/NiPb-99Gho.tdb",
    "source_sha256": "76b83859e1d1c4ef80573bcb295d5757f3bd377c1226ba2d80086088ad849659"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "NI-PB",
  "x_element": "PB"
}