{
  "counts": {
    "above_hull": 0,
    "entries": 5,
    "intervals": 4,
    "vertices": 5
  },
  "elements": [
    "FE",
    "NB"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "FE": {
          "energy": -8133.4575415638,
          "phase": "BCC_A2"
        },
        "NB": {
          "energy": -10813.900405593073,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "intercept": 0.0,
            "slope": -37676.90219405662
          },
          "entropy": {
            "intercept": 0.0,
            "slope": 11.70283103642572
          },
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2#1",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -41166.10126756696,
          "right": {
            "phase": "C14_LAVES",
            "x": 0.3333333333333333
          },
          "slope": -41166.10126756696,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -8555.951094654021,
            "slope": -12009.048910094563
          },
          "entropy": {
            "intercept": 5.972015605649281,
            "slope": -6.213215780522122
          },
          "intercept": -10336.507547478352,
          "kind": "two_phase",
          "left": {
            "phase": "C14_LAVES",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -10336.507547478352,
          "mu_b_rel": -20493.086172610256,
          "right": {
            "phase": "MU_D85",
            "x": 0.4615384615384588
          },
          "slope": -10156.578625131904,
          "x_hi": 0.4615384615384588,
          "x_lo": 0.3333333333333333
        },
        {
          "enthalpy": {
            "intercept": -26183.16859756984,
            "slope": 26183.255679556605
          },
          "entropy": {
            "intercept": 5.765002321019017,
            "slope": -5.764686997156546
          },
          "intercept": -27902.004039581665,
          "kind": "two_phase",
          "left": {
            "phase": "MU_D85",
            "x": 0.4615384615384588
          },
          "mu_a_rel": -27902.004039581665,
          "mu_b_rel": -0.006931822830665624,
          "right": {
            "phase": "BCC_A2#2",
            "x": 0.9999971846416866
          },
          "slope": 27901.997107758834,
          "x_hi": 0.9999971846416866,
          "x_lo": 0.4615384615384588
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.013366740217304775,
                -0.013371525125291965,
                -0.0004354546765078515,
                0.00044023958449503943
              ]
            ],
            "knots": [
              0.9999971846416866,
              1.0
            ],
            "max_abs_error": 6.313118417071179e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                8.978821403773159e-06,
                -9.153659014382279e-06,
                -1.603475200768085e-05,
                1.620958961828997e-05
              ]
            ],
            "knots": [
              0.9999971846416866,
              1.0
            ],
            "max_abs_error": 2.3244971077596837e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.010689704615259449,
              -0.01064236219262821,
              0.004345307650718902,
              -0.004392650073350142
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9999971846416866,
            1.0
          ],
          "max_abs_error": 0.0006299175925267228,
          "phase": "BCC_A2#2",
          "x_hi": 1.0,
          "x_lo": 0.9999971846416866
        }
      ],
      "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": -13722.033755855653,
          "energy_per_atom": -13722.033755855653,
          "enthalpy": -12558.967398018875,
          "entries_at_x": 1,
          "entropy": 3.9009436788085736,
          "formula": "",
          "nsites": null,
          "phase": "C14_LAVES",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15024.159220616126,
          "energy_per_atom": -15024.159220616126,
          "enthalpy": -14098.58905315917,
          "entries_at_x": 1,
          "entropy": 3.104377553100626,
          "formula": "",
          "nsites": null,
          "phase": "MU_D85",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.4615384615384588
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.08548594234707707,
          "energy_per_atom": -0.08548594234707707,
          "enthalpy": 0.013366740217304775,
          "entries_at_x": 1,
          "entropy": 0.00033155352193148246,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9999971846416866
        },
        {
          "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-90Hua-LB",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:35:38Z",
    "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-90Hua-LB.tdb",
    "source_sha256": "fb4b807d35e4fed62d97ec82f3186c50e9a1bbcb73ad825c05fd65da7ce6eca9"
  },
  "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"
}
