{
  "counts": {
    "above_hull": 0,
    "entries": 9,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "AL",
    "NB"
  ],
  "flags": [
    "has_intermediate_phases",
    "redundant_phase_descriptions",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "AL": {
          "energy": -8437.646129291592,
          "phase": "FCC_A1"
        },
        "NB": {
          "energy": -10813.900484400383,
          "phase": "B2_BCC"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "intercept": 0.0,
            "slope": -170988.69936045798
          },
          "entropy": {
            "intercept": 0.0,
            "slope": -36.085999891733366
          },
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -160229.6584927377,
          "right": {
            "phase": "AL3NB_D022",
            "x": 0.25000000000000316
          },
          "slope": -160229.6584927377,
          "x_hi": 0.25000000000000316,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -42747.17484011503,
                9.367130833895203,
                0.004184115577240632,
                -0.001099095156982699
              ]
            ],
            "knots": [
              0.25000000000000316,
              0.2502003237424432
            ],
            "max_abs_error": 0.00015767494187457487
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -13.697014511740361,
                0.01835100898611377,
                -0.014486519172777327,
                0.006411508462676244
              ]
            ],
            "knots": [
              0.25000000000000316,
              0.2502003237424432
            ],
            "max_abs_error": 0.0007169862258411541
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -38663.409963439655,
              3.8957775055831725,
              4.323339804800016,
              -1.9126903420223602
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.25000000000000316,
            0.2502003237424432
          ],
          "max_abs_error": 0.2139258755996707,
          "phase": "AL3NB_D022",
          "x_hi": 0.2502003237424432,
          "x_lo": 0.25000000000000316
        },
        {
          "enthalpy": {
            "intercept": -51689.454936567185,
            "slope": 35777.93257182727
          },
          "entropy": {
            "intercept": -12.812503953670431,
            "slope": 15.200255794558583
          },
          "intercept": -47869.40688278036,
          "kind": "two_phase",
          "left": {
            "phase": "AL3NB_D022",
            "x": 0.2502003237424432
          },
          "mu_a_rel": -47869.40688278036,
          "mu_b_rel": -16623.43057610073,
          "right": {
            "phase": "SIGMA_D8B",
            "x": 0.6666666666759189
          },
          "slope": 31245.976306679626,
          "x_hi": 0.6666666666759189,
          "x_lo": 0.2502003237424432
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -27837.499888351318,
                156.5477320178108,
                0.00016441500704900136,
                -8.177327620728647e-05
              ]
            ],
            "knots": [
              0.6666666666759189,
              0.6683588468211629
            ],
            "max_abs_error": 1.1730011465260759e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -7.971273348649538,
                0.09001076605380892,
                -0.051473972304358045,
                0.02222061021017166
              ],
              [
                -7.910515944689913,
                0.053724892640971515,
                -0.0032669497680464926,
                0.0005560820294077812
              ]
            ],
            "knots": [
              0.6666666666759189,
              0.6675127565480985,
              0.6683588468211629
            ],
            "max_abs_error": 0.0023168393371886253
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -25460.864739451463,
              51.43713756693647,
              15.347045741101923,
              -6.625114947891873
            ],
            [
              -25400.705671091306,
              62.25584956827627,
              0.9740410740870757,
              -0.16579585815831166
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.6666666666759189,
            0.6675127565480985,
            0.6683588468211629
          ],
          "max_abs_error": 0.6907711696621845,
          "phase": "SIGMA_D8B",
          "x_hi": 0.6683588468211629,
          "x_lo": 0.6666666666759189
        },
        {
          "enthalpy": {
            "intercept": -82401.55765314298,
            "slope": 81873.0923361192
          },
          "entropy": {
            "intercept": -13.428830043363408,
            "slope": 16.236480653350274
          },
          "intercept": -78397.75197571419,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_D8B",
            "x": 0.6683588468211629
          },
          "mu_a_rel": -78397.75197571419,
          "mu_b_rel": -1365.5663463913806,
          "right": {
            "phase": "ALNB3_A15",
            "x": 0.8303595041146841
          },
          "slope": 77032.1856293228,
          "x_hi": 0.8303595041146841,
          "x_lo": 0.6683588468211629
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -14417.457300587314,
                1492.2044036228256,
                84.0204106676365,
                0.0011471832576717134
              ]
            ],
            "knots": [
              0.8303595041146841,
              0.849880816717144
            ],
            "max_abs_error": 0.0002783416748570744
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -3.732419513468863,
                0.21898215304001828,
                0.017342045428235864,
                0.001262536315602858
              ]
            ],
            "knots": [
              0.8303595041146841,
              0.849880816717144
            ],
            "max_abs_error": 8.641028259592787e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -13304.636422646572,
              1426.9148746937215,
              78.84987982370126,
              -0.37527801951341644
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.8303595041146841,
            0.849880816717144
          ],
          "max_abs_error": 0.00243426949964487,
          "phase": "ALNB3_A15",
          "x_hi": 0.849880816717144,
          "x_lo": 0.8303595041146841
        },
        {
          "enthalpy": {
            "intercept": -85880.09776146954,
            "slope": 85940.12829291172
          },
          "entropy": {
            "intercept": -1.479462340712741,
            "slope": 1.7660675150263159
          },
          "intercept": -85438.99606458604,
          "kind": "two_phase",
          "left": {
            "phase": "ALNB3_A15",
            "x": 0.849880816717144
          },
          "mu_a_rel": -85438.99606458604,
          "mu_b_rel": -25.420801279411535,
          "right": {
            "phase": "B2_BCC",
            "x": 0.9917465295254314
          },
          "slope": 85413.57526330663,
          "x_hi": 0.9917465295254314,
          "x_lo": 0.849880816717144
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -649.2737800040087,
                643.9879507568756,
                5.300018492973777,
                -0.014189245840611875
              ]
            ],
            "knots": [
              0.9917465295254314,
              1.0
            ],
            "max_abs_error": 0.0010692221645740574
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.12550390426616348,
                0.12412899104994896,
                0.0013613178784563917,
                1.3595337758132153e-05
              ]
            ],
            "knots": [
              0.9917465295254314,
              1.0
            ],
            "max_abs_error": 1.9885778150541267e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -611.8547909470485,
              606.9788920755668,
              4.894141566939652,
              -0.01824269545795687
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9917465295254314,
            1.0
          ],
          "max_abs_error": 0.0016621166434163115,
          "phase": "B2_BCC",
          "x_hi": 1.0,
          "x_lo": 0.9917465295254314
        }
      ],
      "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": -40057.41462318494,
          "energy_per_atom": -40057.41462318494,
          "enthalpy": -42747.17484011503,
          "entries_at_x": 1,
          "entropy": -9.021499972933455,
          "formula": "",
          "nsites": null,
          "phase": "AL3NB_D022",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.25000000000000316
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -40051.6534952004,
          "energy_per_atom": -40051.6534952004,
          "enthalpy": -42737.8046242607,
          "entries_at_x": 1,
          "entropy": -9.009395032903925,
          "formula": "",
          "nsites": null,
          "phase": "AL3NB_D022",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2502003237424432
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -27038.756011371508,
          "energy_per_atom": -27038.756011371508,
          "enthalpy": -27837.499888351318,
          "entries_at_x": 1,
          "entropy": -2.6790000904907387,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666666666759189
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -26912.60922038624,
          "energy_per_atom": -26912.60922038624,
          "enthalpy": -27680.952073691777,
          "entries_at_x": 1,
          "entropy": -2.5770345574560984,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6683588468211629
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -14433.344515679408,
          "energy_per_atom": -14433.344515679408,
          "enthalpy": -14417.457300587314,
          "entries_at_x": 1,
          "entropy": 0.05328598052018663,
          "formula": "",
          "nsites": null,
          "phase": "ALNB3_A15",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.8303595041146841
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -12847.636961075757,
          "energy_per_atom": -12847.636961075757,
          "enthalpy": -12841.231339113598,
          "entries_at_x": 1,
          "entropy": 0.0214845613354413,
          "formula": "",
          "nsites": null,
          "phase": "ALNB3_A15",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.849880816717144
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -730.3792228424572,
          "energy_per_atom": -730.3792228424572,
          "enthalpy": -649.2737800040087,
          "entries_at_x": 1,
          "entropy": 0.27202898822221044,
          "formula": "",
          "nsites": null,
          "phase": "B2_BCC",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9917465295254314
        },
        {
          "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",
          "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": "AlNb-09Wit",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:12:13Z",
    "phase_families": {
      "BCC_A2": "A2_BCC"
    },
    "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/AlNb-09Wit.tdb",
    "source_sha256": "4dcb4c37be340beecd788f6e4540d9c11a4a5dc46ef7edb1d4a0e11137471286"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "AL-NB",
  "x_element": "NB"
}