{
  "counts": {
    "above_hull": 0,
    "entries": 6,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "NB",
    "NI"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "NB": {
          "energy": -10813.900432110127,
          "phase": "BCC_A2"
        },
        "NI": {
          "energy": -8883.51893661433,
          "phase": "FCC_A1"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -2.8532161124496227,
                -0.0038161745099136724,
                0.0021560004751677297
              ]
            ],
            "knots": [
              0.0,
              0.00012444162668359769
            ],
            "max_abs_error": 0.00030929381031097325
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -0.00041664322633859057,
                3.240595418681387e-05,
                -1.60424139844405e-05
              ]
            ],
            "knots": [
              0.0,
              0.00012444162668359769
            ],
            "max_abs_error": 2.3019759250135355e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -2.7289939344137193,
              -0.013478009771688004,
              0.006939046120455039
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.00012444162668359769
          ],
          "max_abs_error": 0.000995627959256784,
          "phase": "BCC_A2",
          "x_hi": 0.00012444162668359769,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 2.7737326825914175,
            "slope": -45230.917652554905
          },
          "entropy": {
            "intercept": 0.01033921651490604,
            "slope": -3.226596079264856
          },
          "intercept": -0.3089047213299141,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2",
            "x": 0.00012444162668359769
          },
          "mu_a_rel": -0.3089047213299141,
          "mu_b_rel": -44269.21693624342,
          "right": {
            "phase": "NBNI3_D0A",
            "x": 0.7499643071018259
          },
          "slope": -44268.90803152209,
          "x_hi": 0.7499643071018259,
          "x_lo": 0.00012444162668359769
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -33918.80008419549,
                -13.462522314584929,
                33.6107890993153,
                -12.867809781600958
              ],
              [
                -33911.519627192356,
                15.15562653839879,
                0.0004981622041668743,
                -3.2014213502407074e-10
              ],
              [
                -33896.36350249208,
                30.31324572379308,
                0.001992645384600422,
                -4.0963854530673416e-10
              ],
              [
                -33866.04826412331,
                30.31723101367243,
                0.0019926450186176226,
                -1.4551915228366852e-10
              ],
              [
                -33835.729040464765,
                30.32121630333131,
                0.001992645120484582,
                -3.929052638795838e-10
              ],
              [
                -33805.4058315167,
                30.325201592592286,
                0.001992645122680159,
                -2.3502977342104714e-10
              ],
              [
                -33775.07863727923,
                30.329186882445352,
                0.001992644160058177,
                3.346904975387588e-10
              ],
              [
                -33744.747457752295,
                30.33317217127259,
                0.00199264504991703,
                -7.495515319533297e-11
              ],
              [
                -33714.41229293604,
                30.337157460715392,
                0.001992645586149422,
                -6.111875450187654e-10
              ]
            ],
            "knots": [
              0.7499643071018259,
              0.7500648557015007,
              0.7501654043011755,
              0.750366501500525,
              0.7505675986998745,
              0.7507686958992241,
              0.7509697930985736,
              0.7511708902979232,
              0.7513719874972726,
              0.7515730846966222
            ],
            "max_abs_error": 0.3601916198094841
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -7.085333219096642,
                -0.027440959606373383,
                0.07722341858906745,
                -0.03613595913658507
              ],
              [
                -7.0716867192505335,
                0.01860415502578089,
                -0.0009029369235140708,
                0.00016119185265251607
              ],
              [
                -7.053824309295616,
                0.017282401331105035,
                -0.0004392583321681798,
                4.96023256868483e-05
              ],
              [
                -7.03693156397099,
                0.016552837449506086,
                -0.00028903509765854096,
                2.3941288828766005e-05
              ],
              [
                -7.0206438203303145,
                0.016046649714874534,
                -0.00021508248563352136,
                1.4078134054306551e-05
              ],
              [
                -7.0047981749670205,
                0.015658748302190162,
                -0.0001711593052284889,
                9.263488646386181e-06
              ],
              [
                -6.9893013224814124,
                0.015344236716627845,
                -0.00014208692962347502,
                6.556317134198686e-06
              ],
              [
                -6.974092616377273,
                0.0150797420990898,
                -0.00012143200733660646,
                4.88390702102319e-06
              ]
            ],
            "knots": [
              0.7499643071018259,
              0.7501654043011755,
              0.750366501500525,
              0.7505675986998745,
              0.7507686958992241,
              0.7509697930985736,
              0.7511708902979232,
              0.7513719874972726,
              0.7515730846966222
            ],
            "max_abs_error": 0.0029397154527366354
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -31806.307984921837,
              -9.371761261201756,
              24.823435302103462,
              -9.36623068267363
            ],
            [
              -31800.222541563617,
              12.15509593401657,
              0.1529853925749194,
              -0.025646910522482358
            ],
            [
              -31787.94010714755,
              24.766416903062208,
              0.2712032888660154,
              -0.04805935121046545
            ],
            [
              -31762.95054630683,
              25.1644830567966,
              0.13295751667465439,
              -0.014788933469393584
            ],
            [
              -31737.667894666818,
              25.385987817688147,
              0.08816845966794418,
              -0.007138095752456053
            ],
            [
              -31712.20087648522,
              25.540892980187547,
              0.0661194878917506,
              -0.004197395653658731
            ],
            [
              -31686.598061412802,
              25.6605310759187,
              0.05302379131899215,
              -0.0027619088941719383
            ],
            [
              -31660.88726845446,
              25.75828799426414,
              0.04435586305015349,
              -0.0019547660264684907
            ],
            [
              -31635.08657936316,
              25.841132353947618,
              0.03819759855105076,
              -0.0014561375355697237
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.7499643071018259,
            0.7500648557015007,
            0.7501654043011755,
            0.750366501500525,
            0.7505675986998745,
            0.7507686958992241,
            0.7509697930985736,
            0.7511708902979232,
            0.7513719874972726,
            0.7515730846966222
          ],
          "max_abs_error": 0.26661658478042227,
          "phase": "NBNI3_D0A",
          "x_hi": 0.7515730846966222,
          "x_lo": 0.7499643071018259
        },
        {
          "enthalpy": {
            "intercept": -135635.87505308748,
            "slope": 135651.21474701384
          },
          "entropy": {
            "intercept": -12.502947436179,
            "slope": 13.578065364477895
          },
          "intercept": -131908.12127499073,
          "kind": "two_phase",
          "left": {
            "phase": "NBNI3_D0A",
            "x": 0.7515730846966222
          },
          "mu_a_rel": -131908.12127499073,
          "mu_b_rel": -305.20671639594366,
          "right": {
            "phase": "FCC_A1",
            "x": 0.9725033202256717
          },
          "slope": 131602.91455859478,
          "x_hi": 0.9725033202256717,
          "x_lo": 0.7515730846966222
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -3714.618318970917,
                3459.3935933677108,
                252.04336077089374,
                3.1813648323118286
              ]
            ],
            "knots": [
              0.9725033202256717,
              1.0
            ],
            "max_abs_error": 0.002535384377097216
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.3452713735544013,
                0.2810957352630764,
                0.06564689073265406,
                -0.0014712524413291739
              ]
            ],
            "knots": [
              0.9725033202256717,
              1.0
            ],
            "max_abs_error": 1.9532254023096884e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -3611.675658945673,
              3375.584899899182,
              232.4707402983754,
              3.6200187481163084
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9725033202256717,
            1.0
          ],
          "max_abs_error": 0.003764595440316043,
          "phase": "FCC_A1",
          "x_hi": 1.0,
          "x_lo": 0.9725033202256717
        }
      ],
      "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": -5.817799648279106,
          "energy_per_atom": -5.817799648279106,
          "enthalpy": -2.854876286484368,
          "entries_at_x": 1,
          "entropy": 0.009937693650151402,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.00012444162668359769
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -33200.409842736255,
          "energy_per_atom": -33200.409842736255,
          "enthalpy": -33918.80008419549,
          "entries_at_x": 1,
          "entropy": -2.40949267636843,
          "formula": "",
          "nsites": null,
          "phase": "NBNI3_D0A",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7499643071018259
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -32998.91282512164,
          "energy_per_atom": -32998.91282512164,
          "enthalpy": -33684.07314283035,
          "entries_at_x": 1,
          "entropy": -2.298038965985981,
          "formula": "",
          "nsites": null,
          "phase": "NBNI3_D0A",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7515730846966222
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -3923.849915381921,
          "energy_per_atom": -3923.849915381921,
          "enthalpy": -3714.618318970917,
          "entries_at_x": 1,
          "entropy": 0.7017662130169491,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9725033202256717
        },
        {
          "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": 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": "NbNi-05Mat",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:50:59Z",
    "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/NbNi-05Mat.tdb",
    "source_sha256": "9c972291ac3457c6e68f0f95cceab7c204f4c462fcc9227bfd3cb1afdd35a9a8"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "NB-NI",
  "x_element": "NI"
}