{
  "counts": {
    "above_hull": 0,
    "entries": 9,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "NI",
    "TA"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "NI": {
          "energy": -8883.518858679055,
          "phase": "FCC_A1"
        },
        "TA": {
          "energy": -12364.820187285699,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "intercept": 0.0,
            "slope": -100842.74925582758
          },
          "entropy": {
            "intercept": 0.0,
            "slope": 7.989559394531233
          },
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -103224.83638930708,
          "right": {
            "phase": "NI3TA",
            "x": 0.2499998122192772
          },
          "slope": -103224.83638930708,
          "x_hi": 0.2499998122192772,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -3394.7853133128156,
            "slope": -87263.59780296482
          },
          "entropy": {
            "intercept": 14.548217095400966,
            "slope": -50.20335269710101
          },
          "intercept": -7732.336240306588,
          "kind": "two_phase",
          "left": {
            "phase": "NI3TA",
            "x": 0.2499998122192772
          },
          "mu_a_rel": -7732.336240306588,
          "mu_b_rel": -80027.80443663085,
          "right": {
            "phase": "NI2TA_C11B",
            "x": 0.3333333333183449
          },
          "slope": -72295.46819632426,
          "x_hi": 0.3333333333183449,
          "x_lo": 0.2499998122192772
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -32482.65124632648,
                0.6997083404082957,
                0.000556826916411346,
                -0.0002762600172472318
              ]
            ],
            "knots": [
              0.3333333333183449,
              0.33334536762962313
            ],
            "max_abs_error": 3.963189374189824e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -7.478507061005976,
                0.0016479992138439465,
                -0.0008698555168226742,
                0.00038489743099140786
              ]
            ],
            "knots": [
              0.3333333333183449,
              0.33334536762962313
            ],
            "max_abs_error": 4.303396567717499e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -30252.934366087557,
              0.2083573761484776,
              0.2599042464836587,
              -0.11503342764366814
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.3333333333183449,
            0.33334536762962313
          ],
          "max_abs_error": 0.012869896298070671,
          "phase": "NI2TA_C11B",
          "x_hi": 0.33334536762962313,
          "x_lo": 0.3333333333183449
        },
        {
          "enthalpy": {
            "intercept": -43762.78015420477,
            "slope": 33841.26492293003
          },
          "entropy": {
            "intercept": -6.353636441401392,
            "slope": 12.505453614307875
          },
          "intercept": -41868.443449200946,
          "kind": "two_phase",
          "left": {
            "phase": "NI2TA_C11B",
            "x": 0.33334536762962313
          },
          "mu_a_rel": -41868.443449200946,
          "mu_b_rel": -11755.67952137678,
          "right": {
            "phase": "NITA_D85",
            "x": 0.537427611200881
          },
          "slope": 30112.763927824166,
          "x_hi": 0.537427611200881,
          "x_lo": 0.33334536762962313
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -25575.549986658312,
                25.85078397440611,
                -0.9001800824720547,
                2.0031513271845895
              ]
            ],
            "knots": [
              0.537427611200881,
              0.5383561975667149
            ],
            "max_abs_error": 0.21003976639985922
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -5.372690664950895,
                -0.005923518398621502,
                -0.00562401026152529,
                0.0012147853533151266
              ]
            ],
            "knots": [
              0.537427611200881,
              0.5383561975667149
            ],
            "max_abs_error": 0.00038940257524355815
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -23973.682264903196,
              27.616880983968425,
              0.776618578486655,
              1.6409630735861853
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.537427611200881,
            0.5383561975667149
          ],
          "max_abs_error": 0.096323307541752,
          "phase": "NITA_D85",
          "x_hi": 0.5383561975667149,
          "x_lo": 0.537427611200881
        },
        {
          "enthalpy": {
            "intercept": -43824.45059017071,
            "slope": 33947.51363750522
          },
          "entropy": {
            "intercept": 6.054459818723566,
            "slope": -10.5856037734749
          },
          "intercept": -45629.58778512309,
          "kind": "two_phase",
          "left": {
            "phase": "NITA_D85",
            "x": 0.5383561975667149
          },
          "mu_a_rel": -45629.58778512309,
          "mu_b_rel": -8525.976382556408,
          "right": {
            "phase": "NITA2_C16",
            "x": 0.6666172740059646
          },
          "slope": 37103.61140256668,
          "x_hi": 0.6666172740059646,
          "x_lo": 0.5383561975667149
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -21194.451589856675,
                5.422818719127107,
                17.01433055986689,
                -6.97541854499849
              ],
              [
                -21178.98985912268,
                30.76615708016959,
                0.09986423855339055,
                -0.010806072038075598
              ],
              [
                -21148.134643875997,
                49.49336063649461,
                0.18486923364878294,
                -0.0013915679945739612
              ],
              [
                -21098.457805573853,
                49.858919944469804,
                0.1812261093931724,
                -0.00014272692933303688
              ],
              [
                -21048.41780224692,
                50.220943439855304,
                0.18081981881362452,
                -3.4161455850778566e-05
              ],
              [
                -20998.016073149705,
                50.58248046972057,
                0.1807062035563476,
                -5.392311742014044e-06
              ],
              [
                -20947.252891868742,
                50.94395720573328,
                0.18054552088594988,
                6.060269063112855e-05
              ],
              [
                -20896.12832853942,
                51.30523004026614,
                0.18071353788811706,
                -4.046614460406772e-05
              ],
              [
                -20844.64242542741,
                51.666364733542544,
                0.18065900946574942,
                -1.2805995410758442e-06
              ]
            ],
            "knots": [
              0.6666172740059646,
              0.6668623488952408,
              0.667270802838393,
              0.6679243291474366,
              0.6685778554564802,
              0.6692313817655238,
              0.6698849080745674,
              0.6705384343836109,
              0.6711919606926545,
              0.671845484501443
            ],
            "max_abs_error": 0.2066880058555398
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -6.294644382162043,
                -0.011401714627811537,
                0.04711747328451123,
                -0.020285650141036466
              ],
              [
                -6.279214273646379,
                0.03664235912340426,
                -0.002613172469652293,
                0.000521697029737235
              ],
              [
                -6.244663389962893,
                0.05278306145861726,
                -0.002660227624341177,
                0.00044176400285414474
              ],
              [
                -6.194098792125761,
                0.04878938444756003,
                -0.0013771545666673018,
                0.00014713634018602428
              ],
              [
                -6.146539425904682,
                0.04647690833019336,
                -0.0009301943320426179,
                7.30721792588443e-05
              ],
              [
                -6.100919639727273,
                0.044835911719861135,
                -0.0007041786490114416,
                4.361826219016762e-05
              ],
              [
                -6.056744288394234,
                0.04355857285237095,
                -0.0005681220559533295,
                2.9021891673058908e-05
              ],
              [
                -6.013724815706142,
                0.04250944544517019,
                -0.0004770198114626492,
                2.059105011465584e-05
              ],
              [
                -5.971671799022321,
                0.041617075317306525,
                -0.00041206021595264347,
                1.5432613083128655e-05
              ]
            ],
            "knots": [
              0.6666172740059646,
              0.6668623488952408,
              0.667270802838393,
              0.6679243291474366,
              0.6685778554564802,
              0.6692313817655238,
              0.6698849080745674,
              0.6705384343836109,
              0.6711919606926545,
              0.671845484501443
            ],
            "max_abs_error": 0.0006010822932074333
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -19317.703367315065,
              23.525821765906187,
              13.433324296947852,
              -5.544032906353117
            ],
            [
              -19286.28825415856,
              33.75609086264421,
              0.9780160997052576,
              -0.13310350533907922
            ],
            [
              -19251.687250701558,
              35.3123649713947,
              0.5918247436208119,
              -0.044011426900972594
            ],
            [
              -19215.82707241344,
              36.36385322126418,
              0.45815725879901237,
              -0.021820631641723764
            ],
            [
              -19179.026882565016,
              37.214653390358585,
              0.3906570678868775,
              -0.013010177228807152
            ],
            [
              -19141.434582284004,
              37.95696870984262,
              0.3499311117389965,
              -0.008592274212432471
            ],
            [
              -19103.136274736637,
              38.63103888079298,
              0.32293699465370196,
              -0.006179687716922899
            ],
            [
              -19064.188478548906,
              39.258233727703846,
              0.3035147628853636,
              -0.004602514260234614
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.6666172740059646,
            0.667270802838393,
            0.6679243291474366,
            0.6685778554564802,
            0.6692313817655238,
            0.6698849080745674,
            0.6705384343836109,
            0.6711919606926545,
            0.671845484501443
          ],
          "max_abs_error": 0.4422851566087047,
          "phase": "NITA2_C16",
          "x_hi": 0.671845484501443,
          "x_lo": 0.6666172740059646
        },
        {
          "enthalpy": {
            "intercept": -63362.819711241915,
            "slope": 63362.81971124192
          },
          "entropy": {
            "intercept": -2.037233681308161,
            "slope": 2.037233681308161
          },
          "intercept": -62755.41848915991,
          "kind": "two_phase",
          "left": {
            "phase": "NITA2_C16",
            "x": 0.671845484501443
          },
          "mu_a_rel": -62755.41848915991,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "BCC_A2",
            "x": 1.0
          },
          "slope": 62755.41848915991,
          "x_hi": 1.0,
          "x_lo": 0.671845484501443
        }
      ],
      "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": -25806.18971369238,
          "energy_per_atom": -25806.18971369238,
          "enthalpy": -25210.66837763255,
          "entries_at_x": 1,
          "entropy": 1.9973883483475703,
          "formula": "",
          "nsites": null,
          "phase": "NI3TA",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2499998122192772
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -31830.825637997747,
          "energy_per_atom": -31830.825637997747,
          "enthalpy": -32482.65124632648,
          "entries_at_x": 1,
          "entropy": -2.186233802880235,
          "formula": "",
          "nsites": null,
          "phase": "NI2TA_C11B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333333333183449
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -31830.49308733635,
          "energy_per_atom": -31830.49308733635,
          "enthalpy": -32481.951257419183,
          "entries_at_x": 1,
          "entropy": -2.185001408964734,
          "formula": "",
          "nsites": null,
          "phase": "NI2TA_C11B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.33334536762962313
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -25685.01266481435,
          "energy_per_atom": -25685.01266481435,
          "enthalpy": -25575.549986658312,
          "entries_at_x": 1,
          "entropy": 0.36713962151951307,
          "formula": "",
          "nsites": null,
          "phase": "NITA_D85",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.537427611200881
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -25654.62863444429,
          "energy_per_atom": -25654.62863444429,
          "enthalpy": -25548.5962314392,
          "entries_at_x": 1,
          "entropy": 0.3556344222877499,
          "formula": "",
          "nsites": null,
          "phase": "NITA_D85",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.5383561975667149
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -20895.679496167468,
          "energy_per_atom": -20895.679496167468,
          "enthalpy": -21194.451589856675,
          "entries_at_x": 1,
          "entropy": -1.0020865124575238,
          "formula": "",
          "nsites": null,
          "phase": "NITA2_C16",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666172740059646
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -20593.473949219457,
          "energy_per_atom": -20593.473949219457,
          "enthalpy": -20792.79540296501,
          "entries_at_x": 1,
          "entropy": -0.6685274316470213,
          "formula": "",
          "nsites": null,
          "phase": "NITA2_C16",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.671845484501443
        },
        {
          "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": 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": "NiTa-19Zho",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:54:37Z",
    "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/NiTa-19Zho.tdb",
    "source_sha256": "02b9c3696c463343e65421714856a2af6163db2a8684a7a504a06ed04cdf6293"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "NI-TA",
  "x_element": "TA"
}