{
  "counts": {
    "above_hull": 0,
    "entries": 9,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "NI",
    "V"
  ],
  "flags": [
    "has_intermediate_phases",
    "miscibility_gap",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "NI": {
          "energy": -8883.518859486847,
          "phase": "FCC_A1"
        },
        "V": {
          "energy": -9209.85341647994,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -9459.123498963525,
                2539.189769740212,
                -197.00450021549568
              ]
            ],
            "knots": [
              0.0,
              0.13166910981588814
            ],
            "max_abs_error": 0.5073641551416586
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -3.222264580725544,
                0.681899813288741,
                -0.03001683572096092
              ]
            ],
            "knots": [
              0.0,
              0.13166910981588814
            ],
            "max_abs_error": 4.862385523729529e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -8498.405314220328,
              2335.881340408425,
              -188.05498064541462
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.13166910981588814
          ],
          "max_abs_error": 0.4929138886036526,
          "phase": "FCC_A1",
          "x_hi": 0.13166910981588814,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -2230.9796850713883,
            "slope": -37107.8573493769
          },
          "entropy": {
            "intercept": 0.2639359350146281,
            "slope": 3.072545172431642
          },
          "intercept": -2309.672184095999,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 0.13166910981588814
          },
          "mu_a_rel": -2309.672184095999,
          "mu_b_rel": -40333.60887663339,
          "right": {
            "phase": "NI3V_D022",
            "x": 0.24975810757271769
          },
          "slope": -38023.93669253739,
          "x_hi": 0.24975810757271769,
          "x_lo": 0.13166910981588814
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -11498.967912730126,
                -13.194823944163536,
                -0.00015347688077760324,
                7.343739253862225e-05
              ]
            ],
            "knots": [
              0.24975810757271769,
              0.2499848794181435
            ],
            "max_abs_error": 9.013152521220036e-06
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -3.6419747033679357,
                -0.01740849680957464,
                0.0005909866599389593,
                -0.0021277650025095587
              ]
            ],
            "knots": [
              0.24975810757271769,
              0.2499848794181435
            ],
            "max_abs_error": 0.00015717826901218146
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -10413.113154920975,
              -8.004480620798212,
              -0.17635614842900527,
              0.6344665721876313
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.24975810757271769,
            0.2499848794181435
          ],
          "max_abs_error": 0.04687162581467419,
          "phase": "NI3V_D022",
          "x_hi": 0.2499848794181435,
          "x_lo": 0.24975810757271769
        },
        {
          "enthalpy": {
            "intercept": 190.5711340189082,
            "slope": -46813.76720852708
          },
          "entropy": {
            "intercept": 14.148072189063305,
            "slope": -52.53764060217013
          },
          "intercept": -4027.6765891503173,
          "kind": "two_phase",
          "left": {
            "phase": "NI3V_D022",
            "x": 0.2499848794181435
          },
          "mu_a_rel": -4027.6765891503173,
          "mu_b_rel": -35177.34625214037,
          "right": {
            "phase": "SIGMA_D8B#1",
            "x": 0.46666666475373925
          },
          "slope": -31149.669662990054,
          "x_hi": 0.46666666475373925,
          "x_lo": 0.2499848794181435
        },
        {
          "enthalpy": {
            "intercept": -23569.11415832201,
            "slope": 4099.84434090498
          },
          "entropy": {
            "intercept": -12.55469660265575,
            "slope": 4.682578471780969
          },
          "intercept": -19825.93136624019,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_D8B#1",
            "x": 0.46666666475373925
          },
          "mu_a_rel": -19825.93136624019,
          "mu_b_rel": -17122.197796696724,
          "right": {
            "phase": "SIGMA_D8B#2",
            "x": 0.6666666666660614
          },
          "slope": 2703.7335695434667,
          "x_hi": 0.6666666666660614,
          "x_lo": 0.46666666475373925
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -20835.88459772117,
                0.8284562986714803,
                0.0005178986997490531,
                -0.0002580571402942544
              ]
            ],
            "knots": [
              0.6666666666660614,
              0.6666763070083845
            ],
            "max_abs_error": 3.702037429320626e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -14.72525087968688,
                0.0015550290274557706,
                -0.0006960374420033528,
                0.0003079434710949098
              ]
            ],
            "knots": [
              0.6666666666660614,
              0.6666763070083845
            ],
            "max_abs_error": 3.441831455042177e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -16445.551047942532,
              0.36482439415706885,
              0.20804146163652004,
              -0.09207140266595926
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.6666666666660614,
            0.6666763070083845
          ],
          "max_abs_error": 0.010298549212166108,
          "phase": "SIGMA_D8B#2",
          "x_hi": 0.6666763070083845,
          "x_lo": 0.6666666666660614
        },
        {
          "enthalpy": {
            "intercept": -62507.155677805,
            "slope": 62507.24580752195
          },
          "entropy": {
            "intercept": -28.29706142485867,
            "slope": 28.297383572331857
          },
          "intercept": -54070.38681398338,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_D8B#2",
            "x": 0.6666763070083845
          },
          "mu_a_rel": -54070.38681398338,
          "mu_b_rel": -0.005918552182265557,
          "right": {
            "phase": "BCC_A2",
            "x": 0.999997582095399
          },
          "slope": 54070.3808954312,
          "x_hi": 0.999997582095399,
          "x_lo": 0.6666763070083845
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -0.06100684028526618,
                0.06103186465254828,
                0.002304191558709652,
                -0.002329215925991751
              ]
            ],
            "knots": [
              0.999997582095399,
              1.0
            ],
            "max_abs_error": 0.00033395825244282584
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -2.6368165356696247e-05,
                2.6199446320486945e-05,
                -1.539673475896204e-05,
                1.5565453795171343e-05
              ]
            ],
            "knots": [
              0.999997582095399,
              1.0
            ],
            "max_abs_error": 2.231757036002756e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -0.0531451717867715,
              0.05322049995238241,
              0.006894727658984912,
              -0.006970055824595818
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.999997582095399,
            1.0
          ],
          "max_abs_error": 0.0009993566384278695,
          "phase": "BCC_A2",
          "x_hi": 1.0,
          "x_lo": 0.999997582095399
        }
      ],
      "phase_instances": {
        "SIGMA_D8B#1": "SIGMA_D8B",
        "SIGMA_D8B#2": "SIGMA_D8B"
      },
      "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": -7316.250080098083,
          "energy_per_atom": -7316.250080098083,
          "enthalpy": -7116.938229438807,
          "entries_at_x": 1,
          "entropy": 0.6684952227378069,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.13166910981588814
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -11806.45865488896,
          "energy_per_atom": -11806.45865488896,
          "enthalpy": -11498.967912730126,
          "entries_at_x": 1,
          "entropy": 1.0313290027128446,
          "formula": "",
          "nsites": null,
          "phase": "NI3V_D022",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.24975810757271769
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -11814.623003767889,
          "energy_per_atom": -11814.623003767889,
          "enthalpy": -11512.162816713775,
          "entries_at_x": 1,
          "entropy": 1.014456438216044,
          "formula": "",
          "nsites": null,
          "phase": "NI3V_D022",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2499848794181435
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -18564.18903895862,
          "energy_per_atom": -18564.18903895862,
          "enthalpy": -21655.85347374239,
          "entries_at_x": 1,
          "entropy": -10.369493324782063,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.46666666475373925
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -18023.442319879516,
          "energy_per_atom": -18023.442319879516,
          "enthalpy": -20835.88459772117,
          "entries_at_x": 1,
          "entropy": -9.43297762147127,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666666666660614
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -18022.944960080604,
          "energy_per_atom": -18022.944960080604,
          "enthalpy": -20835.05588158094,
          "entries_at_x": 1,
          "entropy": -9.431866246856739,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666763070083845
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.136655574930046,
          "energy_per_atom": -0.136655574930046,
          "enthalpy": -0.06100684028526618,
          "entries_at_x": 1,
          "entropy": 0.00025372709925264303,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.999997582095399
        },
        {
          "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": "NiV-01Wat",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:55:12Z",
    "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/NiV-01Wat.tdb",
    "source_sha256": "cd99dd38bf6fcab8c72cb4c1623eccb56a6377ca7b6984ec6ac5c5f023de394c"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "NI-V",
  "x_element": "V"
}
