{
  "counts": {
    "above_hull": 0,
    "entries": 9,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "CO",
    "V"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "CO": {
          "energy": -8956.449391245658,
          "phase": "HCP_A3"
        },
        "V": {
          "energy": -9209.853396891784,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -1151.1974640227204,
                137.32228804195086,
                -4.67764387938098
              ]
            ],
            "knots": [
              0.0,
              0.03161129015397399
            ],
            "max_abs_error": 0.003353763067707405
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -0.8361746979896816,
                0.029363123187135853,
                0.00031395820736657143
              ]
            ],
            "knots": [
              0.0,
              0.03161129015397399
            ],
            "max_abs_error": 6.447776004836481e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -901.8919778169947,
              128.5676728636122,
              -4.771250518914599
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.03161129015397399
          ],
          "max_abs_error": 0.0015228305695131894,
          "phase": "HCP_A3",
          "x_hi": 0.03161129015397399,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -251.80259021886388,
            "slope": -24255.58165790001
          },
          "entropy": {
            "intercept": -0.17827058585195,
            "slope": 17.028295517793936
          },
          "intercept": -198.65121504710305,
          "kind": "two_phase",
          "left": {
            "phase": "HCP_A3",
            "x": 0.03161129015397399
          },
          "mu_a_rel": -198.65121504710305,
          "mu_b_rel": -29531.219181577406,
          "right": {
            "phase": "CO3V",
            "x": 0.20758417275667215
          },
          "slope": -29332.567966530303,
          "x_hi": 0.20758417275667215,
          "x_lo": 0.03161129015397399
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -5286.877443405948,
                -2469.2089665754015,
                875.4644100103895,
                24.31009991052008
              ]
            ],
            "knots": [
              0.20758417275667215,
              0.3024986276459363
            ],
            "max_abs_error": 0.250135457059514
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.8899799539251116,
                -0.0011561399063288505,
                -0.2971596032634244,
                0.08932713436985862
              ],
              [
                -1.0989685627250063,
                -0.32748981332894017,
                -0.062156518585688936,
                0.016843075207892078
              ]
            ],
            "knots": [
              0.20758417275667215,
              0.2550414062774099,
              0.3024986276459363
            ],
            "max_abs_error": 0.003236462435313725
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -5021.529920143181,
              -617.1301332408913,
              80.48234736950843,
              -5.402537072941129
            ],
            [
              -5563.580243087505,
              -472.375121021099,
              65.56777890858166,
              -1.3043651123020936
            ],
            [
              -5971.691950312323,
              -345.1532663238244,
              61.81891779692057,
              -0.3955116247478827
            ],
            [
              -6255.4218104639785,
              -222.7022076492664,
              60.678026822639296,
              -0.05714080626960083
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.20758417275667215,
            0.23131279582738473,
            0.2550414062774099,
            0.2787700167274351,
            0.3024986276459363
          ],
          "max_abs_error": 0.13813928372837836,
          "phase": "CO3V",
          "x_hi": 0.3024986276459363,
          "x_lo": 0.20758417275667215
        },
        {
          "enthalpy": {
            "intercept": -4725.222618259597,
            "slope": -7044.955206524787
          },
          "entropy": {
            "intercept": 4.330561467608541,
            "slope": -2.333385399761537
          },
          "intercept": -6016.379519827076,
          "kind": "two_phase",
          "left": {
            "phase": "CO3V",
            "x": 0.3024986276459363
          },
          "mu_a_rel": -6016.379519827076,
          "mu_b_rel": -12365.635869413007,
          "right": {
            "phase": "SIGMA_OLD",
            "x": 0.4694955946889772
          },
          "slope": -6349.256349585931,
          "x_hi": 0.4694955946889772,
          "x_lo": 0.3024986276459363
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -8032.798052504158,
                -1768.2094099808974,
                3110.8254788488384,
                -85.04900564385662
              ]
            ],
            "knots": [
              0.4694955946889772,
              0.7073870681199336
            ],
            "max_abs_error": 0.004215928154735593
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -2.512615880062982,
                -0.1382752004526261,
                0.019552038772962507,
                -0.0006730199706276169
              ],
              [
                -2.632012061713273,
                -0.10118916874059002,
                0.017392399376847736,
                -0.0008424014512403294
              ],
              [
                -2.716651232528255,
                -0.0689301003436183,
                0.014693356237522763,
                -0.0010839787771986728
              ],
              [
                -2.7719719554115487,
                -0.04279299843499405,
                0.011227554834526827,
                -0.001465093024578052
              ],
              [
                -2.8050024920365937,
                -0.024729100180625536,
                0.006561601664085398,
                -0.002137233959057877
              ],
              [
                -2.8253072245121915,
                -0.018009668079788235,
                -0.00018181063957434934,
                -0.0035112040555154087
              ],
              [
                -2.8470099072870703,
                -0.02888550831986002,
                -0.010959153662818535,
                -0.007058469557258293
              ],
              [
                -2.893913038827007,
                -0.07190354310830352,
                -0.029701028612007158,
                -0.021983647887990038
              ]
            ],
            "knots": [
              0.4694955946889772,
              0.49923201937777106,
              0.5289684539354675,
              0.558704888493164,
              0.5884413230508605,
              0.618177757608557,
              0.6479141921662535,
              0.6776506267239499,
              0.7073870681199336
            ],
            "max_abs_error": 0.0004337456332774714
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -7283.661627863396,
              -179.7993546943622,
              42.763452446911714,
              0.04478421128672494
            ],
            [
              -7420.652745899557,
              -94.13843797486767,
              42.90859022992305,
              0.09529145789559657
            ],
            [
              -7471.787302186609,
              -8.035827722495075,
              43.21452716506188,
              0.16731361681253532
            ],
            [
              -7436.441289127227,
              78.89447856118264,
              43.74906110116589,
              0.28094675254888557
            ],
            [
              -7313.51680271233,
              167.23423263279014,
              44.64142768963018,
              0.48134663168286806
            ],
            [
              -7101.159795758227,
              257.959289659908,
              46.15128810589988,
              0.8924632668339427
            ],
            [
              -6796.156754725586,
              352.9302411972993,
              48.86842958362496,
              1.9493542105826123
            ],
            [
              -6392.40872973408,
              456.4892322416532,
              53.959775178280665,
              6.39673323655154
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.4694955946889772,
            0.49923201937777106,
            0.5289684539354675,
            0.558704888493164,
            0.5884413230508605,
            0.618177757608557,
            0.6479141921662535,
            0.6776506267239499,
            0.7073870681199336
          ],
          "max_abs_error": 0.12927979822325142,
          "phase": "SIGMA_OLD",
          "x_hi": 0.7073870681199336,
          "x_lo": 0.4694955946889772
        },
        {
          "enthalpy": {
            "intercept": -21006.01158600383,
            "slope": 20117.38868021122
          },
          "entropy": {
            "intercept": 6.066296821482945,
            "slope": -5.736485558195788
          },
          "intercept": -22814.677983328926,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_OLD",
            "x": 0.7073870681199336
          },
          "mu_a_rel": -22814.677983328926,
          "mu_b_rel": -986.956133941705,
          "right": {
            "phase": "COV3_A15",
            "x": 0.75
          },
          "slope": 21827.72184938722,
          "x_hi": 0.75,
          "x_lo": 0.7073870681199336
        },
        {
          "enthalpy": {
            "intercept": -23676.90414061467,
            "slope": 23678.57875302568
          },
          "entropy": {
            "intercept": 7.0369167944706925,
            "slope": -7.0306455221794515
          },
          "intercept": -25774.96088288616,
          "kind": "two_phase",
          "left": {
            "phase": "COV3_A15",
            "x": 0.75
          },
          "mu_a_rel": -25774.96088288616,
          "mu_b_rel": -0.19516742262931075,
          "right": {
            "phase": "BCC_A2",
            "x": 0.9999212299510076
          },
          "slope": 25774.76571546353,
          "x_hi": 0.9999212299510076,
          "x_lo": 0.75
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -0.19055039743978447,
                0.19059078217847564,
                0.00018681007724319354,
                -0.00022719481593430624
              ]
            ],
            "knots": [
              0.9999212299510076,
              1.0
            ],
            "max_abs_error": 3.259106373776355e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -1.8253160676409003e-05,
                1.8026928297127067e-05,
                -1.662657058794095e-05,
                1.6852802967222885e-05
              ]
            ],
            "knots": [
              0.9999212299510076,
              1.0
            ],
            "max_abs_error": 2.4179954335085207e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -0.18510821758185125,
              0.18521605302460892,
              0.005144023225037625,
              -0.005251858667795289
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9999212299510076,
            1.0
          ],
          "max_abs_error": 0.0007535163886717433,
          "phase": "BCC_A2",
          "x_hi": 1.0,
          "x_lo": 0.9999212299510076
        }
      ],
      "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": "HCP_A3",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1125.8915319982552,
          "energy_per_atom": -1125.8915319982552,
          "enthalpy": -1018.5528198601505,
          "entries_at_x": 1,
          "entropy": 0.3600158045886488,
          "formula": "",
          "nsites": null,
          "phase": "HCP_A3",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.03161129015397399
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -6287.628071208157,
          "energy_per_atom": -6287.628071208157,
          "enthalpy": -5286.877443405948,
          "entries_at_x": 1,
          "entropy": 3.3565340526654524,
          "formula": "",
          "nsites": null,
          "phase": "CO3V",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.20758417275667215
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -7937.020852149068,
          "energy_per_atom": -7937.020852149068,
          "enthalpy": -6856.311900060438,
          "entries_at_x": 1,
          "entropy": 3.624715586411611,
          "formula": "",
          "nsites": null,
          "phase": "CO3V",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3024986276459363
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -8997.327405508688,
          "energy_per_atom": -8997.327405508688,
          "enthalpy": -8032.798052504158,
          "entries_at_x": 1,
          "entropy": 3.2350473017089207,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_OLD",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.4694955946889772
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -7374.029820553484,
          "energy_per_atom": -7374.029820553484,
          "enthalpy": -6775.230989280074,
          "entries_at_x": 1,
          "entropy": 2.008381121158486,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_OLD",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7073870681199336
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -6443.886596288508,
          "energy_per_atom": -6443.886596288508,
          "enthalpy": -5917.970075845414,
          "entries_at_x": 1,
          "entropy": 1.763932652836104,
          "formula": "",
          "nsites": null,
          "phase": "COV3_A15",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.75
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -2.225446980799461,
          "energy_per_atom": -2.225446980799461,
          "enthalpy": -0.19055039743978447,
          "entries_at_x": 1,
          "entropy": 0.006825076583471201,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9999212299510076
        },
        {
          "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": "CoV-15Wan",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:27:16Z",
    "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/CoV-15Wan.tdb",
    "source_sha256": "806d7a1de1b823d0674861c13ba0934f60c89b00e1bc7703800d0e90fbd696ee"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "CO-V",
  "x_element": "V"
}
