{
  "counts": {
    "above_hull": 0,
    "entries": 8,
    "intervals": 7,
    "vertices": 8
  },
  "elements": [
    "FE",
    "V"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "FE": {
          "energy": -8133.457562994563,
          "phase": "BCC_A2"
        },
        "V": {
          "energy": -9209.853419245143,
          "phase": "BCC_A2"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -965.2136997449551,
                -24.883924342676778,
                28.90879840491698
              ],
              [
                -961.188825682715,
                -928.2444629204849,
                62.12207053356656,
                14.64248417828162
              ],
              [
                -1812.6687338913516,
                -760.0649045859411,
                105.79862466587599,
                3.9544582290396875
              ],
              [
                -2462.9805555823773,
                -536.5986504404144,
                117.04565693023204,
                -3.4790952316440666
              ]
            ],
            "knots": [
              0.0,
              0.05175867394858063,
              0.10351734689716126,
              0.15527601984574188,
              0.20703468710231693
            ],
            "max_abs_error": 0.24186959886287696
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                0.23382636102682516,
                0.13741645274038816,
                0.003534795246514011
              ]
            ],
            "knots": [
              0.0,
              0.20703468710231693
            ],
            "max_abs_error": 0.0014910153656166047
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -982.6425328617103,
              -26.862101885349375,
              28.617716996666218
            ],
            [
              -980.8869177503936,
              -950.5030537296573,
              59.30689969322725,
              14.614250397691421
            ],
            [
              -1857.4688213891313,
              -788.0385865366153,
              102.92494549448179,
              4.015139612288522
            ],
            [
              -2538.5673228189758,
              -570.1376115157759,
              114.3686595085984,
              -3.4163136254911706
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.05175867394858063,
            0.10351734689716126,
            0.15527601984574188,
            0.20703468710231693
          ],
          "max_abs_error": 0.23631703680058536,
          "phase": "BCC_A2#1",
          "x_hi": 0.20703468710231693,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -1692.5826016182953,
            "slope": -5764.396582086332
          },
          "entropy": {
            "intercept": 1.587939951298563,
            "slope": 14.621820629288427
          },
          "intercept": -2166.026898097956,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2#1",
            "x": 0.20703468710231693
          },
          "mu_a_rel": -2166.026898097956,
          "mu_b_rel": -12289.919300806656,
          "right": {
            "phase": "SIGMA_D8B",
            "x": 0.4541905010355593
          },
          "slope": -10123.8924027087,
          "x_hi": 0.4541905010355593,
          "x_lo": 0.20703468710231693
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -4310.716773403752,
                -150.20458731745353,
                4.1666000406075625,
                4.363683103747462e-07
              ],
              [
                -4456.75476024423,
                -141.87126763322703,
                4.166611535343691,
                4.128261934965849e-06
              ],
              [
                -4594.4594122138515,
                -100.15352423204969,
                2.34372941789114,
                1.851842185374153e-06
              ],
              [
                -4692.269205176169,
                -159.1100999682453,
                6.5103843773631525,
                2.0060244423802942e-05
              ],
              [
                -4844.868900706803,
                -116.87141462786714,
                4.166692964767208,
                1.5556386642856523e-05
              ],
              [
                -4957.5736068135175,
                -108.53798035561805,
                4.166760174212797,
                2.47350645423694e-05
              ],
              [
                -5061.944802259857,
                -75.15329011476251,
                2.343866175118805,
                1.2055777929731448e-05
              ],
              [
                -5134.754214143724,
                -117.44254277525292,
                6.510908252161187,
                0.00014175591974208146
              ],
              [
                -5245.685706910897,
                -62.65219318151094,
                2.3441690194195033,
                2.513639810075574e-05
              ],
              [
                -5305.993705936588,
                -96.6063326207154,
                6.5120621774690335,
                0.00047908102760629845
              ],
              [
                -5396.087497298808,
                -66.86463354439364,
                4.16901930063068,
                0.00047695454486529343
              ],
              [
                -5458.782634588025,
                -58.52504527108117,
                4.171136552067267,
                0.0013229246310828557
              ],
              [
                -5513.135220382409,
                -50.17894150631583,
                4.176679019066796,
                0.0036959951794415247
              ],
              [
                -5559.133786874476,
                -41.81510797498811,
                4.191772195134391,
                0.015340000603472959
              ],
              [
                -5596.741782653728,
                -41.73837681203623,
                6.395552514490188,
                0.5390049377019785
              ],
              [
                -5631.545602013573,
                -17.775115345164792,
                -29.42081034336931,
                63.49211298197494
              ]
            ],
            "knots": [
              0.4541905010355593,
              0.46752369410823297,
              0.480856877078569,
              0.4908567643063211,
              0.5075232430192411,
              0.5208564259895772,
              0.5341896089599133,
              0.5441894961876653,
              0.5608559749005855,
              0.5708558621283375,
              0.5875223408412575,
              0.6008555238115936,
              0.6141887067819297,
              0.6275218897522657,
              0.6408550727226019,
              0.6575215514355219,
              0.667521423469126
            ],
            "max_abs_error": 1.8812615125470984
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                2.5008306208264717,
                -0.05356154878424281,
                -0.001588133782570389,
                -1.1653548931511715e-05
              ],
              [
                2.4456692847107275,
                -0.09462052255622369,
                -0.004570794932758568,
                -0.00010096904048707833
              ],
              [
                2.3463769981812588,
                -0.062438508094456495,
                -0.0017879178636084209,
                -1.7701167928776962e-05
              ],
              [
                2.282132871055265,
                -0.1101114379049295,
                -0.005208166894183894,
                -0.00015212586634884284
              ],
              [
                2.1666611403898033,
                -0.0725897182850712,
                -0.0020895218459653364,
                -2.6727035491447282e-05
              ],
              [
                2.0919551732232753,
                -0.1280800292391046,
                -0.00616877689019496,
                -0.00023253761057212552
              ],
              [
                1.957473829483403,
                -0.08466779702298365,
                -0.0025499566221247605,
                -4.170262389857626e-05
              ],
              [
                1.870214373214396,
                -0.1498186123233657,
                -0.007650603857272981,
                -0.0003741023648311803
              ],
              [
                1.7123710546689264,
                -0.09974273681660327,
                -0.003287779848878611,
                -6.993192472438958e-05
              ],
              [
                1.60927060607872,
                -0.17754111529193484,
                -0.010079150930807135,
                -0.0006636888803099872
              ],
              [
                1.4209866509756681,
                -0.11980812858035426,
                -0.004588679980645632,
                -0.00013361052413560226
              ],
              [
                1.2964562318905326,
                -0.2156289286866145,
                -0.014531326356569813,
                -0.0014160940530605626
              ],
              [
                1.0648798827942878,
                -0.19912380612804625,
                -0.012807721306410585,
                -0.0011486545021384409
              ],
              [
                0.8517997008576925,
                -0.22811805013851771,
                -0.017650563814443965,
                -0.002295051687196681
              ],
              [
                0.6037360352175343,
                -0.3375952509798119,
                -0.038728088949811335,
                -0.017547023209359358
              ],
              [
                0.20986567207855167,
                -0.2800802007232033,
                -0.14561308489561886,
                0.1563163320236235
              ]
            ],
            "knots": [
              0.4541905010355593,
              0.4641903983656489,
              0.480856877078569,
              0.4908567643063211,
              0.5075232430192411,
              0.5175231302469931,
              0.5341896089599133,
              0.5441894961876653,
              0.5608559749005855,
              0.5708558621283375,
              0.5875223408412575,
              0.5975222280690096,
              0.6141887067819297,
              0.6275218897522657,
              0.6408550727226019,
              0.6575215514355219,
              0.667521423469126
            ],
            "max_abs_error": 0.0046316288024946806
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -5056.339423003169,
              -96.68409316994094,
              2.8172031247584357,
              0.0034867468577601812
            ],
            [
              -5150.202826301492,
              -151.73211615652593,
              7.87312319809962,
              0.030105038322744804
            ],
            [
              -5294.031714221597,
              -81.53748304369375,
              2.876797128959595,
              0.005279455028642133
            ],
            [
              -5372.687120681302,
              -126.28037475688188,
              8.06319933685974,
              0.045376387294695064
            ],
            [
              -5490.858919714029,
              -66.01093646420486,
              2.966748410894972,
              0.007981887542889865
            ],
            [
              -5553.895125879797,
              -100.08962855641352,
              8.349747800633494,
              0.06938211524210658
            ],
            [
              -5645.565624520335,
              -49.90958643236172,
              3.104135741979917,
              0.012445693115296308
            ],
            [
              -5692.3586295176,
              -72.77412351102886,
              8.791935792179864,
              0.1116803760107743
            ],
            [
              -5756.229136860441,
              -32.91389619962456,
              3.324420581303002,
              0.0208753398051158
            ],
            [
              -5785.797737138957,
              -43.67244909644797,
              9.517161027532897,
              0.19835792066350777
            ],
            [
              -5819.754667287207,
              -14.427681622047203,
              3.7132325967959323,
              0.03998541703731551
            ],
            [
              -5830.429130895425,
              -11.473398040448123,
              10.848800375797856,
              0.42457112254452944
            ],
            [
              -5830.629157437529,
              9.189821290750842,
              7.995301126584309,
              0.34616733499933616
            ],
            [
              -5813.0978676851955,
              26.19828867380078,
              9.45428779641766,
              0.6996096611383535
            ],
            [
              -5776.745681553839,
              47.13251781408326,
              12.330337934325144,
              2.0815309435311065
            ],
            [
              -5715.2012948618985,
              77.32351036626392,
              5.935140182190338,
              34.43651817750029
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.4541905010355593,
            0.4641903983656489,
            0.480856877078569,
            0.4908567643063211,
            0.5075232430192411,
            0.5175231302469931,
            0.5341896089599133,
            0.5441894961876653,
            0.5608559749005855,
            0.5708558621283375,
            0.5875223408412575,
            0.5975222280690096,
            0.6141887067819297,
            0.6275218897522657,
            0.6408550727226019,
            0.6541882556929379,
            0.667521423469126
          ],
          "max_abs_error": 1.225004474551497,
          "phase": "SIGMA_D8B",
          "x_hi": 0.667521423469126,
          "x_lo": 0.4541905010355593
        },
        {
          "enthalpy": {
            "intercept": -15211.639368852568,
            "slope": 14376.152759651897
          },
          "entropy": {
            "intercept": 12.190213968078458,
            "slope": -10.430214685058624
          },
          "intercept": -18846.151663435197,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_D8B",
            "x": 0.667521423469126
          },
          "mu_a_rel": -18846.151663435197,
          "mu_b_rel": -1360.23039543302,
          "right": {
            "phase": "SIGMA_OLD",
            "x": 0.7280998815585921
          },
          "slope": 17485.921268002177,
          "x_hi": 0.7280998815585921,
          "x_lo": 0.667521423469126
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -4744.3642472817955,
                7.721780528715323,
                0.06999613420823536,
                -3.3946179200938786e-11
              ]
            ],
            "knots": [
              0.7280998815585921,
              0.7296722036878965
            ],
            "max_abs_error": 3.001332515850663e-11
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.2691454009072576,
                -0.053437615115581344,
                -0.0018849021311794154,
                -0.0002771982179578039
              ]
            ],
            "knots": [
              0.7280998815585921,
              0.7296722036878965
            ],
            "max_abs_error": 3.0770470116348037e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -4664.118546001296,
              23.654205475389936,
              0.6319797044956843,
              0.08264664880930894
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.7280998815585921,
            0.7296722036878965
          ],
          "max_abs_error": 0.0009174215665552765,
          "phase": "SIGMA_OLD",
          "x_hi": 0.7296722036878965,
          "x_lo": 0.7280998815585921
        },
        {
          "enthalpy": {
            "intercept": -18034.358059296374,
            "slope": 18224.328022183156
          },
          "entropy": {
            "intercept": 5.121921362673987,
            "slope": -0.8147139558978932
          },
          "intercept": -19561.45891357763,
          "kind": "two_phase",
          "left": {
            "phase": "SIGMA_OLD",
            "x": 0.7296722036878965
          },
          "mu_a_rel": -19561.45891357763,
          "mu_b_rel": -1094.223925443508,
          "right": {
            "phase": "BCC_A2#2",
            "x": 0.8697025500221719
          },
          "slope": 18467.23498813412,
          "x_hi": 0.8697025500221719,
          "x_lo": 0.7296722036878965
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -2184.6135059631574,
                1434.0917837277425,
                713.9137986985388,
                36.60792353687566
              ]
            ],
            "knots": [
              0.8697025500221719,
              1.0
            ],
            "max_abs_error": 0.001990560161743815
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                1.1960666512192395,
                -1.2039562225178617,
                0.007890946889621553,
                -1.3755909993307114e-06
              ]
            ],
            "knots": [
              0.8697025500221719,
              1.0
            ],
            "max_abs_error": 5.133198083540069e-07
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -2541.2207780241733,
              1793.0513314715304,
              711.5611128831879,
              36.60833366945508
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.8697025500221719,
            1.0
          ],
          "max_abs_error": 0.002142387168873938,
          "phase": "BCC_A2#2",
          "x_hi": 1.0,
          "x_lo": 0.8697025500221719
        }
      ],
      "phase_instances": {
        "BCC_A2#1": "BCC_A2",
        "BCC_A2#2": "BCC_A2"
      },
      "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#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -4262.023793950275,
          "energy_per_atom": -4262.023793950275,
          "enthalpy": -2886.0126443242043,
          "entries_at_x": 1,
          "entropy": 4.6151640101494955,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.20703468710231693
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -6764.202660914312,
          "energy_per_atom": -6764.202660914312,
          "enthalpy": -4310.716773403752,
          "entries_at_x": 1,
          "entropy": 8.22903198896715,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.4541905010355593
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -7173.924607949319,
          "energy_per_atom": -7173.924607949319,
          "enthalpy": -5615.24941472013,
          "entries_at_x": 1,
          "entropy": 5.227822214419543,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_D8B",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.667521423469126
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -6114.654459259946,
          "energy_per_atom": -6114.654459259946,
          "enthalpy": -4744.3642472817955,
          "entries_at_x": 1,
          "entropy": 4.595975891256586,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_OLD",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7280998815585921
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -6086.430863763579,
          "energy_per_atom": -6086.430863763579,
          "enthalpy": -4736.572470618904,
          "entries_at_x": 1,
          "entropy": 4.527447235098688,
          "formula": "",
          "nsites": null,
          "phase": "SIGMA_OLD",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.7296722036878965
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -3500.45755253871,
          "energy_per_atom": -3500.45755253871,
          "enthalpy": -2184.6135059631574,
          "entries_at_x": 1,
          "entropy": 4.413362557690938,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.8697025500221719
        },
        {
          "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#2",
          "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": "FeV-91Hua-LB",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:37:55Z",
    "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/FeV-91Hua-LB.tdb",
    "source_sha256": "879c739fcb81e8717cefff8487f75c373a1caee90c855401fdbec2be3f22a113"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "FE-V",
  "x_element": "V"
}
