{
  "counts": {
    "above_hull": 0,
    "entries": 4,
    "intervals": 3,
    "vertices": 4
  },
  "elements": [
    "HF",
    "O"
  ],
  "flags": [
    "gas_on_hull",
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "HF": {
          "energy": -12987.41477850228,
          "phase": "HCP_A3"
        },
        "O": {
          "energy": -30548.980642019844,
          "phase": "O2GAS"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -29285.04785765702,
                159.48833969842235,
                18.62524913575544
              ],
              [
                -29106.934268822846,
                -28910.19731686367,
                215.93346233580814,
                25.30834742985462
              ],
              [
                -57775.88977592086,
                -28402.41413672211,
                292.6012458621335,
                34.80669873534498
              ],
              [
                -85850.89596804552,
                -27712.799160845432,
                397.9211327435587,
                48.57744367790656
              ]
            ],
            "knots": [
              0.0,
              0.04894458805762629,
              0.09788917511525258,
              0.14683376217287888,
              0.19577834763093221
            ],
            "max_abs_error": 0.2541524537955411
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -9.66755182342469,
                0.00929547479493742,
                -0.007119933611257068
              ],
              [
                -9.66537628224101,
                -9.670318389599295,
                -0.004538592309144107,
                -0.03210657744639356
              ]
            ],
            "knots": [
              0.0,
              0.09788917511525258,
              0.19577834763093221
            ],
            "max_abs_error": 0.000783789192091433
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -27843.85755485739,
              158.93382913927053,
              18.79951241486924
            ],
            [
              -27666.12421330325,
              -27469.593374376687,
              215.88818660422112,
              25.671563704992877
            ],
            [
              -54894.157837370716,
              -26960.811399235692,
              293.61018019085896,
              35.565807117956865
            ],
            [
              -81525.79324929761,
              -26266.9019092646,
              401.0931091418097,
              50.268620722745254
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.04894458805762629,
            0.09788917511525258,
            0.14683376217287888,
            0.19577834763093221
          ],
          "max_abs_error": 0.27514962713757996,
          "phase": "HCP_A3",
          "x_hi": 0.19577834763093221,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": -5257.472022759859,
            "slope": -550927.7498502505
          },
          "entropy": {
            "intercept": 4.595003103858627,
            "slope": -101.42026167065227
          },
          "intercept": -6627.472198175266,
          "kind": "two_phase",
          "left": {
            "phase": "HCP_A3",
            "x": 0.19577834763093221
          },
          "mu_a_rel": -6627.472198175266,
          "mu_b_rel": -527316.771031321,
          "right": {
            "phase": "HFO2_MONO",
            "x": 0.6666666666666666
          },
          "slope": -520689.29883314576,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.19577834763093221
        },
        {
          "enthalpy": {
            "intercept": -1117627.9157687805,
            "slope": 1117627.9157687805
          },
          "entropy": {
            "intercept": -189.0555140297286,
            "slope": 189.0555140297286
          },
          "intercept": -1061261.014260817,
          "kind": "two_phase",
          "left": {
            "phase": "HFO2_MONO",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -1061261.014260817,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "O2GAS",
            "x": 1.0
          },
          "slope": 1061261.014260817,
          "x_hi": 1.0,
          "x_lo": 0.6666666666666666
        }
      ],
      "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": -108567.16275283722,
          "energy_per_atom": -108567.16275283722,
          "enthalpy": -113117.19655246947,
          "entries_at_x": 1,
          "entropy": -15.260888142318443,
          "formula": "",
          "nsites": null,
          "phase": "HCP_A3",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.19577834763093221
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -353753.67142027244,
          "energy_per_atom": -353753.67142027244,
          "enthalpy": -372542.6385895935,
          "entries_at_x": 1,
          "entropy": -63.018504676576214,
          "formula": "",
          "nsites": null,
          "phase": "HFO2_MONO",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "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": "O2GAS",
          "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": "HfO-06Wan",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:42:31Z",
    "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/HfO-06Wan.tdb",
    "source_sha256": "54d88108dcb3dde716d231d5b0be71a7ca3bf047897b3503932d1c3149d1d229"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "HF-O",
  "x_element": "O"
}