{
  "counts": {
    "above_hull": 29,
    "entries": 149,
    "intervals": 6,
    "vertices": 7
  },
  "elements": [
    "O",
    "ZR"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-20034",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -10.898947291757521,
          "right": {
            "phase": "oqmd-3278",
            "x": 0.3333333333333333
          },
          "slope": -10.898947291757521,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.0
        },
        {
          "intercept": -5.261837225878766,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-3278",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -5.261837225878766,
          "mu_b_rel": -0.3752728399999885,
          "right": {
            "phase": "oqmd-2030406",
            "x": 0.5
          },
          "slope": 4.886564385878778,
          "x_hi": 0.5,
          "x_lo": 0.3333333333333333
        },
        {
          "intercept": -5.472218825878752,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2030406",
            "x": 0.5
          },
          "mu_a_rel": -5.472218825878752,
          "mu_b_rel": -0.164891240000002,
          "right": {
            "phase": "oqmd-2030404",
            "x": 0.6666666666666666
          },
          "slope": 5.30732758587875,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.5
        },
        {
          "intercept": -5.575887365878748,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2030404",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -5.575887365878748,
          "mu_b_rel": -0.11305697000000503,
          "right": {
            "phase": "oqmd-5214",
            "x": 0.75
          },
          "slope": 5.4628303958787425,
          "x_hi": 0.75,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -5.83558933087877,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-5214",
            "x": 0.75
          },
          "mu_a_rel": -5.83558933087877,
          "mu_b_rel": -0.026489648333329896,
          "right": {
            "phase": "oqmd-2132007",
            "x": 0.8571428571428571
          },
          "slope": 5.80909968254544,
          "x_hi": 0.8571428571428571,
          "x_lo": 0.75
        },
        {
          "intercept": -5.99452722087875,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2132007",
            "x": 0.8571428571428571
          },
          "mu_a_rel": -5.99452722087875,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-67408",
            "x": 1.0
          },
          "slope": 5.99452722087875,
          "x_hi": 1.0,
          "x_lo": 0.8571428571428571
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -4.84445622625,
          "entries_at_x": 29,
          "formula": "O1",
          "nsites": 8,
          "phase": "oqmd-20034",
          "phase_kind": "structure",
          "spacegroup_number": 12,
          "spacegroup_symbol": "C2/m",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -3.63298243058584,
          "energy_per_atom": -9.49757019,
          "entries_at_x": 32,
          "formula": "O2 Zr1",
          "nsites": 12,
          "phase": "oqmd-3278",
          "phase_kind": "structure",
          "spacegroup_number": 14,
          "spacegroup_symbol": "P21/c",
          "theoretical": false,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -2.818555032939377,
          "energy_per_atom": -9.35378894,
          "entries_at_x": 6,
          "formula": "O1 Zr1",
          "nsites": 6,
          "phase": "oqmd-2030406",
          "phase_kind": "structure",
          "spacegroup_number": 189,
          "spacegroup_symbol": "P-62m",
          "theoretical": true,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.9340004352929188,
          "energy_per_atom": -9.139880490000001,
          "entries_at_x": 4,
          "formula": "O1 Zr2",
          "nsites": 9,
          "phase": "oqmd-2030404",
          "phase_kind": "structure",
          "spacegroup_number": 162,
          "spacegroup_symbol": "P-31m",
          "theoretical": true,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.47876456896969,
          "energy_per_atom": -9.0199676975,
          "entries_at_x": 7,
          "formula": "O1 Zr3",
          "nsites": 8,
          "phase": "oqmd-5214",
          "phase_kind": "structure",
          "spacegroup_number": 167,
          "spacegroup_symbol": "R-3c",
          "theoretical": false,
          "x": 0.75
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.8563610315541074,
          "energy_per_atom": -8.828693826428571,
          "entries_at_x": 1,
          "formula": "O1 Zr6",
          "nsites": 14,
          "phase": "oqmd-2132007",
          "phase_kind": "structure",
          "spacegroup_number": 163,
          "spacegroup_symbol": "P-31c",
          "theoretical": true,
          "x": 0.8571428571428571
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -8.54717235,
          "entries_at_x": 30,
          "formula": "Zr1",
          "nsites": 2,
          "phase": "oqmd-67408",
          "phase_kind": "structure",
          "spacegroup_number": 194,
          "spacegroup_symbol": "P63/mmc",
          "theoretical": false,
          "x": 1.0
        }
      ]
    }
  ],
  "mp_agreement": {
    "comparable": false,
    "comparable_note": "is_stable is derived by the extraction, not an upstream flag, so comparing it against a hull recomputed from the same energies tests the derivation rather than the data",
    "max_abs_delta_energy_above_hull": 0.0001719050000001943,
    "only_mp_stable": [
      "oqmd-758445",
      "oqmd-ref-O",
      "oqmd-ref-Zr"
    ],
    "only_ours_stable": [],
    "stable_sets_match": false
  },
  "provenance": {
    "above_hull_window_eV": 0.05,
    "builder_version": 1,
    "collinear_tol": 1e-12,
    "correction_model": "OQMD fit-partial ('standard' fit, applied upstream by OQMD; none added)",
    "degenerate_tol": 1e-06,
    "entry_pool": "all_nondeprecated",
    "is_stable_source": "derived",
    "observed_at": "2026-09-05T17:02:03Z",
    "snapshot_scope_elements": [],
    "snapshot_scope_kind": "full",
    "snapshot_sha256": "2a9393262c52ec35600424236c352a4cdb3291c8b25c1c6588f5e62abe8e0d8d",
    "source_release": "qmdb_v1_8_022026",
    "stability_tol": 0.0001,
    "thermo_type": "standard",
    "upstream_energy_corrections": "OQMD 'standard' fit (fit-partial of Kirklin et al. 2015): elemental reference energies of a subset of elements fitted to experimental formation enthalpies, applied by OQMD"
  },
  "reference": {
    "kind": "dft_fitted_elemental_reference_0K",
    "per": "atom",
    "temperature_K": 0.0,
    "units": "eV/atom"
  },
  "schema_version": 1,
  "system_id": "O-ZR",
  "x_element": "ZR"
}