{
  "counts": {
    "above_hull": 16,
    "entries": 132,
    "intervals": 4,
    "vertices": 5
  },
  "elements": [
    "BI",
    "O"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-640404",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -2.45671254337875,
          "right": {
            "phase": "oqmd-36558",
            "x": 0.6
          },
          "slope": -2.45671254337875,
          "x_hi": 0.6,
          "x_lo": 0.0
        },
        {
          "intercept": -2.708720786249925,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-36558",
            "x": 0.6
          },
          "mu_a_rel": -2.708720786249925,
          "mu_b_rel": -0.6508986858787993,
          "right": {
            "phase": "oqmd-646777",
            "x": 0.6363636363636364
          },
          "slope": 2.057822100371126,
          "x_hi": 0.6363636363636364,
          "x_lo": 0.6
        },
        {
          "intercept": -3.7942772074999613,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-646777",
            "x": 0.6363636363636364
          },
          "mu_a_rel": -3.7942772074999613,
          "mu_b_rel": -0.030580730878778883,
          "right": {
            "phase": "oqmd-14331",
            "x": 0.6666666666666666
          },
          "slope": 3.7636964766211825,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.6363636363636364
        },
        {
          "intercept": -3.855438669257519,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-14331",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -3.855438669257519,
          "mu_b_rel": 4.440892098500626e-16,
          "right": {
            "phase": "oqmd-20034",
            "x": 1.0
          },
          "slope": 3.8554386692575195,
          "x_hi": 1.0,
          "x_lo": 0.6666666666666666
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -4.038931855,
          "entries_at_x": 33,
          "formula": "Bi1",
          "nsites": 2,
          "phase": "oqmd-640404",
          "phase_kind": "structure",
          "spacegroup_number": 166,
          "spacegroup_symbol": "R-3m",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.47402752602725,
          "energy_per_atom": -5.8035775465,
          "entries_at_x": 32,
          "formula": "Bi2 O3",
          "nsites": 20,
          "phase": "oqmd-36558",
          "phase_kind": "structure",
          "spacegroup_number": 14,
          "spacegroup_symbol": "P21/c",
          "theoretical": false,
          "x": 0.6
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.3991976314683,
          "energy_per_atom": -5.74636087409091,
          "entries_at_x": 5,
          "formula": "Bi4 O7",
          "nsites": 22,
          "phase": "oqmd-646777",
          "phase_kind": "structure",
          "spacegroup_number": 2,
          "spacegroup_symbol": "P-1",
          "theoretical": false,
          "x": 0.6363636363636364
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -1.28514622308584,
          "energy_per_atom": -5.64698715083333,
          "entries_at_x": 4,
          "formula": "Bi1 O2",
          "nsites": 12,
          "phase": "oqmd-14331",
          "phase_kind": "structure",
          "spacegroup_number": 15,
          "spacegroup_symbol": "C2/c",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "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": 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": 6.551233333595974e-09,
    "only_mp_stable": [
      "oqmd-ref-Bi",
      "oqmd-ref-O"
    ],
    "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": "BI-O",
  "x_element": "O"
}