{
  "counts": {
    "above_hull": 28,
    "entries": 80,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "PB",
    "Y"
  ],
  "flags": [
    "degenerate_endpoints",
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-ref-Pb",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -1.1891910050000003,
          "right": {
            "phase": "oqmd-1472186",
            "x": 0.3
          },
          "slope": -1.1891910050000003,
          "x_hi": 0.3,
          "x_lo": 0.0
        },
        {
          "intercept": -0.012312719999997779,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1472186",
            "x": 0.3
          },
          "mu_a_rel": -0.012312719999997779,
          "mu_b_rel": -1.1604613250000053,
          "right": {
            "phase": "oqmd-17933",
            "x": 0.3333333333333333
          },
          "slope": -1.1481486050000076,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.3
        },
        {
          "intercept": -0.11212986541666747,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-17933",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -0.11212986541666747,
          "mu_b_rel": -0.960827034166666,
          "right": {
            "phase": "oqmd-90624",
            "x": 0.5555555555555556
          },
          "slope": -0.8486971687499986,
          "x_hi": 0.5555555555555556,
          "x_lo": 0.3333333333333333
        },
        {
          "intercept": -0.5195640374999921,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-90624",
            "x": 0.5555555555555556
          },
          "mu_a_rel": -0.5195640374999921,
          "mu_b_rel": -0.6348796965000064,
          "right": {
            "phase": "oqmd-30931",
            "x": 0.625
          },
          "slope": -0.11531565900001425,
          "x_hi": 0.625,
          "x_lo": 0.5555555555555556
        },
        {
          "intercept": -1.5776968650000027,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-30931",
            "x": 0.625
          },
          "mu_a_rel": -1.5776968650000027,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Y",
            "x": 1.0
          },
          "slope": 1.5776968650000027,
          "x_hi": 1.0,
          "x_lo": 0.625
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": 0.0,
              "phase": "oqmd-1214556"
            }
          ],
          "energy": 0.0,
          "energy_per_atom": -3.703965,
          "entries_at_x": 22,
          "formula": "Pb",
          "nsites": null,
          "phase": "oqmd-ref-Pb",
          "phase_kind": "structure",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.35675730150000007,
          "energy_per_atom": -4.88885888,
          "entries_at_x": 2,
          "formula": "Pb7 Y3",
          "nsites": 10,
          "phase": "oqmd-1472186",
          "phase_kind": "structure",
          "spacegroup_number": 65,
          "spacegroup_symbol": "Cmmm",
          "theoretical": true,
          "x": 0.3
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.395028921666667,
          "energy_per_atom": -5.01914569333333,
          "entries_at_x": 4,
          "formula": "Pb2 Y1",
          "nsites": 6,
          "phase": "oqmd-17933",
          "phase_kind": "structure",
          "spacegroup_number": 38,
          "spacegroup_symbol": "Amm2",
          "theoretical": false,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.5836282925,
          "energy_per_atom": -5.82117968527778,
          "entries_at_x": 1,
          "formula": "Pb4 Y5",
          "nsites": 36,
          "phase": "oqmd-90624",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.5555555555555556
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.591636324375001,
          "energy_per_atom": -6.02088603625,
          "entries_at_x": 1,
          "formula": "Pb3 Y5",
          "nsites": 16,
          "phase": "oqmd-30931",
          "phase_kind": "structure",
          "spacegroup_number": 193,
          "spacegroup_symbol": "P63/mcm",
          "theoretical": false,
          "x": 0.625
        },
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": 0.0,
              "phase": "oqmd-2030142"
            }
          ],
          "energy": 0.0,
          "energy_per_atom": -6.465211305,
          "entries_at_x": 25,
          "formula": "Y",
          "nsites": null,
          "phase": "oqmd-ref-Y",
          "phase_kind": "structure",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "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": 2.8324144141222973e-09,
    "only_mp_stable": [
      "oqmd-51193"
    ],
    "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": "PB-Y",
  "x_element": "Y"
}
