{
  "counts": {
    "above_hull": 35,
    "entries": 133,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "PD",
    "SN"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-ref-Pd",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -2.3556799768512,
          "right": {
            "phase": "oqmd-2131641",
            "x": 0.14285714285714285
          },
          "slope": -2.3556799768512,
          "x_hi": 0.14285714285714285,
          "x_lo": 0.0
        },
        {
          "intercept": -0.06333547499999892,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2131641",
            "x": 0.14285714285714285
          },
          "mu_a_rel": -0.06333547499999892,
          "mu_b_rel": -1.975667126851206,
          "right": {
            "phase": "oqmd-2170055",
            "x": 0.25
          },
          "slope": -1.9123316518512072,
          "x_hi": 0.25,
          "x_lo": 0.14285714285714285
        },
        {
          "intercept": -0.441845097500001,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2170055",
            "x": 0.25
          },
          "mu_a_rel": -0.441845097500001,
          "mu_b_rel": -0.8401382593512,
          "right": {
            "phase": "oqmd-7830",
            "x": 0.3333333333333333
          },
          "slope": -0.398293161851199,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.25
        },
        {
          "intercept": -0.5286478824999963,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-7830",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -0.5286478824999963,
          "mu_b_rel": -0.6665326893512094,
          "right": {
            "phase": "oqmd-2132151",
            "x": 0.375
          },
          "slope": -0.13788480685121302,
          "x_hi": 0.375,
          "x_lo": 0.3333333333333333
        },
        {
          "intercept": -0.5855951462500018,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2132151",
            "x": 0.375
          },
          "mu_a_rel": -0.5855951462500018,
          "mu_b_rel": -0.5716205831012002,
          "right": {
            "phase": "oqmd-17950",
            "x": 0.5
          },
          "slope": 0.013974563148801522,
          "x_hi": 0.5,
          "x_lo": 0.375
        },
        {
          "intercept": -0.95745068,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-17950",
            "x": 0.5
          },
          "mu_a_rel": -0.95745068,
          "mu_b_rel": -0.19976504935120187,
          "right": {
            "phase": "oqmd-2029391",
            "x": 0.6666666666666666
          },
          "slope": 0.7576856306487981,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.5
        },
        {
          "intercept": -1.1613785449999974,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2029391",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -1.1613785449999974,
          "mu_b_rel": -0.09780111685120318,
          "right": {
            "phase": "oqmd-17952",
            "x": 0.8
          },
          "slope": 1.0635774281487942,
          "x_hi": 0.8,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -1.5525830124048106,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-17952",
            "x": 0.8
          },
          "mu_a_rel": -1.5525830124048106,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Sn",
            "x": 1.0
          },
          "slope": 1.5525830124048106,
          "x_hi": 1.0,
          "x_lo": 0.8
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -5.176718,
          "entries_at_x": 31,
          "formula": "Pd",
          "nsites": null,
          "phase": "oqmd-ref-Pd",
          "phase_kind": "structure",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.3365257109787428,
          "energy_per_atom": -5.332868922857143,
          "entries_at_x": 1,
          "formula": "Pd6 Sn1",
          "nsites": 7,
          "phase": "oqmd-2131641",
          "phase_kind": "structure",
          "spacegroup_number": 1,
          "spacegroup_symbol": "P1",
          "theoretical": true,
          "x": 0.14285714285714285
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.5414183879628007,
          "energy_per_atom": -5.40248031375,
          "entries_at_x": 10,
          "formula": "Pd3 Sn1",
          "nsites": 8,
          "phase": "oqmd-2170055",
          "phase_kind": "structure",
          "spacegroup_number": 12,
          "spacegroup_symbol": "C2/m",
          "theoretical": true,
          "x": 0.25
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.574609484783734,
          "energy_per_atom": -5.3304526325,
          "entries_at_x": 6,
          "formula": "Pd2 Sn1",
          "nsites": 12,
          "phase": "oqmd-7830",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.5803546850692012,
          "energy_per_atom": -5.28358844375,
          "entries_at_x": 2,
          "formula": "Pd5 Sn3",
          "nsites": 16,
          "phase": "oqmd-2132151",
          "phase_kind": "structure",
          "spacegroup_number": 5,
          "spacegroup_symbol": "C2",
          "theoretical": true,
          "x": 0.375
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.578607864675601,
          "energy_per_atom": -5.12401345625,
          "entries_at_x": 8,
          "formula": "Pd1 Sn1",
          "nsites": 8,
          "phase": "oqmd-17950",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.4523269262341347,
          "energy_per_atom": -4.7872949616666665,
          "entries_at_x": 5,
          "formula": "Pd1 Sn2",
          "nsites": 12,
          "phase": "oqmd-2029391",
          "phase_kind": "structure",
          "spacegroup_number": 64,
          "spacegroup_symbol": "Cmca",
          "theoretical": true,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.310516602480962,
          "energy_per_atom": -4.477134593,
          "entries_at_x": 2,
          "formula": "Pd1 Sn4",
          "nsites": 10,
          "phase": "oqmd-17952",
          "phase_kind": "structure",
          "spacegroup_number": 41,
          "spacegroup_symbol": "Aba2",
          "theoretical": false,
          "x": 0.8
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -4.007039,
          "entries_at_x": 28,
          "formula": "Sn",
          "nsites": null,
          "phase": "oqmd-ref-Sn",
          "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": 1.2276249999665367e-05,
    "only_mp_stable": [],
    "only_ours_stable": [
      "oqmd-2170055"
    ],
    "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": "PD-SN",
  "x_element": "SN"
}
