{
  "counts": {
    "above_hull": 19,
    "entries": 81,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "EU",
    "SN"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-8138",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -2.3502549343512,
          "right": {
            "phase": "oqmd-1343565",
            "x": 0.3333333333333333
          },
          "slope": -2.3502549343512,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.0
        },
        {
          "intercept": -0.6650081924999979,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1343565",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -0.6650081924999979,
          "mu_b_rel": -1.020238549351204,
          "right": {
            "phase": "oqmd-18833",
            "x": 0.5
          },
          "slope": -0.35523035685120624,
          "x_hi": 0.5,
          "x_lo": 0.3333333333333333
        },
        {
          "intercept": -1.1936876774999998,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-18833",
            "x": 0.5
          },
          "mu_a_rel": -1.1936876774999998,
          "mu_b_rel": -0.4915590643512022,
          "right": {
            "phase": "oqmd-1799759",
            "x": 0.625
          },
          "slope": 0.7021286131487976,
          "x_hi": 0.625,
          "x_lo": 0.5
        },
        {
          "intercept": -1.4714486274999983,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1799759",
            "x": 0.625
          },
          "mu_a_rel": -1.4714486274999983,
          "mu_b_rel": -0.32490249435120333,
          "right": {
            "phase": "oqmd-18834",
            "x": 0.75
          },
          "slope": 1.146546133148795,
          "x_hi": 0.75,
          "x_lo": 0.625
        },
        {
          "intercept": -2.446156110553608,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-18834",
            "x": 0.75
          },
          "mu_a_rel": -2.446156110553608,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Sn",
            "x": 1.0
          },
          "slope": 2.446156110553608,
          "x_hi": 1.0,
          "x_lo": 0.75
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -1.8875732,
          "entries_at_x": 19,
          "formula": "Eu1",
          "nsites": 1,
          "phase": "oqmd-8138",
          "phase_kind": "structure",
          "spacegroup_number": 229,
          "spacegroup_symbol": "Im-3m",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.7834183114504,
          "energy_per_atom": -3.34649808583333,
          "entries_at_x": 4,
          "formula": "Eu2 Sn1",
          "nsites": 12,
          "phase": "oqmd-1343565",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": true,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.842623370925601,
          "energy_per_atom": -3.7434564325,
          "entries_at_x": 9,
          "formula": "Eu1 Sn1",
          "nsites": 4,
          "phase": "oqmd-18833",
          "phase_kind": "structure",
          "spacegroup_number": 63,
          "spacegroup_symbol": "Cmcm",
          "theoretical": false,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.7548572942820013,
          "energy_per_atom": -3.90900532125,
          "entries_at_x": 1,
          "formula": "Eu3 Sn5",
          "nsites": 16,
          "phase": "oqmd-1799759",
          "phase_kind": "structure",
          "spacegroup_number": 63,
          "spacegroup_symbol": "Cmcm",
          "theoretical": true,
          "x": 0.625
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.611539027638402,
          "energy_per_atom": -4.01900202,
          "entries_at_x": 5,
          "formula": "Eu1 Sn3",
          "nsites": 4,
          "phase": "oqmd-18834",
          "phase_kind": "structure",
          "spacegroup_number": 221,
          "spacegroup_symbol": "Pm-3m",
          "theoretical": false,
          "x": 0.75
        },
        {
          "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": 0.0005989258333340963,
    "only_mp_stable": [
      "oqmd-ref-Eu"
    ],
    "only_ours_stable": [
      "oqmd-1343565",
      "oqmd-18834"
    ],
    "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": "EU-SN",
  "x_element": "SN"
}
