{
  "counts": {
    "above_hull": 24,
    "entries": 83,
    "intervals": 10,
    "vertices": 11
  },
  "elements": [
    "ND",
    "SN"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-8137",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -1.941277575184536,
          "right": {
            "phase": "oqmd-647405",
            "x": 0.375
          },
          "slope": -1.941277575184536,
          "x_hi": 0.375,
          "x_lo": 0.0
        },
        {
          "intercept": -0.3242755999999996,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-647405",
            "x": 0.375
          },
          "mu_a_rel": -0.3242755999999996,
          "mu_b_rel": -1.4008182418512032,
          "right": {
            "phase": "oqmd-1479301",
            "x": 0.42857142857142855
          },
          "slope": -1.0765426418512036,
          "x_hi": 0.42857142857142855,
          "x_lo": 0.375
        },
        {
          "intercept": -0.38416056500000384,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1479301",
            "x": 0.42857142857142855
          },
          "mu_a_rel": -0.38416056500000384,
          "mu_b_rel": -1.3209716218511975,
          "right": {
            "phase": "oqmd-96178",
            "x": 0.4444444444444444
          },
          "slope": -0.9368110568511937,
          "x_hi": 0.4444444444444444,
          "x_lo": 0.42857142857142855
        },
        {
          "intercept": -0.5243391250000016,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-96178",
            "x": 0.4444444444444444
          },
          "mu_a_rel": -0.5243391250000016,
          "mu_b_rel": -1.1457484218512004,
          "right": {
            "phase": "oqmd-1370925",
            "x": 0.5
          },
          "slope": -0.6214092968511988,
          "x_hi": 0.5,
          "x_lo": 0.4444444444444444
        },
        {
          "intercept": -1.2238643100000002,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1370925",
            "x": 0.5
          },
          "mu_a_rel": -1.2238643100000002,
          "mu_b_rel": -0.4462232368512018,
          "right": {
            "phase": "oqmd-25721",
            "x": 0.6
          },
          "slope": 0.7776410731487984,
          "x_hi": 0.6,
          "x_lo": 0.5
        },
        {
          "intercept": -1.2735853950000022,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-25721",
            "x": 0.6
          },
          "mu_a_rel": -1.2735853950000022,
          "mu_b_rel": -0.41307584685120025,
          "right": {
            "phase": "oqmd-647404",
            "x": 0.6666666666666666
          },
          "slope": 0.860509548148802,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.6
        },
        {
          "intercept": -1.5298177749999935,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-647404",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -1.5298177749999935,
          "mu_b_rel": -0.28495965685120495,
          "right": {
            "phase": "oqmd-1453997",
            "x": 0.7
          },
          "slope": 1.2448581181487886,
          "x_hi": 0.7,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -1.8313281799999999,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1453997",
            "x": 0.7
          },
          "mu_a_rel": -1.8313281799999999,
          "mu_b_rel": -0.1557409118512021,
          "right": {
            "phase": "oqmd-1789531",
            "x": 0.7142857142857143
          },
          "slope": 1.6755872681487978,
          "x_hi": 0.7142857142857143,
          "x_lo": 0.7
        },
        {
          "intercept": -1.9116660299999895,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1789531",
            "x": 0.7142857142857143
          },
          "mu_a_rel": -1.9116660299999895,
          "mu_b_rel": -0.12360577185120603,
          "right": {
            "phase": "oqmd-1369547",
            "x": 0.75
          },
          "slope": 1.7880602581487834,
          "x_hi": 0.75,
          "x_lo": 0.7142857142857143
        },
        {
          "intercept": -2.282483345553608,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1369547",
            "x": 0.75
          },
          "mu_a_rel": -2.282483345553608,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Sn",
            "x": 1.0
          },
          "slope": 2.282483345553608,
          "x_hi": 1.0,
          "x_lo": 0.75
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -4.762916335,
          "entries_at_x": 19,
          "formula": "Nd1",
          "nsites": 4,
          "phase": "oqmd-8137",
          "phase_kind": "structure",
          "spacegroup_number": 194,
          "spacegroup_symbol": "P63/mmc",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.727979090694201,
          "energy_per_atom": -5.17258664625,
          "entries_at_x": 3,
          "formula": "Nd5 Sn3",
          "nsites": 16,
          "phase": "oqmd-647405",
          "phase_kind": "structure",
          "spacegroup_number": 193,
          "spacegroup_symbol": "P63/mcm",
          "theoretical": false,
          "x": 0.375
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.7856510179362297,
          "energy_per_atom": -5.184785890714286,
          "entries_at_x": 1,
          "formula": "Nd4 Sn3",
          "nsites": 14,
          "phase": "oqmd-1479301",
          "phase_kind": "structure",
          "spacegroup_number": 220,
          "spacegroup_symbol": "I-43d",
          "theoretical": true,
          "x": 0.42857142857142855
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.8005210347116455,
          "energy_per_atom": -5.18618252,
          "entries_at_x": 2,
          "formula": "Nd5 Sn4",
          "nsites": 36,
          "phase": "oqmd-96178",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.4444444444444444
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.835043773425601,
          "energy_per_atom": -5.1735484025,
          "entries_at_x": 8,
          "formula": "Nd1 Sn1",
          "nsites": 4,
          "phase": "oqmd-1370925",
          "phase_kind": "structure",
          "spacegroup_number": 63,
          "spacegroup_symbol": "Cmcm",
          "theoretical": true,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.7572796661107212,
          "energy_per_atom": -5.0109019539999995,
          "entries_at_x": 1,
          "formula": "Nd2 Sn3",
          "nsites": 20,
          "phase": "oqmd-25721",
          "phase_kind": "structure",
          "spacegroup_number": 2,
          "spacegroup_symbol": "P-1",
          "theoretical": false,
          "x": 0.6
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.699912362900801,
          "energy_per_atom": -4.89694642333333,
          "entries_at_x": 4,
          "formula": "Nd1 Sn2",
          "nsites": 6,
          "phase": "oqmd-647404",
          "phase_kind": "structure",
          "spacegroup_number": 65,
          "spacegroup_symbol": "Cmmm",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.6584170922958414,
          "energy_per_atom": -4.827157039,
          "entries_at_x": 1,
          "formula": "Nd3 Sn7",
          "nsites": 10,
          "phase": "oqmd-1453997",
          "phase_kind": "structure",
          "spacegroup_number": 65,
          "spacegroup_symbol": "Cmmm",
          "theoretical": true,
          "x": 0.7
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.6344801313222871,
          "energy_per_atom": -4.7910940292857145,
          "entries_at_x": 2,
          "formula": "Nd2 Sn5",
          "nsites": 14,
          "phase": "oqmd-1789531",
          "phase_kind": "structure",
          "spacegroup_number": 65,
          "spacegroup_symbol": "Cmmm",
          "theoretical": true,
          "x": 0.7142857142857143
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.570620836388402,
          "energy_per_atom": -4.6969196125,
          "entries_at_x": 5,
          "formula": "Nd1 Sn3",
          "nsites": 8,
          "phase": "oqmd-1369547",
          "phase_kind": "structure",
          "spacegroup_number": 63,
          "spacegroup_symbol": "Cmcm",
          "theoretical": true,
          "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": 2.426596978910567e-09,
    "only_mp_stable": [
      "oqmd-ref-Nd"
    ],
    "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": "ND-SN",
  "x_element": "SN"
}
