{
  "counts": {
    "above_hull": 18,
    "entries": 81,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "EU",
    "NI"
  ],
  "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": -0.741142120000001,
          "right": {
            "phase": "oqmd-1821772",
            "x": 0.2857142857142857
          },
          "slope": -0.741142120000001,
          "x_hi": 0.2857142857142857,
          "x_lo": 0.0
        },
        {
          "intercept": -0.074728033333334,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1821772",
            "x": 0.2857142857142857
          },
          "mu_a_rel": -0.074728033333334,
          "mu_b_rel": -0.554322036666666,
          "right": {
            "phase": "oqmd-1366256",
            "x": 0.5
          },
          "slope": -0.479594003333332,
          "x_hi": 0.5,
          "x_lo": 0.2857142857142857
        },
        {
          "intercept": -0.0824785099999999,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1366256",
            "x": 0.5
          },
          "mu_a_rel": -0.0824785099999999,
          "mu_b_rel": -0.5465715600000001,
          "right": {
            "phase": "oqmd-1365595",
            "x": 0.6
          },
          "slope": -0.46409305000000023,
          "x_hi": 0.6,
          "x_lo": 0.5
        },
        {
          "intercept": -0.0936862100000011,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1365595",
            "x": 0.6
          },
          "mu_a_rel": -0.0936862100000011,
          "mu_b_rel": -0.5390997599999994,
          "right": {
            "phase": "oqmd-1591127",
            "x": 0.6666666666666666
          },
          "slope": -0.4454135499999982,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.6
        },
        {
          "intercept": -1.0098851500000021,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1591127",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -1.0098851500000021,
          "mu_b_rel": -0.08100028999999864,
          "right": {
            "phase": "oqmd-1787018",
            "x": 0.75
          },
          "slope": 0.9288848600000035,
          "x_hi": 0.75,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -1.1537960799999702,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1787018",
            "x": 0.75
          },
          "mu_a_rel": -1.1537960799999702,
          "mu_b_rel": -0.03302998000000934,
          "right": {
            "phase": "oqmd-1791786",
            "x": 0.7777777777777778
          },
          "slope": 1.120766099999961,
          "x_hi": 0.7777777777777778,
          "x_lo": 0.75
        },
        {
          "intercept": -1.164697716666671,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1791786",
            "x": 0.7777777777777778
          },
          "mu_a_rel": -1.164697716666671,
          "mu_b_rel": -0.02991522666666624,
          "right": {
            "phase": "oqmd-30109",
            "x": 0.8333333333333334
          },
          "slope": 1.1347824900000048,
          "x_hi": 0.8333333333333334,
          "x_lo": 0.7777777777777778
        },
        {
          "intercept": -1.3142738500000024,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-30109",
            "x": 0.8333333333333334
          },
          "mu_a_rel": -1.3142738500000024,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Ni",
            "x": 1.0
          },
          "slope": 1.3142738500000024,
          "x_hi": 1.0,
          "x_lo": 0.8333333333333334
        }
      ],
      "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": -0.2117548914285717,
          "energy_per_atom": -3.150484182857143,
          "entries_at_x": 1,
          "formula": "Eu5 Ni2",
          "nsites": 14,
          "phase": "oqmd-1821772",
          "phase_kind": "structure",
          "spacegroup_number": 15,
          "spacegroup_symbol": "C2/c",
          "theoretical": true,
          "x": 0.2857142857142857
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.314525035,
          "energy_per_atom": -4.041621395,
          "entries_at_x": 8,
          "formula": "Eu1 Ni1",
          "nsites": 8,
          "phase": "oqmd-1366256",
          "phase_kind": "structure",
          "spacegroup_number": 194,
          "spacegroup_symbol": "P63/mmc",
          "theoretical": true,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.36093434,
          "energy_per_atom": -4.455935332,
          "entries_at_x": 3,
          "formula": "Eu2 Ni3",
          "nsites": 10,
          "phase": "oqmd-1365595",
          "phase_kind": "structure",
          "spacegroup_number": 64,
          "spacegroup_symbol": "Cmca",
          "theoretical": true,
          "x": 0.6
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.39062857666666656,
          "energy_per_atom": -4.730899323333333,
          "entries_at_x": 3,
          "formula": "Eu1 Ni2",
          "nsites": 6,
          "phase": "oqmd-1591127",
          "phase_kind": "structure",
          "spacegroup_number": 227,
          "spacegroup_symbol": "Fd-3m",
          "theoretical": true,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.31322150499999957,
          "energy_per_atom": -4.960079445,
          "entries_at_x": 5,
          "formula": "Eu1 Ni3",
          "nsites": 12,
          "phase": "oqmd-1787018",
          "phase_kind": "structure",
          "spacegroup_number": 166,
          "spacegroup_symbol": "R-3m",
          "theoretical": true,
          "x": 0.75
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.282089113333334,
          "energy_per_atom": -5.0311427844444445,
          "entries_at_x": 1,
          "formula": "Eu2 Ni7",
          "nsites": 18,
          "phase": "oqmd-1791786",
          "phase_kind": "structure",
          "spacegroup_number": 166,
          "spacegroup_symbol": "R-3m",
          "theoretical": true,
          "x": 0.7777777777777778
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.219045641666667,
          "energy_per_atom": -5.172490775,
          "entries_at_x": 1,
          "formula": "Eu1 Ni5",
          "nsites": 6,
          "phase": "oqmd-30109",
          "phase_kind": "structure",
          "spacegroup_number": 191,
          "spacegroup_symbol": "P6/mmm",
          "theoretical": false,
          "x": 0.8333333333333334
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -5.56662,
          "entries_at_x": 29,
          "formula": "Ni",
          "nsites": null,
          "phase": "oqmd-ref-Ni",
          "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": 0.0011435100000003475,
    "only_mp_stable": [
      "oqmd-ref-Eu"
    ],
    "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": "EU-NI",
  "x_element": "NI"
}