{
  "counts": {
    "above_hull": 16,
    "entries": 93,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "B",
    "NI"
  ],
  "flags": [
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-620379",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -0.49593306187500075,
          "right": {
            "phase": "oqmd-4593",
            "x": 0.5714285714285714
          },
          "slope": -0.49593306187500075,
          "x_hi": 0.5714285714285714,
          "x_lo": 0.0
        },
        {
          "intercept": -0.21934992750000298,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-4593",
            "x": 0.5714285714285714
          },
          "mu_a_rel": -0.21934992750000298,
          "mu_b_rel": -0.33142061624999847,
          "right": {
            "phase": "oqmd-7800",
            "x": 0.6666666666666666
          },
          "slope": -0.11207068874999548,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.5714285714285714
        },
        {
          "intercept": -0.4575457899999863,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-7800",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -0.4575457899999863,
          "mu_b_rel": -0.21232268500000684,
          "right": {
            "phase": "oqmd-1989009",
            "x": 0.7142857142857143
          },
          "slope": 0.24522310499997946,
          "x_hi": 0.7142857142857143,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -0.5928537900000203,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1989009",
            "x": 0.7142857142857143
          },
          "mu_a_rel": -0.5928537900000203,
          "mu_b_rel": -0.1581994849999932,
          "right": {
            "phase": "oqmd-4592",
            "x": 0.75
          },
          "slope": 0.43465430500002705,
          "x_hi": 0.75,
          "x_lo": 0.7142857142857143
        },
        {
          "intercept": -1.067452245,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-4592",
            "x": 0.75
          },
          "mu_a_rel": -1.067452245,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-ref-Ni",
            "x": 1.0
          },
          "slope": 1.067452245,
          "x_hi": 1.0,
          "x_lo": 0.75
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -6.67796758,
          "entries_at_x": 29,
          "formula": "B1",
          "nsites": 12,
          "phase": "oqmd-620379",
          "phase_kind": "structure",
          "spacegroup_number": 166,
          "spacegroup_symbol": "R-3m",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.283390321071429,
          "energy_per_atom": -6.32630186678571,
          "entries_at_x": 2,
          "formula": "B3 Ni4",
          "nsites": 28,
          "phase": "oqmd-4593",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.5714285714285714
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.29406372,
          "energy_per_atom": -6.23113259333333,
          "entries_at_x": 6,
          "formula": "B1 Ni2",
          "nsites": 6,
          "phase": "oqmd-7800",
          "phase_kind": "structure",
          "spacegroup_number": 140,
          "spacegroup_symbol": "I4/mcm",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.2823864292857152,
          "energy_per_atom": -6.166533966428572,
          "entries_at_x": 1,
          "formula": "B2 Ni5",
          "nsites": 14,
          "phase": "oqmd-1989009",
          "phase_kind": "structure",
          "spacegroup_number": 15,
          "spacegroup_symbol": "C2/c",
          "theoretical": true,
          "x": 0.7142857142857143
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.26686306125,
          "energy_per_atom": -6.11131959625,
          "entries_at_x": 5,
          "formula": "B1 Ni3",
          "nsites": 16,
          "phase": "oqmd-4592",
          "phase_kind": "structure",
          "spacegroup_number": 62,
          "spacegroup_symbol": "Pnma",
          "theoretical": false,
          "x": 0.75
        },
        {
          "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-B"
    ],
    "only_ours_stable": [
      "oqmd-1989009"
    ],
    "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": "B-NI",
  "x_element": "NI"
}