{
  "counts": {
    "above_hull": 28,
    "entries": 108,
    "intervals": 4,
    "vertices": 5
  },
  "elements": [
    "NB",
    "ZN"
  ],
  "flags": [
    "degenerate_endpoints",
    "has_intermediate_compounds",
    "mp_agreement_not_comparable"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-ref-Nb",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -0.25473126142857155,
          "right": {
            "phase": "oqmd-30791",
            "x": 0.5384615384615384
          },
          "slope": -0.25473126142857155,
          "x_hi": 0.5384615384615384,
          "x_lo": 0.0
        },
        {
          "intercept": -0.05108908924999753,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-30791",
            "x": 0.5384615384615384
          },
          "mu_a_rel": -0.05108908924999753,
          "mu_b_rel": -0.21094061350000226,
          "right": {
            "phase": "oqmd-17758",
            "x": 0.6666666666666666
          },
          "slope": -0.15985152425000473,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.5384615384615384
        },
        {
          "intercept": -0.11147234875000608,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-17758",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -0.11147234875000608,
          "mu_b_rel": -0.18074898374999798,
          "right": {
            "phase": "oqmd-17759",
            "x": 0.75
          },
          "slope": -0.0692766349999919,
          "x_hi": 0.75,
          "x_lo": 0.6666666666666666
        },
        {
          "intercept": -0.6537193,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-17759",
            "x": 0.75
          },
          "mu_a_rel": -0.6537193,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "oqmd-122929",
            "x": 1.0
          },
          "slope": 0.6537193,
          "x_hi": 1.0,
          "x_lo": 0.75
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": 0.0,
              "phase": "oqmd-1215170"
            },
            {
              "energy": 0.0,
              "phase": "oqmd-1521870"
            },
            {
              "energy": 0.0,
              "phase": "oqmd-1521875"
            }
          ],
          "energy": 0.0,
          "energy_per_atom": -10.094018329999999,
          "entries_at_x": 25,
          "formula": "Nb",
          "nsites": null,
          "phase": "oqmd-ref-Nb",
          "phase_kind": "structure",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.137162986923077,
          "energy_per_atom": -5.47759836846154,
          "entries_at_x": 1,
          "formula": "Nb6 Zn7",
          "nsites": 13,
          "phase": "oqmd-30791",
          "phase_kind": "structure",
          "spacegroup_number": 166,
          "spacegroup_symbol": "R-3m",
          "theoretical": false,
          "x": 0.5384615384615384
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.157656772083334,
          "energy_per_atom": -4.36631199208333,
          "entries_at_x": 8,
          "formula": "Nb1 Zn2",
          "nsites": 24,
          "phase": "oqmd-17758",
          "phase_kind": "structure",
          "spacegroup_number": 194,
          "spacegroup_symbol": "P63/mmc",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.163429825,
          "energy_per_atom": -3.63642794,
          "entries_at_x": 5,
          "formula": "Nb1 Zn3",
          "nsites": 4,
          "phase": "oqmd-17759",
          "phase_kind": "structure",
          "spacegroup_number": 221,
          "spacegroup_symbol": "Pm-3m",
          "theoretical": false,
          "x": 0.75
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -1.2660268,
          "entries_at_x": 31,
          "formula": "Zn1",
          "nsites": 2,
          "phase": "oqmd-122929",
          "phase_kind": "structure",
          "spacegroup_number": 194,
          "spacegroup_symbol": "P63/mmc",
          "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": 7.00413588239357e-10,
    "only_mp_stable": [
      "oqmd-685533",
      "oqmd-ref-Zn"
    ],
    "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": "NB-ZN",
  "x_element": "ZN"
}
