{
  "counts": {
    "above_hull": 22,
    "entries": 97,
    "intervals": 8,
    "vertices": 9
  },
  "elements": [
    "MO",
    "TA"
  ],
  "flags": [
    "degenerate_endpoints",
    "has_intermediate_compounds",
    "mp_agreement_not_comparable",
    "theoretical_vertices"
  ],
  "isotherms": [
    {
      "intervals": [
        {
          "intercept": 0.0,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-ref-Mo",
            "x": 0.0
          },
          "mu_a_rel": 0.0,
          "mu_b_rel": -0.5273967899999974,
          "right": {
            "phase": "oqmd-1916311",
            "x": 0.125
          },
          "slope": -0.5273967899999974,
          "x_hi": 0.125,
          "x_lo": 0.0
        },
        {
          "intercept": -0.0018730799999985837,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1916311",
            "x": 0.125
          },
          "mu_a_rel": -0.0018730799999985837,
          "mu_b_rel": -0.5142852300000074,
          "right": {
            "phase": "oqmd-1975029",
            "x": 0.3333333333333333
          },
          "slope": -0.5124121500000087,
          "x_hi": 0.3333333333333333,
          "x_lo": 0.125
        },
        {
          "intercept": -0.1293120800000025,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1975029",
            "x": 0.3333333333333333
          },
          "mu_a_rel": -0.1293120800000025,
          "mu_b_rel": -0.25940722999999954,
          "right": {
            "phase": "oqmd-306083",
            "x": 0.5
          },
          "slope": -0.13009514999999702,
          "x_hi": 0.5,
          "x_lo": 0.3333333333333333
        },
        {
          "intercept": -0.31954711000000224,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-306083",
            "x": 0.5
          },
          "mu_a_rel": -0.31954711000000224,
          "mu_b_rel": -0.06917219999999968,
          "right": {
            "phase": "oqmd-1975082",
            "x": 0.625
          },
          "slope": 0.25037491000000256,
          "x_hi": 0.625,
          "x_lo": 0.5
        },
        {
          "intercept": -0.3787887600000625,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-1975082",
            "x": 0.625
          },
          "mu_a_rel": -0.3787887600000625,
          "mu_b_rel": -0.03362720999996355,
          "right": {
            "phase": "oqmd-2131870",
            "x": 0.6363636363636364
          },
          "slope": 0.34516155000009896,
          "x_hi": 0.6363636363636364,
          "x_lo": 0.625
        },
        {
          "intercept": -0.41609227545454275,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2131870",
            "x": 0.6363636363636364
          },
          "mu_a_rel": -0.41609227545454275,
          "mu_b_rel": -0.012310915454546267,
          "right": {
            "phase": "oqmd-2131873",
            "x": 0.7272727272727273
          },
          "slope": 0.4037813599999965,
          "x_hi": 0.7272727272727273,
          "x_lo": 0.6363636363636364
        },
        {
          "intercept": -0.42127062999999504,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2131873",
            "x": 0.7272727272727273
          },
          "mu_a_rel": -0.42127062999999504,
          "mu_b_rel": -0.010369032500001707,
          "right": {
            "phase": "oqmd-2131555",
            "x": 0.8
          },
          "slope": 0.41090159749999333,
          "x_hi": 0.8,
          "x_lo": 0.7272727272727273
        },
        {
          "intercept": -0.4627467600000018,
          "kind": "two_phase",
          "left": {
            "phase": "oqmd-2131555",
            "x": 0.8
          },
          "mu_a_rel": -0.4627467600000018,
          "mu_b_rel": -5.551115123125783e-17,
          "right": {
            "phase": "oqmd-ref-Ta",
            "x": 1.0
          },
          "slope": 0.46274676000000176,
          "x_hi": 1.0,
          "x_lo": 0.8
        }
      ],
      "temperature_K": 0.0,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": -10.848084,
          "entries_at_x": 20,
          "formula": "Mo",
          "nsites": null,
          "phase": "oqmd-ref-Mo",
          "phase_kind": "structure",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.06592459874999967,
          "energy_per_atom": -11.0395641825,
          "entries_at_x": 2,
          "formula": "Mo7 Ta1",
          "nsites": 8,
          "phase": "oqmd-1916311",
          "phase_kind": "structure",
          "spacegroup_number": 123,
          "spacegroup_symbol": "P4/mmm",
          "theoretical": true,
          "x": 0.125
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.17267713000000148,
          "energy_per_atom": -11.355576186666667,
          "entries_at_x": 5,
          "formula": "Mo2 Ta1",
          "nsites": 3,
          "phase": "oqmd-1975029",
          "phase_kind": "structure",
          "spacegroup_number": 139,
          "spacegroup_symbol": "I4/mmm",
          "theoretical": true,
          "x": 0.3333333333333333
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.194359655000001,
          "energy_per_atom": -11.54466629,
          "entries_at_x": 11,
          "formula": "Mo1 Ta1",
          "nsites": 2,
          "phase": "oqmd-306083",
          "phase_kind": "structure",
          "spacegroup_number": 221,
          "spacegroup_symbol": "Pm-3m",
          "theoretical": true,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.16306279125000067,
          "energy_per_atom": -11.63892511,
          "entries_at_x": 1,
          "formula": "Mo3 Ta5",
          "nsites": 8,
          "phase": "oqmd-1975082",
          "phase_kind": "structure",
          "spacegroup_number": 123,
          "spacegroup_symbol": "P4/mmm",
          "theoretical": true,
          "x": 0.625
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.15914050090909046,
          "energy_per_atom": -11.646416972727273,
          "entries_at_x": 1,
          "formula": "Mo4 Ta7",
          "nsites": 11,
          "phase": "oqmd-2131870",
          "phase_kind": "structure",
          "spacegroup_number": 8,
          "spacegroup_symbol": "Cm",
          "theoretical": true,
          "x": 0.6363636363636364
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.1224331045454544,
          "energy_per_atom": -11.70102280090909,
          "entries_at_x": 1,
          "formula": "Mo3 Ta8",
          "nsites": 11,
          "phase": "oqmd-2131873",
          "phase_kind": "structure",
          "spacegroup_number": 12,
          "spacegroup_symbol": "C2/m",
          "theoretical": true,
          "x": 0.7272727272727273
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.09254935200000033,
          "energy_per_atom": -11.744189627999999,
          "entries_at_x": 1,
          "formula": "Mo1 Ta4",
          "nsites": 5,
          "phase": "oqmd-2131555",
          "phase_kind": "structure",
          "spacegroup_number": 87,
          "spacegroup_symbol": "I4/m",
          "theoretical": true,
          "x": 0.8
        },
        {
          "collinear": false,
          "degenerate": [
            {
              "energy": 0.0,
              "phase": "oqmd-1215197"
            }
          ],
          "energy": 0.0,
          "energy_per_atom": -11.852530369999998,
          "entries_at_x": 32,
          "formula": "Ta",
          "nsites": null,
          "phase": "oqmd-ref-Ta",
          "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": 5.3885000000253314e-05,
    "only_mp_stable": [
      "oqmd-1522225",
      "oqmd-2162668",
      "oqmd-2162725"
    ],
    "only_ours_stable": [
      "oqmd-306083"
    ],
    "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": "MO-TA",
  "x_element": "TA"
}
