{
  "counts": {
    "above_hull": 0,
    "entries": 4,
    "intervals": 3,
    "vertices": 4
  },
  "elements": [
    "BI",
    "SN"
  ],
  "flags": [
    "no_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "BI": {
          "energy": -16915.53990574719,
          "phase": "RHOMBOHEDRAL_A7"
        },
        "SN": {
          "energy": -15259.304688410964,
          "phase": "BCT_A5"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                73.68100823832154,
                -0.04876144860422471,
                -0.002627740113680943
              ]
            ],
            "knots": [
              0.0,
              0.004606598489857982
            ],
            "max_abs_error": 0.00021402429730343897
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                0.04036573420323074,
                0.00043433509729731007,
                -1.9311747467977425e-05
              ]
            ],
            "knots": [
              0.0,
              0.004606598489857982
            ],
            "max_abs_error": 2.3987287273690566e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              61.64596458658921,
              -0.17825845953322528,
              0.003130058107295497
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.004606598489857982
          ],
          "max_abs_error": 0.0005011568298733948,
          "phase": "RHOMBOHEDRAL_A7",
          "x_hi": 0.004606598489857982,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 73.28022647862049,
            "slope": 75.84610895704665
          },
          "entropy": {
            "intercept": 0.2835960842486623,
            "slope": 0.31896920573298737
          },
          "intercept": -11.273946040113628,
          "kind": "two_phase",
          "left": {
            "phase": "RHOMBOHEDRAL_A7",
            "x": 0.004606598489857982
          },
          "mu_a_rel": -11.273946040113628,
          "mu_b_rel": -30.528505772360177,
          "right": {
            "phase": "BCT_A5",
            "x": 0.9867769441688412
          },
          "slope": -19.25455973224655,
          "x_hi": 0.9867769441688412,
          "x_lo": 0.004606598489857982
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                148.12341810235196,
                -145.5995758826168,
                -2.5077810479351967,
                -0.016061171800004104
              ]
            ],
            "knots": [
              0.9867769441688412,
              1.0
            ],
            "max_abs_error": 0.0001584639481677641
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.013546073497562205,
                -0.013363905036498534,
                -0.00019781963774218037,
                1.5651176678508835e-05
              ]
            ],
            "knots": [
              0.9867769441688412,
              1.0
            ],
            "max_abs_error": 2.2848947991930407e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              144.08465628905532,
              -141.6151275960936,
              -2.4488011226546007,
              -0.02072757030711614
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.9867769441688412,
            1.0
          ],
          "max_abs_error": 0.0005285101855037055,
          "phase": "BCT_A5",
          "x_hi": 1.0,
          "x_lo": 0.9867769441688412
        }
      ],
      "temperature_K": 298.15,
      "vertices": [
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": 0.0,
          "enthalpy": 0.0,
          "entries_at_x": 1,
          "entropy": 0.0,
          "formula": "",
          "nsites": null,
          "phase": "RHOMBOHEDRAL_A7",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -11.362644065899076,
          "energy_per_atom": -11.362644065899076,
          "enthalpy": 73.62961904960363,
          "entries_at_x": 1,
          "entropy": 0.2850654473101031,
          "formula": "",
          "nsites": null,
          "phase": "RHOMBOHEDRAL_A7",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.004606598489857982
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -30.2739016540163,
          "energy_per_atom": -30.2739016540163,
          "enthalpy": 148.12341810235196,
          "entries_at_x": 1,
          "entropy": 0.598347542365822,
          "formula": "",
          "nsites": null,
          "phase": "BCT_A5",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.9867769441688412
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": 0.0,
          "energy_per_atom": 0.0,
          "enthalpy": 0.0,
          "entries_at_x": 1,
          "entropy": 0.0,
          "formula": "",
          "nsites": null,
          "phase": "BCT_A5",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 1.0
        }
      ]
    }
  ],
  "mp_agreement": {
    "comparable": false,
    "comparable_note": "CALPHAD isotherms have no upstream stability flag to compare against",
    "max_abs_delta_energy_above_hull": 0.0,
    "only_mp_stable": [],
    "only_ours_stable": [],
    "stable_sets_match": true
  },
  "provenance": {
    "assessment": "BiSn-07Viz",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:19:38Z",
    "phase_families": {},
    "sample_conditions": {
      "endpoint_tol": 1.0,
      "fit_samples": 65,
      "order_tol": 0.0001,
      "pressure_Pa": 101325.0,
      "redundant_tol": 1.0,
      "refine_tol": 1e-07,
      "step": 0.002,
      "temperature_K": 298.15
    },
    "source_path": "databases/sgte-binary/BiSn-07Viz.tdb",
    "source_sha256": "9e4059d48e86c0058f4611de849479d34698b25e8e52b841973bab5528f55250"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "BI-SN",
  "x_element": "SN"
}