{
  "counts": {
    "above_hull": 0,
    "entries": 6,
    "intervals": 5,
    "vertices": 6
  },
  "elements": [
    "NB",
    "SN"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "NB": {
          "energy": -10813.900458863558,
          "phase": "BCC_A2"
        },
        "SN": {
          "energy": -15259.304682720132,
          "phase": "BCT_A5"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -9.591595431895746,
                0.0022403142007014765,
                0.0043183172384626545
              ]
            ],
            "knots": [
              0.0,
              0.0002087359157429785
            ],
            "max_abs_error": 0.0006197586214344852
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -0.0025431969396228667,
                3.785362043885569e-05,
                -1.720779040859273e-05
              ]
            ],
            "knots": [
              0.0,
              0.0002087359157429785
            ],
            "max_abs_error": 2.469485801899528e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -8.833341264163224,
              -0.009045742985430039,
              0.009448820016102033
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.0002087359157429785
          ],
          "max_abs_error": 0.0013560358462259003,
          "phase": "BCC_A2",
          "x_hi": 0.0002087359157429785,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 4.249352908367529,
            "slope": -66276.99722676726
          },
          "entropy": {
            "intercept": 0.01602115105653073,
            "slope": -10.064085125208333
          },
          "intercept": -0.5273532791381168,
          "kind": "two_phase",
          "left": {
            "phase": "BCC_A2",
            "x": 0.0002087359157429785
          },
          "mu_a_rel": -0.5273532791381168,
          "mu_b_rel": -63276.91759996551,
          "right": {
            "phase": "NB3SN_A15",
            "x": 0.250000000000005
          },
          "slope": -63276.39024668637,
          "x_hi": 0.250000000000005,
          "x_lo": 0.0002087359157429785
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -16564.99995378378,
                0.27207859254637595,
                2.0861007916650465e-05,
                -1.0379481656386247e-05
              ]
            ],
            "knots": [
              0.250000000000005,
              0.2500094628741787
            ],
            "max_abs_error": 1.4932047633919865e-06
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -7.175514669052526,
                0.0011829060941300712,
                -0.0006979057461871407,
                0.00030961163230272754
              ]
            ],
            "knots": [
              0.250000000000005,
              0.2500094628741787
            ],
            "max_abs_error": 3.4857592593695585e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -14425.620255205764,
              -0.08060485888512044,
              0.2081014584805776,
              -0.09232108744303291
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.250000000000005,
            0.2500094628741787
          ],
          "max_abs_error": 0.010394272507255664,
          "phase": "NB3SN_A15",
          "x_hi": 0.2500094628741787,
          "x_lo": 0.250000000000005
        },
        {
          "enthalpy": {
            "intercept": -17206.20345918114,
            "slope": 2565.805258316409
          },
          "entropy": {
            "intercept": -1.738544445895254,
            "slope": -3.042183396620763
          },
          "intercept": -16687.856432637473,
          "kind": "two_phase",
          "left": {
            "phase": "NB3SN_A15",
            "x": 0.2500094628741787
          },
          "mu_a_rel": -16687.856432637473,
          "mu_b_rel": -13215.02419461858,
          "right": {
            "phase": "NBSN2_CB",
            "x": 0.6666666666666666
          },
          "slope": 3472.832238018893,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.2500094628741787
        },
        {
          "enthalpy": {
            "intercept": -46486.9998609106,
            "slope": 46486.9998609106
          },
          "entropy": {
            "intercept": -11.300000130927286,
            "slope": 11.300000130927286
          },
          "intercept": -43117.904821874625,
          "kind": "two_phase",
          "left": {
            "phase": "NBSN2_CB",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -43117.904821874625,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "BCT_A5",
            "x": 1.0
          },
          "slope": 43117.904821874625,
          "x_hi": 1.0,
          "x_lo": 0.6666666666666666
        }
      ],
      "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": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -13.735408542190271,
          "energy_per_atom": -13.735408542190271,
          "enthalpy": -9.585036800456582,
          "entries_at_x": 1,
          "entropy": 0.013920415031805078,
          "formula": "",
          "nsites": null,
          "phase": "BCC_A2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0002087359157429785
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15819.624914951048,
          "energy_per_atom": -15819.624914951048,
          "enthalpy": -16564.99995378378,
          "entries_at_x": 1,
          "entropy": -2.5000001302456027,
          "formula": "",
          "nsites": null,
          "phase": "NB3SN_A15",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.250000000000005
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15819.615510158237,
          "energy_per_atom": -15819.615510158237,
          "enthalpy": -16564.727864709712,
          "entries_at_x": 1,
          "entropy": -2.4991190828491554,
          "formula": "",
          "nsites": null,
          "phase": "NB3SN_A15",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.2500094628741787
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -14372.634940624877,
          "energy_per_atom": -14372.634940624877,
          "enthalpy": -15495.666620303535,
          "entries_at_x": 1,
          "entropy": -3.766666710309096,
          "formula": "",
          "nsites": null,
          "phase": "NBSN2_CB",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "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": "NbSn-02Tof",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:51:23Z",
    "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/NbSn-02Tof.tdb",
    "source_sha256": "28d911b942daf4344c792e37b434cbcc8a7f9344e35efdfa3c5fd1394e84c9d3"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "NB-SN",
  "x_element": "SN"
}
