{
  "counts": {
    "above_hull": 0,
    "entries": 8,
    "intervals": 7,
    "vertices": 8
  },
  "elements": [
    "PT",
    "SN"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "PT": {
          "energy": -12412.221429477719,
          "phase": "FCC_A1"
        },
        "SN": {
          "energy": -15259.304778419271,
          "phase": "BCT_A5"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -54.192383184768744,
                0.0013469072718095276,
                0.011990686349093949
              ]
            ],
            "knots": [
              0.0,
              0.00042486133939304786
            ],
            "max_abs_error": 0.0017202586842408607
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                0.002725946509182045,
                3.738104802844056e-05,
                -1.8419641784152285e-05
              ]
            ],
            "knots": [
              0.0,
              0.00042486133939304786
            ],
            "max_abs_error": 2.6444269206300297e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -55.00512413615257,
              -0.009798252702239552,
              0.01748250272458307
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            0.00042486133939304786
          ],
          "max_abs_error": 0.0025086946296042356,
          "phase": "FCC_A1",
          "x_hi": 0.00042486133939304786,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 9.123804709988327,
            "slope": -148996.49469535143
          },
          "entropy": {
            "intercept": 0.034219045044897194,
            "slope": -1.2168767488926922
          },
          "intercept": -1.0786035701457806,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 0.00042486133939304786
          },
          "mu_a_rel": -1.0786035701457806,
          "mu_b_rel": -148634.76149623925,
          "right": {
            "phase": "PT3SN_L12",
            "x": 0.25
          },
          "slope": -148633.6828926691,
          "x_hi": 0.25,
          "x_lo": 0.00042486133939304786
        },
        {
          "enthalpy": {
            "intercept": -15978.88961000491,
            "slope": -85044.44103649183
          },
          "entropy": {
            "intercept": 4.4356289891389835,
            "slope": -18.822516525269037
          },
          "intercept": -17301.37239311672,
          "kind": "two_phase",
          "left": {
            "phase": "PT3SN_L12",
            "x": 0.25
          },
          "mu_a_rel": -17301.37239311672,
          "mu_b_rel": -96733.88012759954,
          "right": {
            "phase": "PTSN_B81",
            "x": 0.5
          },
          "slope": -79432.50773448282,
          "x_hi": 0.5,
          "x_lo": 0.25
        },
        {
          "enthalpy": {
            "intercept": -91912.11144689695,
            "slope": 66822.00263729226
          },
          "entropy": {
            "intercept": 3.1962246887752386,
            "slope": -16.343707924541548
          },
          "intercept": -92865.06583785528,
          "kind": "two_phase",
          "left": {
            "phase": "PTSN_B81",
            "x": 0.5
          },
          "mu_a_rel": -92865.06583785528,
          "mu_b_rel": -21170.186682860993,
          "right": {
            "phase": "PT2SN3",
            "x": 0.6000000000000001
          },
          "slope": 71694.87915499428,
          "x_hi": 0.6000000000000001,
          "x_lo": 0.5
        },
        {
          "enthalpy": {
            "intercept": -102204.32987241828,
            "slope": 83975.70001316113
          },
          "entropy": {
            "intercept": -3.820000196627214,
            "slope": -4.649999782204128
          },
          "intercept": -101065.3968137939,
          "kind": "two_phase",
          "left": {
            "phase": "PT2SN3",
            "x": 0.6000000000000001
          },
          "mu_a_rel": -101065.3968137939,
          "mu_b_rel": -15703.299365568586,
          "right": {
            "phase": "PTSN2_C1",
            "x": 0.6666666666666666
          },
          "slope": 85362.09744822531,
          "x_hi": 0.6666666666666666,
          "x_lo": 0.6000000000000001
        },
        {
          "enthalpy": {
            "intercept": -136710.27987241792,
            "slope": 135734.6250131606
          },
          "entropy": {
            "intercept": -29.92000019662727,
            "slope": 34.50000021779596
          },
          "intercept": -127789.63181379352,
          "kind": "two_phase",
          "left": {
            "phase": "PTSN2_C1",
            "x": 0.6666666666666666
          },
          "mu_a_rel": -127789.63181379352,
          "mu_b_rel": -2341.1818655687675,
          "right": {
            "phase": "PTSN4_D1C",
            "x": 0.8
          },
          "slope": 125448.44994822475,
          "x_hi": 0.8,
          "x_lo": 0.6666666666666666
        },
        {
          "enthalpy": {
            "intercept": -140612.8993094472,
            "slope": 140612.8993094472
          },
          "entropy": {
            "intercept": -11.600000111952513,
            "slope": 11.600000111952513
          },
          "intercept": -137154.35927606857,
          "kind": "two_phase",
          "left": {
            "phase": "PTSN4_D1C",
            "x": 0.8
          },
          "mu_a_rel": -137154.35927606857,
          "mu_b_rel": 0.0,
          "right": {
            "phase": "BCT_A5",
            "x": 1.0
          },
          "slope": 137154.35927606857,
          "x_hi": 1.0,
          "x_lo": 0.8
        }
      ],
      "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": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -64.22730916284672,
          "energy_per_atom": -64.22730916284672,
          "enthalpy": -54.17904559114783,
          "entries_at_x": 1,
          "entropy": 0.033702041159486384,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.00042486133939304786
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -37159.49932673742,
          "energy_per_atom": -37159.49932673742,
          "enthalpy": -37239.99986912787,
          "entries_at_x": 1,
          "entropy": -0.27000014217827584,
          "formula": "",
          "nsites": null,
          "phase": "PT3SN_L12",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.25
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -57017.62626035813,
          "energy_per_atom": -57017.62626035813,
          "enthalpy": -58501.110128250824,
          "entries_at_x": 1,
          "entropy": -4.975629273495535,
          "formula": "",
          "nsites": null,
          "phase": "PTSN_B81",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.5
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -49848.13834485869,
          "energy_per_atom": -49848.13834485869,
          "enthalpy": -51818.90986452159,
          "entries_at_x": 1,
          "entropy": -6.610000065949691,
          "formula": "",
          "nsites": null,
          "phase": "PT2SN3",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6000000000000001
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -44157.33184831035,
          "energy_per_atom": -44157.33184831035,
          "enthalpy": -46220.529863644195,
          "entries_at_x": 1,
          "entropy": -6.920000051429966,
          "formula": "",
          "nsites": null,
          "phase": "PTSN2_C1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6666666666666666
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -27430.871855213707,
          "energy_per_atom": -27430.871855213707,
          "enthalpy": -28122.579861889437,
          "entries_at_x": 1,
          "entropy": -2.320000022390502,
          "formula": "",
          "nsites": null,
          "phase": "PTSN4_D1C",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.8
        },
        {
          "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": "PtSn-21Cui",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:58:43Z",
    "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/PtSn-21Cui.tdb",
    "source_sha256": "8a3b41718a07411c2f78e54aae90e22d97a267da64cd66fb989ae8b753643ed5"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "PT-SN",
  "x_element": "SN"
}
