{
  "counts": {
    "above_hull": 0,
    "entries": 4,
    "intervals": 3,
    "vertices": 4
  },
  "elements": [
    "PB",
    "ZN"
  ],
  "flags": [
    "no_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "PB": {
          "energy": -19320.12040136579,
          "phase": "FCC_A1"
        },
        "ZN": {
          "energy": -12411.98422192186,
          "phase": "HCP_A3"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                0.08238254231732298,
                0.006367605114560568,
                -0.0031666261989319183
              ]
            ],
            "knots": [
              0.0,
              2.4773433863946e-06
            ],
            "max_abs_error": 0.0004538593804814771
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                5.736391750870992e-06,
                3.059173209542506e-05,
                -1.5212933699138872e-05
              ]
            ],
            "knots": [
              0.0,
              2.4773433863946e-06
            ],
            "max_abs_error": 2.180424486875187e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              0.0806722364249263,
              -0.002753317705050426,
              0.0013691085696393018
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            2.4773433863946e-06
          ],
          "max_abs_error": 0.00019623413375172843,
          "phase": "FCC_A1",
          "x_hi": 2.4773433863946e-06,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 0.08558340603765555,
            "slope": 0.046499527152377367
          },
          "entropy": {
            "intercept": 0.00030759531894210013,
            "slope": 0.00017156277130157282
          },
          "intercept": -0.006126138305993116,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1",
            "x": 2.4773433863946e-06
          },
          "mu_a_rel": -0.006126138305993116,
          "mu_b_rel": -0.010778051415050314,
          "right": {
            "phase": "HCP_A3",
            "x": 0.999995639815155
          },
          "slope": -0.004651913109057198,
          "x_hi": 0.999995639815155,
          "x_lo": 2.4773433863946e-06
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.13208273044349933,
                -0.13211246240133234,
                -0.0027920709186755044,
                0.002821802876508517
              ]
            ],
            "knots": [
              0.999995639815155,
              1.0
            ],
            "max_abs_error": 0.00040470632142142193
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -4.5607980244311746e-06,
                4.358163036685976e-06,
                -1.868216959793404e-05,
                1.888480458567924e-05
              ]
            ],
            "knots": [
              0.999995639815155,
              1.0
            ],
            "max_abs_error": 2.708500117670999e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.13344253237555131,
              -0.1334118488636556,
              0.002778018557988371,
              -0.0028087020698840948
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.999995639815155,
            1.0
          ],
          "max_abs_error": 0.0004028330234439534,
          "phase": "HCP_A3",
          "x_hi": 1.0,
          "x_lo": 0.999995639815155
        }
      ],
      "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": -0.0061261498303792905,
          "energy_per_atom": -0.0061261498303792905,
          "enthalpy": 0.08558352123295161,
          "entries_at_x": 1,
          "entropy": 0.00030759574396199696,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 2.4773433863946e-06
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.010778031131849275,
          "energy_per_atom": -0.010778031131849275,
          "enthalpy": 0.13208273044349933,
          "entries_at_x": 1,
          "entropy": 0.00047915734219827755,
          "formula": "",
          "nsites": null,
          "phase": "HCP_A3",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.999995639815155
        },
        {
          "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": "HCP_A3",
          "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": "PbZn-93Sri-LB",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:56:38Z",
    "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/PbZn-93Sri-LB.tdb",
    "source_sha256": "7baa1c24737eb72601e1ebfc98ce940f1f941a56d0e7e3a3b6c4a9450db36d79"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "PB-ZN",
  "x_element": "ZN"
}
