{
  "counts": {
    "above_hull": 0,
    "entries": 13,
    "intervals": 12,
    "vertices": 13
  },
  "elements": [
    "AL",
    "CU"
  ],
  "flags": [
    "has_intermediate_phases",
    "solution_phases"
  ],
  "isotherms": [
    {
      "element_reference": {
        "AL": {
          "energy": -8437.646035209189,
          "phase": "FCC_A1"
        },
        "CU": {
          "energy": -9883.671653017936,
          "phase": "FCC_A1"
        }
      },
      "intervals": [
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                0.0,
                -0.025048012904591768,
                -0.002424854547523562,
                0.0012056391764516255
              ]
            ],
            "knots": [
              0.0,
              1.975216993596372e-06
            ],
            "max_abs_error": 0.00017270905891167768
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                0.0,
                -1.6483023804259936e-05,
                3.3864448393547776e-05,
                -1.683935705814644e-05
              ]
            ],
            "knots": [
              0.0,
              1.975216993596372e-06
            ],
            "max_abs_error": 2.4122629945378324e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              0.0,
              -0.020133599216278348,
              -0.012521540140845278,
              0.006226293646281043
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.0,
            1.975216993596372e-06
          ],
          "max_abs_error": 0.0008919252910505639,
          "phase": "FCC_A1#1",
          "x_hi": 1.975216993596372e-06,
          "x_lo": 0.0
        },
        {
          "enthalpy": {
            "intercept": 0.06925590196126619,
            "slope": -48360.82847940992
          },
          "entropy": {
            "intercept": 0.0002484770398700472,
            "slope": -7.999377108433121
          },
          "intercept": -0.004827527476757493,
          "kind": "two_phase",
          "left": {
            "phase": "FCC_A1#1",
            "x": 1.975216993596372e-06
          },
          "mu_a_rel": -0.004827527476757493,
          "mu_b_rel": -45975.81902205805,
          "right": {
            "phase": "AL2CU_C16",
            "x": 0.3333294396316497
          },
          "slope": -45975.814194530576,
          "x_hi": 0.3333294396316497,
          "x_lo": 1.975216993596372e-06
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -16120.018601262074,
                -0.31449143699527954,
                -1.0254344212645705e-07,
                1.2657501158308548e-09
              ]
            ],
            "knots": [
              0.3333294396316497,
              0.3333333308435766
            ],
            "max_abs_error": 1.0732037480920553e-10
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -7.95843022987235,
                -0.00047719391948403123,
                8.482009935684642e-05,
                -0.00011702392451363108
              ]
            ],
            "knots": [
              0.3333294396316497,
              0.3333333308435766
            ],
            "max_abs_error": 1.2877804890898403e-05
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -13747.21262822563,
              -0.17221607019316432,
              -0.025289213934777136,
              0.03489068342114689
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.3333294396316497,
            0.3333333308435766
          ],
          "max_abs_error": 0.0038395174397010123,
          "phase": "AL2CU_C16",
          "x_hi": 0.3333333308435766,
          "x_lo": 0.3333294396316497
        },
        {
          "enthalpy": {
            "intercept": -7429.856749822742,
            "slope": -26071.429223667354
          },
          "entropy": {
            "intercept": -4.535713140264469,
            "slope": 5.607140311413542
          },
          "intercept": -6077.533877052894,
          "kind": "two_phase",
          "left": {
            "phase": "AL2CU_C16",
            "x": 0.3333333308435766
          },
          "mu_a_rel": -6077.533877052894,
          "mu_b_rel": -33820.73198456819,
          "right": {
            "phase": "ALCU_ETA_2",
            "x": 0.52
          },
          "slope": -27743.1981075153,
          "x_hi": 0.52,
          "x_lo": 0.3333333308435766
        },
        {
          "enthalpy": {
            "intercept": -16674.30764037643,
            "slope": -8293.639049525644
          },
          "entropy": {
            "intercept": -12.379249734354728,
            "slope": 20.690864530817887
          },
          "intercept": -12983.434332078803,
          "kind": "two_phase",
          "left": {
            "phase": "ALCU_ETA_2",
            "x": 0.52
          },
          "mu_a_rel": -12983.434332078803,
          "mu_b_rel": -27446.05464146736,
          "right": {
            "phase": "AL9CU11",
            "x": 0.5500103191933067
          },
          "slope": -14462.620309388556,
          "x_hi": 0.5500103191933067,
          "x_lo": 0.52
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -21235.894701280104,
                3.4757191973130492,
                0.035533734158737396,
                -1.7917618454710293e-05
              ]
            ],
            "knots": [
              0.5500103191933067,
              0.5503510133858737
            ],
            "max_abs_error": 9.204086381942034e-10
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -6.720547953053333,
                0.02861437078398764,
                -0.01210453614335727,
                0.0047918376014904895
              ]
            ],
            "knots": [
              0.5500103191933067,
              0.5503510133858737
            ],
            "max_abs_error": 0.000414454450302415
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -19232.163329077244,
              -5.055655452086732,
              3.6445011855229352,
              -1.4287042985723786
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.5500103191933067,
            0.5503510133858737
          ],
          "max_abs_error": 0.12356959398312028,
          "phase": "AL9CU11",
          "x_hi": 0.5503510133858737,
          "x_lo": 0.5500103191933067
        },
        {
          "enthalpy": {
            "intercept": -19651.176741867792,
            "slope": -2873.0876948341456
          },
          "entropy": {
            "intercept": -5.8724789520798835,
            "slope": 8.892778009582058
          },
          "intercept": -17900.297142305146,
          "kind": "two_phase",
          "left": {
            "phase": "AL9CU11",
            "x": 0.5503510133858737
          },
          "mu_a_rel": -17900.297142305146,
          "mu_b_rel": -23424.766600696228,
          "right": {
            "phase": "AL5CU8",
            "x": 0.6153846153846153
          },
          "slope": -5524.469458391082,
          "x_hi": 0.6153846153846153,
          "x_lo": 0.5503510133858737
        },
        {
          "enthalpy": {
            "intercept": -55090.88022913468,
            "slope": 54716.43047197455
          },
          "entropy": {
            "intercept": -31.3738692441071,
            "slope": 50.33253723412629
          },
          "intercept": -45736.761114004155,
          "kind": "two_phase",
          "left": {
            "phase": "AL5CU8",
            "x": 0.6153846153846153
          },
          "mu_a_rel": -45736.761114004155,
          "mu_b_rel": -6026.976618384346,
          "right": {
            "phase": "GAMMA_D83",
            "x": 0.66966807146293
          },
          "slope": 39709.78449561981,
          "x_hi": 0.66966807146293,
          "x_lo": 0.6153846153846153
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -18449.033757631987,
                398.9008667967547,
                14.131755292307275,
                -0.3118516264738673
              ]
            ],
            "knots": [
              0.66966807146293,
              0.6780858948447983
            ],
            "max_abs_error": 2.2034240828361362e-05
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -2.942583045685356,
                0.266233194603802,
                -0.005847527493701821,
                2.775772763069506e-05
              ]
            ],
            "knots": [
              0.66966807146293,
              0.6780858948447983
            ],
            "max_abs_error": 6.769009353035926e-09
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -17571.702622560897,
              319.5234398253686,
              15.875195615001246,
              -0.32012759315733774
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.66966807146293,
            0.6780858948447983
          ],
          "max_abs_error": 2.1670988644473255e-05,
          "phase": "GAMMA_D83",
          "x_hi": 0.6780858948447983,
          "x_lo": 0.66966807146293
        },
        {
          "enthalpy": {
            "intercept": -48515.34465919416,
            "slope": 44948.62952281417
          },
          "entropy": {
            "intercept": -0.8381887111458153,
            "slope": 4.984660436916061
          },
          "intercept": -48265.43869496601,
          "kind": "two_phase",
          "left": {
            "phase": "GAMMA_D83",
            "x": 0.6780858948447983
          },
          "mu_a_rel": -48265.43869496601,
          "mu_b_rel": -4802.985681418402,
          "right": {
            "phase": "ALCU3_D022",
            "x": 0.77
          },
          "slope": 43462.45301354761,
          "x_hi": 0.77,
          "x_lo": 0.6780858948447983
        },
        {
          "enthalpy": {
            "intercept": -49703.24789890152,
            "slope": 46491.3610029536
          },
          "entropy": {
            "intercept": -0.45367045603519074,
            "slope": 4.485286079629536
          },
          "intercept": -49567.98605243463,
          "kind": "two_phase",
          "left": {
            "phase": "ALCU3_D022",
            "x": 0.77
          },
          "mu_a_rel": -49567.98605243463,
          "mu_b_rel": -4413.913094122581,
          "right": {
            "phase": "FCC_A1#2",
            "x": 0.8311632557067522
          },
          "slope": 45154.07295831205,
          "x_hi": 0.8311632557067522,
          "x_lo": 0.77
        },
        {
          "enthalpy": {
            "entropy_form": null,
            "hermite": [
              [
                -11061.336925448677,
                7041.900186681484,
                3683.051103036345,
                336.3856357308505
              ]
            ],
            "knots": [
              0.8311632557067522,
              1.0
            ],
            "max_abs_error": 0.24596387135261466
          },
          "entropy": {
            "entropy_form": {
              "R": 8.31446261815324,
              "kind": "ideal_mixing_entropy"
            },
            "hermite": [
              [
                -0.5007384679549114,
                0.2868048563113269,
                0.1911701704496479,
                0.022763441193936584
              ]
            ],
            "knots": [
              0.8311632557067522,
              1.0
            ],
            "max_abs_error": 1.4891850721732158e-06
          },
          "entropy_form": {
            "RT": 2478.957029602388,
            "kind": "ideal_mixing"
          },
          "hermite": [
            [
              -10912.04175122792,
              6956.389318772304,
              3626.0537167167276,
              329.59871573888813
            ]
          ],
          "kind": "single_phase",
          "knots": [
            0.8311632557067522,
            1.0
          ],
          "max_abs_error": 0.2457501646340461,
          "phase": "FCC_A1#2",
          "x_hi": 1.0,
          "x_lo": 0.8311632557067522
        }
      ],
      "phase_instances": {
        "FCC_A1#1": "FCC_A1",
        "FCC_A1#2": "FCC_A1"
      },
      "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#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.0
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -0.09563973696822359,
          "energy_per_atom": -0.09563973696822359,
          "enthalpy": -0.026267228275663697,
          "entries_at_x": 1,
          "entropy": 0.0002326765342672843,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1#1",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 1.975216993596372e-06
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15325.0972095992,
          "energy_per_atom": -15325.0972095992,
          "enthalpy": -16120.018601262074,
          "entries_at_x": 1,
          "entropy": -2.6661794119163886,
          "formula": "",
          "nsites": null,
          "phase": "AL2CU_C16",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333294396316497
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -15325.26651048418,
          "energy_per_atom": -15325.26651048418,
          "enthalpy": -16120.333092800343,
          "entries_at_x": 1,
          "entropy": -2.6666663837537037,
          "formula": "",
          "nsites": null,
          "phase": "AL2CU_C16",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.3333333308435766
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -20503.99689296085,
          "energy_per_atom": -20503.99689296085,
          "enthalpy": -20986.999946129767,
          "entries_at_x": 1,
          "entropy": -1.6200001783294269,
          "formula": "",
          "nsites": null,
          "phase": "ALCU_ETA_2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.52
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -20938.0247448172,
          "energy_per_atom": -20938.0247448172,
          "enthalpy": -21235.894701280104,
          "entries_at_x": 1,
          "entropy": -0.9990607293741149,
          "formula": "",
          "nsites": null,
          "phase": "AL9CU11",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.5500103191933067
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -20940.694507149987,
          "energy_per_atom": -20940.694507149987,
          "enthalpy": -21232.38346626625,
          "entries_at_x": 1,
          "entropy": -0.9783295626907851,
          "formula": "",
          "nsites": null,
          "phase": "AL9CU11",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.5503510133858737
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -21299.970655161196,
          "energy_per_atom": -21299.970655161196,
          "enthalpy": -21419.230707919574,
          "entries_at_x": 1,
          "entropy": -0.4000001769524637,
          "formula": "",
          "nsites": null,
          "phase": "AL5CU8",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6153846153846153
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -19144.38631261388,
          "energy_per_atom": -19144.38631261388,
          "enthalpy": -18449.033757631987,
          "entries_at_x": 1,
          "entropy": 2.332223897306367,
          "formula": "",
          "nsites": null,
          "phase": "GAMMA_D83",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.66966807146293
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -18794.16235112458,
          "energy_per_atom": -18794.16235112458,
          "enthalpy": -18036.3129871694,
          "entries_at_x": 1,
          "entropy": 2.5418392217178756,
          "formula": "",
          "nsites": null,
          "phase": "GAMMA_D83",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.6780858948447983
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -14799.349874534353,
          "energy_per_atom": -14799.349874534353,
          "enthalpy": -13904.899926627255,
          "entries_at_x": 1,
          "entropy": 2.999999825279552,
          "formula": "",
          "nsites": null,
          "phase": "ALCU3_D022",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.77
        },
        {
          "collinear": false,
          "degenerate": [],
          "energy": -12037.57976398377,
          "energy_per_atom": -12037.57976398377,
          "enthalpy": -11061.336925448677,
          "entries_at_x": 1,
          "entropy": 3.2743345246858695,
          "formula": "",
          "nsites": null,
          "phase": "FCC_A1#2",
          "phase_kind": "solution",
          "spacegroup_number": null,
          "spacegroup_symbol": "",
          "theoretical": false,
          "x": 0.8311632557067522
        },
        {
          "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#2",
          "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": "AlCu-15Lia",
    "builder_version": 1,
    "engine": {
      "numpy": "2.5.1",
      "pycalphad": "0.11.2",
      "python": "3.13.15"
    },
    "fit_tol": 1.0,
    "observed_at": "2026-09-03T00:09:53Z",
    "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/AlCu-15Lia.tdb",
    "source_sha256": "cc9baa9f2479820ca73d3b8655ba619569f8f6e78c02539c51e79dd98d73dd74"
  },
  "reference": {
    "kind": "calphad_formation_T",
    "per": "mole_atoms",
    "temperature_K": 298.15,
    "units": "J/mol-atoms"
  },
  "schema_version": 1,
  "system_id": "AL-CU",
  "x_element": "CU"
}
