{
  "metadata": {
    "test": "HPC-031",
    "date": "2026-03-28T17:10:07.011168+00:00",
    "element_count": 59,
    "predictions_source": "HPC-030 (EM FDTD, pre-registered)",
    "property_sources": "CRC Handbook, Kittel, Ashby, Callister"
  },
  "archetype_stats": {
    "BCC": {
      "rho_mean": 26.884666666666664,
      "rho_median": 12.8,
      "HV_mean": 662.5333333333333,
      "E_coh_mean": 3.8053333333333326,
      "alpha_mean": 34.153333333333336,
      "ductile_pct": 86.66666666666667,
      "count": 15
    },
    "FCC": {
      "rho_mean": 13.262466666666667,
      "rho_median": 6.93,
      "HV_mean": 450.73333333333335,
      "E_coh_mean": 3.8806666666666674,
      "alpha_mean": 15.90666666666667,
      "ductile_pct": 100.0,
      "count": 15
    },
    "HCP": {
      "rho_mean": 44.23739130434783,
      "rho_median": 39.0,
      "HV_mean": 1032.0869565217392,
      "E_coh_mean": 4.269130434782609,
      "alpha_mean": 12.786956521739128,
      "ductile_pct": 95.65217391304348,
      "count": 23
    },
    "Diamond": {
      "rho_mean": 75000.0,
      "rho_median": 75000.0,
      "HV_mean": 39166.666666666664,
      "E_coh_mean": 5.283333333333333,
      "alpha_mean": 3.1333333333333333,
      "ductile_pct": 0.0,
      "count": 3
    },
    "A7": {
      "rho_mean": 57.333333333333336,
      "rho_median": 39.0,
      "HV_mean": 629.3333333333334,
      "E_coh_mean": 2.6300000000000003,
      "alpha_mean": 13.299999999999999,
      "ductile_pct": 0.0,
      "count": 3
    }
  },
  "hcp_ca_correlations": {
    "c/a_vs_rho_correlation": -0.187,
    "c/a_vs_alpha_correlation": 0.604,
    "c/a_vs_HV_correlation": -0.227,
    "c/a_vs_E_coh_correlation": -0.474
  },
  "anomalies": [
    [
      "Na",
      "BCC",
      [
        "BCC but very soft (HV=7 MPa)",
        "BCC but low cohesive energy (1.11 eV)"
      ]
    ],
    [
      "K",
      "BCC",
      [
        "BCC but very soft (HV=4 MPa)",
        "BCC but low cohesive energy (0.93 eV)"
      ]
    ],
    [
      "Rb",
      "BCC",
      [
        "BCC but very soft (HV=3 MPa)",
        "BCC but low cohesive energy (0.85 eV)"
      ]
    ],
    [
      "Cs",
      "BCC",
      [
        "BCC but very soft (HV=2 MPa)",
        "BCC but low cohesive energy (0.8 eV)"
      ]
    ],
    [
      "Mn",
      "BCC",
      [
        "BCC but very high resistivity (144.0 \u03bc\u03a9\u00b7cm)"
      ]
    ],
    [
      "Ir",
      "FCC",
      [
        "FCC but very hard (HV=1760 MPa)",
        "FCC but high cohesive energy (6.94 eV)"
      ]
    ],
    [
      "Th",
      "FCC",
      [
        "FCC but high cohesive energy (6.2 eV)"
      ]
    ],
    [
      "Ce",
      "FCC",
      [
        "FCC but high resistivity (74.0 \u03bc\u03a9\u00b7cm)"
      ]
    ],
    [
      "Zn",
      "HCP",
      [
        "HCP with extreme c/a deviation (1.856) but ductile"
      ]
    ],
    [
      "Cd",
      "HCP",
      [
        "HCP with extreme c/a deviation (1.886) but ductile"
      ]
    ]
  ],
  "elements": {
    "Li": {
      "struct": "BCC",
      "a": 3.51,
      "rho": 9.47,
      "HV": 50,
      "E_coh": 1.63,
      "ductile": true,
      "alpha": 46.0,
      "group": 1,
      "period": 2
    },
    "Na": {
      "struct": "BCC",
      "a": 4.225,
      "rho": 4.77,
      "HV": 7,
      "E_coh": 1.11,
      "ductile": true,
      "alpha": 71.0,
      "group": 1,
      "period": 3
    },
    "K": {
      "struct": "BCC",
      "a": 5.225,
      "rho": 7.2,
      "HV": 4,
      "E_coh": 0.93,
      "ductile": true,
      "alpha": 83.0,
      "group": 1,
      "period": 4
    },
    "V": {
      "struct": "BCC",
      "a": 3.024,
      "rho": 19.7,
      "HV": 628,
      "E_coh": 5.31,
      "ductile": true,
      "alpha": 8.4,
      "group": 5,
      "period": 4
    },
    "Cr": {
      "struct": "BCC",
      "a": 2.884,
      "rho": 12.7,
      "HV": 1060,
      "E_coh": 4.1,
      "ductile": false,
      "alpha": 4.9,
      "group": 6,
      "period": 4,
      "notes": "brittle at RT"
    },
    "Fe": {
      "struct": "BCC",
      "a": 2.866,
      "rho": 9.71,
      "HV": 608,
      "E_coh": 4.28,
      "ductile": true,
      "alpha": 11.8,
      "group": 8,
      "period": 4
    },
    "Rb": {
      "struct": "BCC",
      "a": 5.585,
      "rho": 12.8,
      "HV": 3,
      "E_coh": 0.85,
      "ductile": true,
      "alpha": 90.0,
      "group": 1,
      "period": 5
    },
    "Nb": {
      "struct": "BCC",
      "a": 3.301,
      "rho": 15.2,
      "HV": 1320,
      "E_coh": 7.57,
      "ductile": true,
      "alpha": 7.3,
      "group": 5,
      "period": 5
    },
    "Mo": {
      "struct": "BCC",
      "a": 3.147,
      "rho": 5.34,
      "HV": 1530,
      "E_coh": 6.82,
      "ductile": true,
      "alpha": 4.8,
      "group": 6,
      "period": 5
    },
    "Cs": {
      "struct": "BCC",
      "a": 6.045,
      "rho": 20.0,
      "HV": 2,
      "E_coh": 0.8,
      "ductile": true,
      "alpha": 97.0,
      "group": 1,
      "period": 6
    },
    "Ba": {
      "struct": "BCC",
      "a": 5.02,
      "rho": 34.0,
      "HV": 60,
      "E_coh": 1.9,
      "ductile": true,
      "alpha": 20.6,
      "group": 2,
      "period": 6
    },
    "Ta": {
      "struct": "BCC",
      "a": 3.303,
      "rho": 13.1,
      "HV": 873,
      "E_coh": 8.1,
      "ductile": true,
      "alpha": 6.3,
      "group": 5,
      "period": 6
    },
    "W": {
      "struct": "BCC",
      "a": 3.165,
      "rho": 5.28,
      "HV": 3430,
      "E_coh": 8.9,
      "ductile": true,
      "alpha": 4.5,
      "group": 6,
      "period": 6
    },
    "Eu": {
      "struct": "BCC",
      "a": 4.581,
      "rho": 90.0,
      "HV": 167,
      "E_coh": 1.86,
      "ductile": true,
      "alpha": 35.0,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Mn": {
      "struct": "BCC",
      "a": 8.912,
      "rho": 144.0,
      "HV": 196,
      "E_coh": 2.92,
      "ductile": false,
      "alpha": 21.7,
      "group": 7,
      "period": 4,
      "notes": "complex cubic, approximated BCC"
    },
    "Al": {
      "struct": "FCC",
      "a": 4.05,
      "rho": 2.65,
      "HV": 167,
      "E_coh": 3.39,
      "ductile": true,
      "alpha": 23.1,
      "group": 13,
      "period": 3
    },
    "Ca": {
      "struct": "FCC",
      "a": 5.588,
      "rho": 3.36,
      "HV": 170,
      "E_coh": 1.84,
      "ductile": true,
      "alpha": 22.3,
      "group": 2,
      "period": 4
    },
    "Ni": {
      "struct": "FCC",
      "a": 3.524,
      "rho": 6.93,
      "HV": 638,
      "E_coh": 4.44,
      "ductile": true,
      "alpha": 13.4,
      "group": 10,
      "period": 4
    },
    "Cu": {
      "struct": "FCC",
      "a": 3.615,
      "rho": 1.67,
      "HV": 369,
      "E_coh": 3.49,
      "ductile": true,
      "alpha": 16.5,
      "group": 11,
      "period": 4
    },
    "Sr": {
      "struct": "FCC",
      "a": 6.084,
      "rho": 13.2,
      "HV": 70,
      "E_coh": 1.72,
      "ductile": true,
      "alpha": 22.5,
      "group": 2,
      "period": 5
    },
    "Rh": {
      "struct": "FCC",
      "a": 3.803,
      "rho": 4.33,
      "HV": 1246,
      "E_coh": 5.75,
      "ductile": true,
      "alpha": 8.2,
      "group": 9,
      "period": 5
    },
    "Pd": {
      "struct": "FCC",
      "a": 3.89,
      "rho": 10.5,
      "HV": 461,
      "E_coh": 3.89,
      "ductile": true,
      "alpha": 11.8,
      "group": 10,
      "period": 5
    },
    "Ag": {
      "struct": "FCC",
      "a": 4.086,
      "rho": 1.587,
      "HV": 251,
      "E_coh": 2.95,
      "ductile": true,
      "alpha": 18.9,
      "group": 11,
      "period": 5
    },
    "Ir": {
      "struct": "FCC",
      "a": 3.839,
      "rho": 4.7,
      "HV": 1760,
      "E_coh": 6.94,
      "ductile": true,
      "alpha": 6.4,
      "group": 9,
      "period": 6
    },
    "Pt": {
      "struct": "FCC",
      "a": 3.923,
      "rho": 10.5,
      "HV": 549,
      "E_coh": 5.84,
      "ductile": true,
      "alpha": 8.8,
      "group": 10,
      "period": 6
    },
    "Au": {
      "struct": "FCC",
      "a": 4.078,
      "rho": 2.21,
      "HV": 216,
      "E_coh": 3.81,
      "ductile": true,
      "alpha": 14.2,
      "group": 11,
      "period": 6
    },
    "Pb": {
      "struct": "FCC",
      "a": 4.95,
      "rho": 20.6,
      "HV": 38,
      "E_coh": 2.03,
      "ductile": true,
      "alpha": 28.9,
      "group": 14,
      "period": 6
    },
    "Th": {
      "struct": "FCC",
      "a": 5.084,
      "rho": 14.7,
      "HV": 350,
      "E_coh": 6.2,
      "ductile": true,
      "alpha": 11.0,
      "group": null,
      "period": 7,
      "notes": "actinide"
    },
    "Yb": {
      "struct": "FCC",
      "a": 5.485,
      "rho": 28.0,
      "HV": 206,
      "E_coh": 1.6,
      "ductile": true,
      "alpha": 26.3,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Ce": {
      "struct": "FCC",
      "a": 5.16,
      "rho": 74.0,
      "HV": 270,
      "E_coh": 4.32,
      "ductile": true,
      "alpha": 6.3,
      "group": null,
      "period": 6,
      "notes": "lanthanide, gamma-Ce"
    },
    "Be": {
      "struct": "HCP",
      "a": 2.286,
      "c_a": 1.568,
      "rho": 3.56,
      "HV": 1670,
      "E_coh": 3.32,
      "ductile": false,
      "alpha": 11.3,
      "group": 2,
      "period": 2
    },
    "Mg": {
      "struct": "HCP",
      "a": 3.209,
      "c_a": 1.624,
      "rho": 4.39,
      "HV": 260,
      "E_coh": 1.51,
      "ductile": true,
      "alpha": 24.8,
      "group": 2,
      "period": 3
    },
    "Sc": {
      "struct": "HCP",
      "a": 3.309,
      "c_a": 1.594,
      "rho": 56.2,
      "HV": 736,
      "E_coh": 3.9,
      "ductile": true,
      "alpha": 10.2,
      "group": 3,
      "period": 4
    },
    "Ti": {
      "struct": "HCP",
      "a": 2.951,
      "c_a": 1.587,
      "rho": 39.0,
      "HV": 970,
      "E_coh": 4.85,
      "ductile": true,
      "alpha": 8.6,
      "group": 4,
      "period": 4
    },
    "Co": {
      "struct": "HCP",
      "a": 2.507,
      "c_a": 1.623,
      "rho": 5.6,
      "HV": 1043,
      "E_coh": 4.39,
      "ductile": true,
      "alpha": 13.0,
      "group": 9,
      "period": 4
    },
    "Zn": {
      "struct": "HCP",
      "a": 2.665,
      "c_a": 1.856,
      "rho": 5.92,
      "HV": 412,
      "E_coh": 1.35,
      "ductile": true,
      "alpha": 30.2,
      "group": 12,
      "period": 4
    },
    "Y": {
      "struct": "HCP",
      "a": 3.648,
      "c_a": 1.571,
      "rho": 57.0,
      "HV": 589,
      "E_coh": 4.37,
      "ductile": true,
      "alpha": 10.6,
      "group": 3,
      "period": 5
    },
    "Zr": {
      "struct": "HCP",
      "a": 3.232,
      "c_a": 1.593,
      "rho": 42.1,
      "HV": 903,
      "E_coh": 6.25,
      "ductile": true,
      "alpha": 5.7,
      "group": 4,
      "period": 5
    },
    "Tc": {
      "struct": "HCP",
      "a": 2.735,
      "c_a": 1.604,
      "rho": 22.6,
      "HV": 1550,
      "E_coh": 6.85,
      "ductile": true,
      "alpha": 7.1,
      "group": 7,
      "period": 5
    },
    "Ru": {
      "struct": "HCP",
      "a": 2.706,
      "c_a": 1.582,
      "rho": 7.1,
      "HV": 2160,
      "E_coh": 6.74,
      "ductile": true,
      "alpha": 6.4,
      "group": 8,
      "period": 5
    },
    "Cd": {
      "struct": "HCP",
      "a": 2.979,
      "c_a": 1.886,
      "rho": 7.27,
      "HV": 203,
      "E_coh": 1.16,
      "ductile": true,
      "alpha": 30.8,
      "group": 12,
      "period": 5
    },
    "Hf": {
      "struct": "HCP",
      "a": 3.195,
      "c_a": 1.582,
      "rho": 33.1,
      "HV": 1760,
      "E_coh": 6.44,
      "ductile": true,
      "alpha": 5.9,
      "group": 4,
      "period": 6
    },
    "Re": {
      "struct": "HCP",
      "a": 2.761,
      "c_a": 1.615,
      "rho": 17.2,
      "HV": 2450,
      "E_coh": 8.03,
      "ductile": true,
      "alpha": 6.2,
      "group": 7,
      "period": 6
    },
    "Os": {
      "struct": "HCP",
      "a": 2.734,
      "c_a": 1.58,
      "rho": 8.12,
      "HV": 3920,
      "E_coh": 8.17,
      "ductile": true,
      "alpha": 5.1,
      "group": 8,
      "period": 6
    },
    "Tl": {
      "struct": "HCP",
      "a": 3.456,
      "c_a": 1.599,
      "rho": 15.0,
      "HV": 26,
      "E_coh": 1.88,
      "ductile": true,
      "alpha": 29.9,
      "group": 13,
      "period": 6
    },
    "La": {
      "struct": "HCP",
      "a": 3.75,
      "c_a": 1.619,
      "rho": 61.5,
      "HV": 363,
      "E_coh": 4.47,
      "ductile": true,
      "alpha": 12.1,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Gd": {
      "struct": "HCP",
      "a": 3.634,
      "c_a": 1.59,
      "rho": 131.0,
      "HV": 570,
      "E_coh": 4.14,
      "ductile": true,
      "alpha": 9.4,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Tb": {
      "struct": "HCP",
      "a": 3.601,
      "c_a": 1.581,
      "rho": 115.0,
      "HV": 863,
      "E_coh": 4.05,
      "ductile": true,
      "alpha": 10.3,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Dy": {
      "struct": "HCP",
      "a": 3.593,
      "c_a": 1.574,
      "rho": 92.6,
      "HV": 540,
      "E_coh": 3.04,
      "ductile": true,
      "alpha": 9.9,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Ho": {
      "struct": "HCP",
      "a": 3.578,
      "c_a": 1.57,
      "rho": 81.4,
      "HV": 481,
      "E_coh": 3.14,
      "ductile": true,
      "alpha": 11.2,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Er": {
      "struct": "HCP",
      "a": 3.559,
      "c_a": 1.57,
      "rho": 86.0,
      "HV": 589,
      "E_coh": 3.29,
      "ductile": true,
      "alpha": 12.2,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Tm": {
      "struct": "HCP",
      "a": 3.538,
      "c_a": 1.57,
      "rho": 67.6,
      "HV": 520,
      "E_coh": 2.42,
      "ductile": true,
      "alpha": 13.3,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "Lu": {
      "struct": "HCP",
      "a": 3.504,
      "c_a": 1.585,
      "rho": 58.2,
      "HV": 1160,
      "E_coh": 4.43,
      "ductile": true,
      "alpha": 9.9,
      "group": null,
      "period": 6,
      "notes": "lanthanide"
    },
    "C": {
      "struct": "Diamond",
      "a": 3.567,
      "rho": 10000000000.0,
      "HV": 98000,
      "E_coh": 7.37,
      "ductile": false,
      "alpha": 1.0,
      "group": 14,
      "period": 2
    },
    "Si": {
      "struct": "Diamond",
      "a": 5.431,
      "rho": 100000.0,
      "HV": 11500,
      "E_coh": 4.63,
      "ductile": false,
      "alpha": 2.6,
      "group": 14,
      "period": 3
    },
    "Ge": {
      "struct": "Diamond",
      "a": 5.658,
      "rho": 50000.0,
      "HV": 8000,
      "E_coh": 3.85,
      "ductile": false,
      "alpha": 5.8,
      "group": 14,
      "period": 4
    },
    "As": {
      "struct": "A7",
      "a": 3.76,
      "rho": 26.0,
      "HV": 1500,
      "E_coh": 2.96,
      "ductile": false,
      "alpha": 15.5,
      "group": 15,
      "period": 4
    },
    "Sb": {
      "struct": "A7",
      "a": 4.307,
      "rho": 39.0,
      "HV": 294,
      "E_coh": 2.75,
      "ductile": false,
      "alpha": 11.0,
      "group": 15,
      "period": 5
    },
    "Bi": {
      "struct": "A7",
      "a": 4.746,
      "rho": 107.0,
      "HV": 94,
      "E_coh": 2.18,
      "ductile": false,
      "alpha": 13.4,
      "group": 15,
      "period": 6
    }
  }
}