{
  "alternatives": [],
  "meta": {
    "api_version": "v1",
    "attribution": "lithium-niobate.com data compiled by Wentao Jiang; cite the original sources listed per value.",
    "data_version": "0.1.0",
    "documentation": "https://lithium-niobate.com/api/openapi.json",
    "license": {
      "id": "CC-BY-4.0",
      "name": "Creative Commons Attribution 4.0 International",
      "url": "https://creativecommons.org/licenses/by/4.0/"
    },
    "property": "dark-conductivity",
    "variant": "cln"
  },
  "recommended": [
    {
      "category": "electrical",
      "conditions": {
        "temperature_text": "room temperature, extrapolated from high temperature"
      },
      "default": true,
      "id": "dark-conductivity/cln/volk2008",
      "kind": "scalar",
      "max": 1e-14,
      "min": 1e-16,
      "name": "Dark conductivity",
      "notes": "Protonic conduction; activation energy about 1.1 eV (200-1000 C). 8-10 orders of magnitude below the 1.0e-6 S/m floor fitted in bouchy2022.",
      "property": "dark-conductivity",
      "provenance": {
        "locator": "Sec. 3.2.1, pp. 59-60 (1e-16 to 1.0e-18 Ohm^-1 cm^-1)",
        "source_id": "volk2008",
        "status": "P-comp",
        "transcribed": "2026-10-25"
      },
      "public": true,
      "symbol": "sigma_d",
      "unit": {
        "display": "S/m",
        "ucum": "S/m"
      },
      "variant": "cln",
      "variant_note": "undoped or slightly doped CLN"
    }
  ],
  "recommended_note": null,
  "spread": null
}