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    "description": "Spontaneous polarization of lithium niobate (LiNbO3): 2 provenance-tagged value(s) from 2 source(s) for variant(s) cln. Each value carries conditions, uncertainty, the source locator and a status code (P primary, P-comp compilation, P-db database, S secondary, V vendor, C computed).",
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    "name": "LiNbO3 Spontaneous polarization",
    "url": "https://lithium-niobate.com/api/v1/properties/spontaneous-polarization.json",
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        "name": "Spontaneous polarization",
        "unitText": "uC/cm2"
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    "api_version": "v1",
    "attribution": "lithium-niobate.com data compiled by Wentao Jiang; cite the original sources listed per value.",
    "count": 2,
    "data_version": "0.1.0",
    "documentation": "https://lithium-niobate.com/api/openapi.json",
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      "name": "Creative Commons Attribution 4.0 International",
      "url": "https://creativecommons.org/licenses/by/4.0/"
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    {
      "category": "ferroelectric",
      "id": "spontaneous-polarization/cln/gopalan1998",
      "kind": "scalar",
      "name": "Spontaneous polarization",
      "notes": "Abstract: insensitive to stoichiometry and H content.",
      "property": "spontaneous-polarization",
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        "value": 5
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      "variant_note": "abstract gives the value for CLN and near-SLN alike"
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    {
      "category": "ferroelectric",
      "conditions": {
        "temperature_text": "room temperature"
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      "id": "spontaneous-polarization/cln/volk2008",
      "kind": "scalar",
      "name": "Spontaneous polarization",
      "notes": "Mismatch with gopalan1998 (80 +- 5). volk2008 ref. [24] (APL 73, 3073) is a LiTaO3 paper per Crossref.",
      "property": "spontaneous-polarization",
      "provenance": {
        "locator": "Table 1.1, p. 3 (refs. [22], [24])",
        "source_id": "volk2008",
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      "symbol": "P_s",
      "unit": {
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      "value": 71,
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