{
  "entity": "Gadolinium(III) oxide",
  "formula": "Gd2O3",
  "common_names": ["gadolinium oxide", "gadolinia", "gadolinium sesquioxide", "digadolinium trioxide"],
  "cas_registry_number": "12064-62-9",
  "ec_number": "235-060-9",
  "molecular_weight_g_mol": 362.50,
  "representative_physical_properties": {
    "appearance": "white powder",
    "density_g_cm3": 7.407,
    "melting_point_c": 2420,
    "note": "Density and melting point are representative supplier technical values; verify exact phase, grade, lot and method."
  },
  "application_topics": [
    "neutron-absorbing materials",
    "phosphor host materials",
    "optical glass and ceramics",
    "high-k and thin-film research",
    "precursor for gadolinium compounds",
    "surface-modified nanoparticle MRI research"
  ],
  "procurement_fields": [
    "purity and purity basis (including REO basis)",
    "rare-earth and non-rare-earth impurity limits",
    "D10/D50/D90 particle size and test method",
    "BET surface area where relevant",
    "loss on ignition or moisture",
    "crystal phase where relevant",
    "lot-specific certificate of analysis",
    "current safety data sheet"
  ],
  "important_boundaries": [
    "Industrial Gd2O3 powder is not a clinically approved MRI contrast agent.",
    "Neutron capture by gadolinium can generate secondary gamma radiation; complete shielding requires system-level engineering.",
    "A headline purity percentage does not replace element-specific impurity limits and physical powder specifications.",
    "Technical values must be verified against the exact product specification, COA and SDS."
  ],
  "source_urls": [
    "https://pubchem.ncbi.nlm.nih.gov/compound/Gadolinia",
    "https://webbook.nist.gov/cgi/cbook.cgi?Name=Gd2O3&Units=SI",
    "https://ncnr.nist.gov/resources/n-lengths/list.html",
    "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-rare-earths.pdf",
    "https://www.thermofisher.com/order/catalog/product/036355.14",
    "https://pmc.ncbi.nlm.nih.gov/articles/PMC10303270/",
    "https://www.mdpi.com/2079-4991/15/17/1340"
  ],
  "site": "https://gadoliniumoxide.com",
  "last_reviewed": "2026-09-06"
}