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Gd₂O₃ and Gd-containing high-k oxide research

Rare-earth oxides have been investigated as high-k dielectric materials. For electronic applications, film quality and interface chemistry matter at least as much as the bulk oxide formula.

Reviewed: 6 September 2026 · Source-linked technical synthesis
Conceptual Gd2O3 high-k dielectric thin film stack
Conceptual device stack. Research devices can use different electrodes, substrates and Gd-containing compositions.

Why Gd-containing oxides are studied

High-k dielectrics aim to provide high capacitance while maintaining a physically thicker insulating layer than an equivalent SiO₂ film. Rare-earth oxides have attracted research interest because of their dielectric properties, band alignment possibilities and thermal behavior. Studies have reported Gd₂O₃ films deposited by methods including atomic layer deposition.

Bulk powder data does not predict thin-film device performance

Electrical behavior depends on film stoichiometry, density, phase, thickness, roughness, interface traps, oxygen vacancies, precursor residues and annealing. A powder product specification is therefore not a thin-film specification.

What matters in a deposition program

  • Deposition precursor volatility and reactivity.
  • Substrate surface preparation and interfacial layer formation.
  • Oxygen stoichiometry and carbon/halogen residues.
  • Anneal temperature and atmosphere.
  • Thickness uniformity and roughness.
  • Dielectric constant, leakage current, hysteresis and breakdown behavior.

Where oxide powder may still fit

High-purity Gd₂O₃ can serve as a starting material for target fabrication, ceramic sources, synthesis of deposition precursors or other process-specific routes. The correct form — powder, pellet, target or precursor — should be specified before purchasing.

References

  1. PubChem. “Gadolinia / Gadolinium oxide (Gd₂O₃), CID 159427.” Molecular formula, molecular weight, identifiers and safety data. pubchem.ncbi.nlm.nih.gov.
  2. NIST Chemistry WebBook. “digadolinium trioxide.” Formula, molecular weight and CAS Registry Number. webbook.nist.gov.
  3. NIST Center for Neutron Research. “Neutron Scattering Lengths and Cross Sections.” Includes absorption cross sections for ¹⁵⁵Gd and ¹⁵⁷Gd. ncnr.nist.gov.
  4. U.S. Geological Survey. Mineral Commodity Summaries 2026 - Rare Earths. Supply and end-use context for rare-earth materials. usgs.gov.
  5. Thermo Fisher Scientific Chemicals. Gadolinium(III) oxide product specifications and SDS, CAS 12064-62-9. thermofisher.com.
  6. American Elements. Gadolinium oxide technical data including density and melting point. americanelements.com.
  7. Recent Progress in Gd-Containing Materials for Neutron Shielding Applications: A Review. Open-access review discussing Gd₂O₃ in glass, polymers, concrete and metals. PMC.
  8. Review on the synthesis, structural and photo-physical properties of Gd₂O₃ phosphors for various luminescent applications. Optik. ScienceDirect.
  9. Current Status and Future Aspects of Gadolinium Oxide Nanoparticles as Positive MRI Contrast Agents. Nanomaterials (2025). Research context and clinical-translation caveats. MDPI.
  10. Atomic Layer Deposition of Gd₂O₃ and Dy₂O₃. Chemistry of Materials. Thin-film structure and electrical-property research. ACS Publications.