ytterbium(III) Oxide
Properties
| State | Solid |
| Color | colorless |
| Solubility | Insoluble in water; slowly soluble in dilute mineral acids |
| Melting Point | 2562 °C (approximate) |
About ytterbium(III) Oxide
Ytterbium(III) oxide is a white-to-colorless inorganic oxide, formula Yb2O3, molar mass 394.08 g/mol. Like the other heavier-lanthanide sesquioxides (Tb-Lu), it crystallizes at ambient conditions in the C-type cubic bixbyite structure — the lighter lanthanides La-Nd take the A-type hexagonal form, the middle of the series (Sm-Gd) takes the B-type monoclinic form, and the structural switch tracks the lanthanide contraction in cation radius. Yb2O3 is the canonical entry point into ytterbium chemistry: it's what you get from calcining the carbonate, oxalate, or nitrate in air at 900-1000 °C, and it's the stable bulk form that ships commercially in 99.9% to 99.999% purity drums. The reason laser-materials people care so much about it is that Yb2O3 is the dopant feedstock for Yb:YAG, Yb:silica fiber, and Yb:KGd(WO4)2 — the gain media that have taken over the high-power industrial fiber-laser market. Yb-doped fiber lasers emitting at 1030-1080 nm now do most of the world's metal cutting, welding, and marking, displacing CO2 lasers in factories from Detroit to Shenzhen.
Where you'll encounter it
If you've ever bought a high-end 6-axis laser cutter for sheet metal — anything from IPG Photonics, Trumpf, or Coherent — the gain medium inside is built from a melt that started life as a few hundred grams of Yb2O3. In an MCVD fiber-draw facility, white Yb2O3 powder gets dissolved in dilute HCl, then doped into the silica preform during the soot-deposition step, controlling the final laser's emission profile. In a chromatography lab dedicated to rare-earth separations, Yb2O3 is the reference oxide you weigh out and digest in HNO3 to make ICP-MS standards. And on the back side of the rare-earth supply chain, China produces over 80% of the world's high-purity Yb2O3 from monazite and ion-adsorption clay deposits — which is why ytterbium price moves alongside trade tensions, not just demand from laser-makers.
Common Uses
- Dopant feedstock for Yb:YAG single-crystal growth and Yb:silica fiber laser preforms
- Bulk shipping form for the rare-earth ytterbium supply chain (99.9-99.999% purity)
- Optical glass polishing compound for high-end lens and mirror finishing
- Catalyst and catalyst support in selective hydrogenation and petroleum cracking research
- ICP-MS reference oxide for ytterbium calibration in geochemical and metallurgical analysis
Safety Information
GHS: Eye irritation Category 2A (H319), Skin irritation Category 2 (H315). Acute toxicity is low — Yb2O3 is essentially insoluble in water and most body fluids — but chronic inhalation of any rare-earth-oxide dust can cause pulmonary fibrosis, the same pneumoconiosis pattern documented in cerium-oxide-exposed polishers. No occupational exposure limit exists specifically for ytterbium compounds; default to the general inert-particulate limits for total and respirable dust. Use N95 or P100 respirators when handling fine powder, weigh out in a balance enclosure, and clean spills with damp cloths rather than dry sweeping.
This safety summary is for educational reference only and may not be complete. It is not a substitute for Safety Data Sheets (SDS), medical advice, or professional chemical safety guidance. Always consult appropriate SDS and qualified professionals before handling chemicals. We deliberately do not publish occupational exposure limits or other regulatory thresholds: those values are revised over time and differ between jurisdictions, so the only correct source is the current SDS and the regulations that apply where you work.