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 specific OSHA PEL exists for ytterbium compounds; default to the inert/respirable particulate limit of 15 mg/m3 total dust and 5 mg/m3 respirable. 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.