Holmium oxide is a yellow powder with the chemical formula Ho2O3. It occurs naturally in very small amounts in the rare-earth minerals monazite and gadolinite and as an impurity in other natural mineral compounds. It is one of the most paramagnetic substances known. It is used in refractories and as a catalyst. Its characteristic spectral emission lines are also used to calibrate spectrophotometers.
It is a Substance of Very High Concern (SVHC) according to the REACH Regulations (EC 1907/2006). The safety data presented in this SDS are based on laboratory tests and/or other information. The hazard classifications and precautionary statements do not reflect the hazards associated with exposure to holmium oxide during normal usage or storage.
Its chemical stability is good under recommended storage conditions. It is incompatible with strong oxidizing agents and with acids. It is also corrosive to some metals.
Precautions for Handling
Hazard Statements P302+H312 Harmful if swallowed. H315 Causes skin irritation. H337 May cause respiratory irritation. P280 Do not inhale dust/fume/vapors/spray. P501 Dispose of contents/container in accordance with local, state, national and international regulations.
It is used in refractories, in ceramics and glass applications and as a catalyst. It is also used as an additive in yttrium iron or yttrium aluminum garnet to manufacture metal halide lamps and in thulium-doped fiber lasers. It is also used as a raw material for preparing holmium metal and as a starting material for the preparation of dysprosium holmium lamps.