What do you mean by holmium?

holmium, pronounced huǒ, initial h, vowel uo, with three tones.

Holmium is a chemical element, its chemical symbol is ho, and its atomic number is 67, which belongs to lanthanide and one of the rare earth elements. Holmium is a solid at normal temperature and pressure. It was discovered by Sorett in 1878 and by Cliff in 1879.

holmium * * * has 35 isotopes, of which 165Ho is the most stable, and the rest are synthetic radioactive isotopes.

Use of Holmium

1. Used as an additive for metal halogen lamps.

metal halogen lamp is a kind of gas discharge lamp, which is developed on the basis of high-pressure mercury lamp, and its characteristic is that the bulb is filled with various rare earth halides. Rare earth iodide is mainly used, which emits different spectral lines when gas is discharged. The working substance used in holmium lamp is holmium iodide, which can obtain higher metal atom concentration in the arc region, thus greatly improving the radiation efficiency.

2. Holmium can be used as an additive of yttrium iron or yttrium aluminum garnet.

3. A small amount of holmium can also be added to magnetostrictive alloy Terfenol-D, thus reducing the external field required for saturation magnetization of the alloy.

above content reference: Baidu Encyclopedia-Holmium