Holmium brand chemical composition
Holmium — rare earth element in Group III of Mendeleev’s system, which is designated as Ho. Chemical number 67. The atomic weight of 164.93. It is a stable isotope of the lanthanide group, a soft metal light gray color, very ductile and malleable. Prepared by reduction of calcium fluoride HoF 3. Swiss scientist J… Sore discovered this metal by spectral analysis in the «erbium earth.» A chemist P. Cleve of Sweden was able to highlight the holmium oxide and named the element in honor of the ancient name of the Swedish capital Holmia. Holmium is dissolved in the oceans in the amount of 2,2×10 -7%, its content in the lithosphere of 1,3×10 -4%. It is most commonly found with others. REE in apatite, bastenezite, gadolinium, monazite. The chemical compound is oxidized to +3. Stable in the atmosphere of fluorine. With increasing temperature reacts with nitrogen, bromine, hydrogen, chlorine.
|Atomic number Ho||The atomic (molar) mass g / mol||The degree of oxidation||Density [g / cm3]||Melting point t ° C||The boiling point of t ° C||The heat of fusion kJ / kg|
|number 67||164.93||3||8.8||1474 ° C||2695 ° C||301|
This rare earth metal refers to non-ferrous metals. It is used in the production of laser and thermoelectric materials, metallurgy, microelectronics, nuclear energy (holmium borate). holmium ions generate laser radiation in the infrared part of the spectrum with a wavelength of 2 microns. Holmium is used to produce powerful magnetic fields in the manufacture of superconducting magnets of the pole pieces. It is indispensable alloy holmium, erbium +. Radioactive isotope 166 Ho-used in analytical chemistry as tracer. Holmium salts are relevant in the production of special glasses and as an activator phosphors. This produces metal rods, sheet, wire, tape. GOST 23 862.3−79 normalizes the content of impurities holmium oxide, determined by spectral analysis.
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