Nanografi Nanotechnology

Holmium(Ho) is the one of the lanthanides element with an atomic number 67. Holmium is a soft, bright, silvery-white rare earth metal which is malleable and ductile. Isolated holmium is stable in dry air at room temperature, but it easily reacts with water and corrodes readily. In addition, holmium burns when temperature of air is heated up forming holmium oxide (Ho 2 O 3 ). In most compounds holmium exists in its trivalent state. Holmium reacts with all halogens. The one who discovered holmium was Swedish chemist Per Theodor Cleve. The discovery was made in 1879, but it was 1911 when Swedish botanic Otto Holmberg isolated pure holmium. The French chemist Paul Lecoq de Boisbaudran could only isolate the holmium oxide in 1886 by fractional precipitation. The name holmium comes from the Greek word “Holmia” meaning the old name of Stockholm. Holmium is very reactive element that it almost not possible to find it as pure. Therefore, as other rare earth metals holmium is found in mineral...