Wednesday, March 27, 2013



  • Holmium was discovered by Delafontaine and Soret in 1878 AD. It is a soft silvery metallic element, which is found in the lanthanide series of inner transition metals in Group III a of the periodic table.
  • Holmium occurs with the rare earths in their ores. It is separated from other rare earths by ion exchange chromatography. It is prepared by reducing the anhydrous chloride with calcium .which is stable in air. It has unusual magnetic properties. It is used in the filters used for the calibration of the wavelength settings in UV spectrophotometers.
  • It is usually commercially extracted from monazite using ion exchange techniques. Its compounds in nature, and in nearly all of its laboratory chemistry, are trivalently oxidized, containing Ho(III) ions. Trivalent holmium ions have fluorescent properties similar to many other rare earth ions (while yielding their own set of unique emission light lines), and holmium ions are thus used in the same way as some other rare earths in certain laser and glass colorant applications.

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