Dysprosium is a silvery metal of the lanthanide group. It is relatively stable in air, reacts violently with water and dissolves in acids. Applications for this element are limited, but it is used as an alloying element to produce an alloy used for magnets, and as a poison in nuclear reactors where it stops the reaction from getting out of hand.


Good at absorbing neutrons and so it is used in dysprosium-oxide-nickel cement in control rods in nuclear reactors.

P.E. Lecoq de Boisbaudran in 1886 in Paris, France.

6 ppm in the Earth’s crust.

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Atomic number 66 Clip
Atomic / Molecular Weight 162.5 gmol-1Clip
Density 8531 kgm-3Clip
Lattice constant 359 fmClip
Melting Point 1683 KClip
Boiling Point 2833 KClip
Specific heat capacity 172 Jkg-1K-1Clip
Thermal conductivity 10.5 Wm-1K-1Clip
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See also: Dysprosium III Oxide, Periodic Table.

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Subjects: Chemistry