Dysprosium

Kemiallinen merkki: Dy
Järjestysluku: 66
Kategoria: lantanoidit
Ryhmä: n/a
Jakso: 6
Lohko: f
Moolimassa: 162,500 g/mol
Elektronia kuorilla: 2, 8, 18, 28, 8, 2
CAS-numero: 7429-91-6
Olomuoto: kiinteä
Tiheys: 8,540 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1680 K (1407 °C, 2565 °F)
Kiehumispiste: 2840 K (2562 °C, 4653 °F)
Kiderakenne: hexagonal
Hapetusluvut: 3
Elektronegatiivisuus: 1,22 (Pauling-asteikko)
Nimen alkuperä: dysprositos
Nimen tarkoitus: a Greek word which means 'hard to get' - the discoverer tried to isolate the element more than 30 times
Faktoja:
- is a rare earth element with a metallic silver luster
- is never found in nature as a free element, though it is found in various minerals, such as xenotime
- is relatively stable in air at room temperature, but it dissolves readily in min
- is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility to magnetization in data storage devices and as a component of Terfenol-D (a metal alloy)
- soluble dysprosium salts are mildly toxic, while the insoluble salts are considered non-toxic
- has no known biological role
- most dysprosium is being obtained from the ion- adsorption clay ores of southern China
- is used, in conjunction with vanadium and other elements, in making laser materials
- Dy powder may present an explosion hazard when mixed with air and when an ignition source is present
- dysprosium fires cannot be put out by water - it can react with water to produce flammable hydrogen gas