Tallinn (+372) 56 130 436 sales@duuson.com


Your best materials supplier worldwide

  • 7429-91-6
  • Dy
  • 99.95%
  • 2 inch dia x 0.25 inch th.etc
  • Class 4.1
  • 7429-91-6
  • UN3089
  • PG II





Dysprosium is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster.

Phase at STP: solid

Melting point: 1680 K (1407 °C, 2565 °F)

Boiling point: 2840 K (2562 °C, 4653 °F)

Density (near r.t.): 8.540 g/cm3

when liquid (at m.p.): 8.37 g/cm3

Heat of fusion: 11.06 kJ/mol

Heat of vaporization: 280 kJ/mol

Molar heat capacity: 27.7 J/(mol·K)


Dysprosium is used, in conjunction with vanadium and other elements, in making laser materials and commercial lighting. Because of dysprosium’s high thermal-neutron absorption cross-section, dysprosium-oxide–nickel cermets are used in neutron-absorbing control rods in nuclear reactors.

Dysprosium is used in dosimeters for measuring ionizing radiation.

Dysprosium iodide and dysprosium bromide are used in high-intensity metal-halide lamps. These compounds dissociate near the hot center of the lamp, releasing isolated dysprosium atoms.

Several paramagnetic crystal salts of dysprosium (Dysprosium Gallium Garnet, DGG; Dysprosium Aluminum Garnet, DAG; Dysprosium Iron Garnet, DyIG) are used in adiabatic demagnetization refrigerators.