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  • 7440-30-4
  • Tm
  • 99.9%
  • <6mm
  • Class 4.1
  • 231-140-2
  • UN3089
  • PG III

Description

Characteristic

Thulium is a chemical element with the symbol Tm and atomic number 69. It is the thirteenth and third-last element in the lanthanide series.

Phase at STP: solid

Melting point: 1818 K (1545 °C, 2813 °F)

Boiling point: 2223 K (1950 °C, 3542 °F)

Density (near r.t.): 9.32 g/cm3

when liquid (at m.p.): 8.56 g/cm3

Heat of fusion: 16.84 kJ/mol

Heat of vaporization: 191 kJ/mol

Molar heat capacity: 27.03 J/(mol·K)

Application

Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices, and in some solid-state lasers. It has no significant biological role and is not particularly toxic.