Terbium

Metall

solid

Symbol: Tb
Atomic number: 65
Atomic mass: 158.92534
Group: Lanthanoid
CAS-number: 7440-27-9

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Physical data

Electronic data	Thermal data	Steric data
Shells: 2, 8, 18, 27, 8, 2 Orbitals: [Xe] 4f⁹ 6s² Electronegativity: --, 1.1 1. Ionization potential: 5.8639 eV 2. Ionization potential: 11.525 eV 3. Ionization potential: 21.91 eV Oxidation states: 4, 3 Electrical conductivity: 0.00889 10^6	Melting point: 1356 °C Boiling point: 3230 °C Specific heat: 0.18 J/gK Heat of fusion: 10.80 kJ/mol Heat of vaporization: 330.90 kJ/mol Thermal conductivity: 0.111 W/cmK	Atomic radius: 2.51 Å Ionic radius: 1.18 Å (+3) Covalent radius: 1.59 Å Atomic volume: 19.2 cm³/mol Density (293 K): 8.27 g/cm³ Crystal structure: hexagonal

Isotopes

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
¹⁵¹Tb	0	151	1/2	17.61h	EC, β+, α	View
¹⁵⁵Tb	0	155	3/2	5.3d	EC	View
¹⁵⁶Tb	0	156	3	5.3d	EC	View
¹⁵⁷Tb	0	157	3/2	1.1E02y	EC	View
¹⁵⁸Tb	0	158	3	1.8E02y	EC, β-	View
¹⁵⁹Tb	100	159.925	3/2	--	--
¹⁶⁰Tb	0	160	3	72.3d	β-	View
¹⁶¹Tb	0	161	3/2	6.91d	β-	View
¹⁶²Tb	0	162	1	7.6m	β-	View

Other info

Name origin:	Benannt nach Ytterby, einem Dorf in Schweden.
Description:	Weiches, geschmeidiges, silbrig-graues Seltenerdmetall.
Discovered by:	Carl Mosander
Year:	1843
Place:	Schweden
Sources:	Gefunden mit anderen seltenen Erden in Monazit-Sand, welches typischerweise 0,03% Terbium enthält. Andere Quellen sind Xenotim und Euxenit, beides Oxid-Mischungen, die bis zu 1% Terbium enthalten können.
Use(s):	Es wird in geringen Mengen in speziellen Laser-und Solid-State-Geräten verwendet.