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Technical data for Terbium

Click any property name to see plots of that property for all the elements.

Overview
NameTerbium
SymbolTb
Atomic Number65
Atomic Weight158.92535
Density8.219 g/cm3
Melting Point1356 °C
Boiling Point3230 °C

Thermal properties
PhaseSolid
Melting Point1356 °C
Boiling Point3230 °C
Absolute Melting Point1629 K
Absolute Boiling Point3503 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion10.8 kJ/mol
Heat of Vaporization295 kJ/mol
Specific Heat182 J/(kg K)[note]
Adiabatic IndexN/A
Neel Point230 K
Thermal Conductivity11 W/(m K)
Thermal Expansion0.0000103 K-1

Bulk physical properties
Density8.219 g/cm3
Density (Liquid)7.65 g/cm3
Molar Volume0.000019336
Brinell Hardness677 MPa
Mohs Hardness2.33[note]
Vickers Hardness863 MPa
Bulk Modulus38.7 GPa
Shear Modulus22 GPa
Young Modulus56 GPa
Poisson Ratio0.26
Refractive IndexN/A
Speed of Sound2620 m/s
Thermal Conductivity11 W/(m K)
Thermal Expansion0.0000103 K-1

Reactivity
Valence3
ElectronegativityN/A
ElectronAffinity50 kJ/mol
Ionization Energies
565.8, 1110, 2114, 3839 kJ/mol

Health and Safety
DOT Hazard ClassN/A
DOT NumbersN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period6
SeriesLanthanide
Electron Configuration[Xe]6s24f9
ColorSilver
Discovery
1843 in Sweden
Gas phaseN/A
CAS NumberCAS7440-27-9
CID Number
CID23958
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity830000 S/m
Resistivity1.2×10-6 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie Point222 K
Mass Magnetic Susceptibility0.0000136 m3/Kg
Molar Magnetic Susceptibility2.161385×10-6 m3/mol
Volume Magnetic Susceptibility0.1117784

Abundances
% in Universe5×10-8%
% in Sun1×10-8%
% in Meteorites3.9×10-6%
% in Earth's Crust0.000093%
% in Oceans1.4×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius225 pm
Covalent Radius194 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
360.1, 360.1, 569.36 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers6H15/2
Neutron Cross Section23
Neutron Mass Absorption0.009
Known Isotopes
136Tb, 137Tb, 138Tb, 139Tb, 140Tb, 141Tb, 142Tb, 143Tb, 144Tb, 145Tb, 146Tb, 147Tb, 148Tb, 149Tb, 150Tb, 151Tb, 152Tb, 153Tb, 154Tb, 155Tb, 156Tb, 157Tb, 158Tb, 159Tb, 160Tb, 161Tb, 162Tb, 163Tb, 164Tb, 165Tb, 166Tb, 167Tb, 168Tb, 169Tb, 170Tb, 171Tb
Stable Isotopes
159Tb
Isotopic Abundances
159Tb100%


Notes on the properties of Terbium:

Mohs Hardness: converted from Vickers scale

Specific Heat: Value given for solid phase.

Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

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