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Europium


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Other names/abbreviations: Eu



Element no: 63
Element group: Lanthanides
Element type: Inner transition metals
CAS-Number: 7440-53-1
EINECS-Number: 231-161-7



Physical properties

Appearance

Physical state @ 20°C: Solid
Color: Silvery white


Bulk properties

Molecular weight (g/mol): 151.964 [1]
Melting point (°C): 822 [1]
Boiling point (°C): 1429 [1]
Density (g/cm3): 5.234 [1]
Molar volume (cm3): 28.90 (20 °C) [2]
Elastic properties:
Young's modulus (GPa):
Rigidity modulus (GPa):
Bulk modulus (GPa):
Poisson ratio:
15.5 [2]
7.9 [2]
8.3 [2]
0.152 [2]


Thermodynamic properties

ΔH°atomization (KJ/mol): 178 [1]
ΔfH°gas (KJ/mol): 175.3 [3]
ΔfH°solid (KJ/mol): 0.0 [3]
ΔH°fusion (KJ/mol): 9.21 [3]
ΔH°vaporization (KJ/mol): 176 [1]


S°gas (J/K·mol): 176 [1]
S°solid (J/K·mol): 77.8 [3]


ΔfG°gas (kJ/mol): 142.2 [3]


Cp (gas) (J/K·mol): 20.8 (25 °C) [3]
Cp (solid) (J/K·mol): 27.66 (25 °C) [3]


Coeff. of linear thermal expansion (106 K-1): 35 (25 °C) [3]


Crystal structure

Crystal type: Body centered cubic [2]


Electronic properties

Electron configuration: 1s2-2s2-2p6-3s2-3p6-3d10-4s2-4p6-4d10-4f7-5s2-5p6-6s2
Ionic radius (Å): Eu(III): 0.947 (6-coordinate) [1]
Eu(II): 1.17 (6-coordinate) [1]


Conductivity

e°(V): Eu(III)/Eu(II): -0.35 [1]
Eu(III)/Eu: -1.99 [1]
Electrical resisitvity (μΩ·cm): 81.00 (20 °C) [2]
116.00 (25 °C) [2]
Thermal (W/m·K): 14 (27 °C) [3]


References

1: Greenwood,N.N., Earnshaw,A. Chemistry of the elements
2nd edition (1997) Edited by Greenwood,N.N., Earnshaw,A. pp. 1-1340, Butterworth-Heinemann. Oxford. Great Britain

2: Buch,A. Pure Metals Properties. A Scientific-Technical Handbook
1st edition (1999) Edited by Buch,A. pp. 1-306, ASM International and Freund Publishing House Ltd. Ohio. USA

3: CRC Handbook of Chemistry and Physics
75th edition (1994) Edited by Lide,D.R. , CRC Press Inc. Boca Raton, USA







© Michael Pilgaard
Created: September 29, 2008