Molybdän (Mo)

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Molybdän 42Mo95.94

1781 von P.J. Hjelm in Uppsala, Schweden, dargestellt.

[Griechisch, molybdos = Blei]

French: Molybdène
English: Molybdenum
Italian: Molibdeno
Spanish: Molibdeno


Beschreibung: Das Metall ist glänzend, silberfarbig und in einem reinem Zustand ziemlich weich. Man erhält es gewöhnlich als graues Pulver. Verwendung: Legierungen, Elektroden und Katalysatoren.

 

 

Molybdän single crystal properties

State: single crystal
Crystal structure: bcc
Production method: Floating Zone
Standard size: diameter 8-12mm
thickness 1-2mm
Orientation: (100), (110) and (111)
Orientation accuracy: <2°, <1°, <0.4° or <0.1°
Polishing: as cut, one or two sides polished
Roughness of surface: <0.03µm
Purity: 99.99%
Typical analysis (ppm): C 3
H < 1
O 9
N < 5
Cu 1.60
Fe 1.80
Ni < 1
Pb 0.30
Si 0.30

 
Ga, Hf and Ta are below the detection limit
 

Materials properties

Density: 10.2 g/cm3
Melting point: 2616.85 °C / 2890 °K
Boiling point: 4611.85 °C / 4885 °K
Molar volume: 9.39 cm3
Thermal conductivity: 138 [300 K] Wm-1K-1
Coefficient of linear thermal expansion: 5.43 x 10-6 K-1
Electrical resistivity: 5.2x 10-8 [273 K] Wm
Mass magnetic susceptibility: +1.2 x 10-8(s) kg-1m3
Young's modulus: 324.8 GPa
Rigidity modulus: 125.6 GPa
Bulk modulus: 261.2 GPa
Poisson's ratio: 0.293 GPa
Radii: Mo6+ 62; Mo2+ 92; atomic 136; covalent 129
Electronegativity: 2.16 (Pauling); 1.30 (Allred); 3.9 eV (absolute)
Effective nuclear charge: 3.45 (Slater); 6.98 (Clementi); 9.95 (Froese-Fischer)
Number of Isotopes (incl. nuclear isomers): 23
Issotope mass range: 88 -> 106
Crystal structure, (cell dimentions / pm), space group bcc
X-ray diffraction: mass absorption coefficients: CuKα 162 (µ/r) / cm2g-1
MoKα 18.4 (µ/r) / cm2g-1
Neutron scattering length: 0.6715 b/10-12 cm
Thermal neutron capture cross-section: 2.60 sa / barns

 

Biological data

Biological role: essential to all species.
Toxicity  
Toxic intake: n.a.
Lethal intake: LD50 (MoO2, subcutaneous, mouse)=318 mg kg-1
Hazards: Animal experiments show molybdenum compunds to be highly toxic and teratogenic, but there is little human data.
Level in humans  
Blood: c. 0.001 mg dm-3
Bone: <0.7 p.p.m.
Liver: 1.3 - 5.8 p.p.m.
Muscle: 0.018 p.p.m.
Daily dietary intake: 0.05 - 0.35 mg
Total mass of element in average [70 kg] person: 5 mg

 

Geological data

MineralFormulaDensityHardnessCrystal apperance
Molybdenite MoS2 4.7 1 - 1.5 hex. met. grey
Wulfenite PbMoO4 6.78 2.7 - 3 tet., res. adam. orange

 

Chief ore: molybdenite; wulfenite to lesser extent; also obtained as by-product of copper production.
World production: 80 000 tonnes/year
Main mining areas: USA, Australia, Italy, Norway, Bolivia
Reserves: 5 x 106 tonnes
Specimen: available as foil, powder rod or wire. Safe.

 

Abundances  
Sun: 145 (relative to H = 1 x 1012)
Earth's crust: 1.5 p.p.m.
Seawater:  
Residence time:  
Classification: accumulating
Oxidation state: VI

Übersicht der Elemente mit Zugang zu unserem Shop

1 18
H
 2 13 14 15 16 17
He
Li Be B C
N
O
F
Ne
Na Mg 3 4 5 6 7 8 9 10 11 12 Al Si P S
Cl
Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se
Br
Kr
Rb Sr Y Zr Nb Mo
Tc
 Ru Rh Pd Ag Cd In Sn Sb Te I
Xe
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi
Po
At
Ra
Fr
Ra
Ac
Ce Pr Nd
Pm
 Sm Eu Gd Tb Dy Ho Er Tm Yb Lu


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