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Application Notes

Molybdenum • Transition Metal

Primary XPS region: Mo3d
Overlapping regions: S2s
Binding energies of common chemical states:

Chemical state Binding energy Mo3d5/2/eV
Mo metal 228.0
MoO2 229.5
MoO3 233.1

Experimental Information

Interpretation of XPS spectra

General comments

crystal structureAbout This Element

Symbol: Mo
Date of Discovery: 1778
Name Origin: Greek molubdos
Appearance: silverish
Discoverer: Carl Wilhelm Scheele
Obtained From: molybdenite, wulfenite

Melting Point: 2890 K
Boiling Point: 4885 K
Density[kg/m3]: 10280
Molar Volume: 9.38 × 10-6 m3/mol
Protons/Electrons: 42
Neutrons: 54
Shell Structure: 2,8,18,13,1
Electron Configuration: [Kr]4d55s1
Oxidation State: 2,3,4,5,6
Crystal Structure: body centered cubic

Molybdenum, a silvery white, very hard, transition metal has one of the highest melting points of all pure elements. Until the eighteenth century, compounds of molybdenum were mistaken as other elements such as lead. In fact, the element is named after the Greek molubdos, meaning “leadlike”. Molybdenum was rarely used until the turn of the twentieth century when a French company, Schneider and Co., discovered its beneficial alloy agent in armor plates. Today, a large percentage of all molybdenum is used in notably high strength alloys and high temperature steels for aircrafts and missiles. Molybdenum also serves as a catalyst in the petroleum industry, extracting organic sulfurs from petroleum products. Equally important, molybdenum is necessary in plant nutrition, and is found in certain enzymes such as xanthene oxidase.

Application Notes

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