Naslov
Modification of molybdenum surface by low-energy oxygen implantation at room temperature

Autori
Kavre Piltaver, Ivna ; Jelovica Badovinac, Ivana ; Peter, Robert ; ŠariĆ, Iva ; Petravić, Mladen

Izvornik
Applied surface science (0169-4332) 425 (2017); 416-422

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
molybdenum ; room-temperature oxidation ; XPS ; oxygen implantation

Sažetak
We have studied the initial stages of oxide formation on molybdenum surfaces under 1 keV O2+ ion bombardment at room temperature (RT), using x-ray photoelectron spectroscopy around Mo 3d or O 1s core-levels and the valence band photoemission. The results are compared with the oxidation mechanism of thermally oxidized Mo at RT. The thermal oxidation reveals the formation of a very thin MoO2 layer that prevents any further adsorption of oxygen at higher oxygen doses. Oxygen implantation is more efficient in creating thicker oxide films with the simultaneous formation of several oxide compounds. The oxidation rates of MoO2 and Mo2O5 follow the parabolic growth rate consistent with the mass transport driven by diffusion of either neutral or singly and doubly charged oxygen interstitials. The oxidation of MoO3, which occurs at a later oxidation stage, follows the logarithmic rate driven by the diffusion of cations in an electric field.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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