Abstract
Optical constants n and k of polycrystalline films of aluminum and Al–4.45 at % La alloy have been measured at room temperature. The optical conductivity spectra for the clean and oxidized surfaces of the above systems have been obtained based on these data. When analyzing the results of comparison of these spectra with the model ones, the electronic characteristics of optical transitions, including the characteristics of the surface states of electrons, have been obtained. It has been shown that the conduction band of these systems was multiply split. It has been demonstrated that the center of gravity of the contribution to the optical-conductivity spectrum from the surface states of electrons for the alloy was shifted towards lower energy values, as compared with a similar contribution for the aluminum film. The value of the heat of oxygen adsorption on the surface of aluminum and alloy has been calculated. It has been established that the equilibrium position of the adsorption–desorption processes of above-mentioned systems at room temperature is shifted towards desorption, while the heat of oxygen desorption on the surface of the Al–4.45 at % La alloy is significantly lower than the desorption heat for the aluminum film.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
Kress, K.A. and Lapeyre, G.J., Phys. Rev. Lett., 1972, vol. 28, p. 1639.
Kononenko, V.I. and Shevchenko, V.G., Fizikokhimiya aktivatsii dispersnykh sistem na osnove alyuminiya (Physical Chemistry for Activating Aluminum-Based Disperse Systems), Yekaterinburg: Ural Branch Russ. Acad. Sci., 2006.
Kiselev, A.I., Shevchenko, V.G., and Popov, N.A., Prot. Met. Phys. Chem. Surf., 2019, vol. 55, no. 2, p. 243.
Rzhanov, A.V., Osnovy ellipsometrii (Fundamentals for Ellipsometry), Novosibirsk: Nauka, 1978.
Archer, R.J., J. Opt. Soc. Am., 1962, vol. 52, no. 9, p. 970.
Drude, P., The Theory of Optics, New York: Longmans, Green & Co., 1902.
Kiselev, A.I., Kononenko, V.I., and Akashev, L.A., High Temp., 2002, vol. 40, no. 1, p. 44.
Kovalenko, N.P., Krasnyi, Yu.P., and Triger, S.A., Statisticheskaya teoriya zhidkikh metallov (Statistical Theory of Liquid Metals), Moscow: Nauka, 1990.
Motulevich, G.P., Tr. Fiz. Inst., Akad. Nauk SSSR, 1971, vol. 55, p. 3.
Akashev, L.A. and Kononenko, V.I., High Temp., 2001, vol. 39, no. 3, p. 384.
Kiselev, A.I., Akashev, L.A., and Kononenko, V.I., High Temp., 2004, vol. 42, no. 5, p. 710.
Kiselev, A.I., Shevchenko, V.G., Konyukova, A.V., and Mozgovoi, A.G., Prot. Met. Phys. Chem. Surf., 2011, vol. 47, no. 2, p. 167.
Zinov’ev, V.E., Teplofizicheskie svoistva metallov pri vysokikh temperaturakh. Spravochnik (Thermophysical Properties of Metals under High Temperatures. Handbook), Moscow: Metallurgiya, 1989.
Golovashkin, A.I., Levchenko, I.S., and Motulevich, G.P., Fiz. Tverd. Tela, 1978, vol. 20, no. 10, p. 3061.
Kazenas, E.K. and Tsvetkov, Yu.V., Termodinamika ispareniya oksidov (Thermodynamics of Oxides Evaporation), Moscow: LKI, 2008.
Savitskii, E.M. and Terekhova, V.F., Metallovedenie redkozemel’nykh metallov (Metal Science of Rare Earth Metals), Moscow: Nauka, 1975.
Funding
The present work was carried out in accordance with state order no. AAAAA-A19-119031890028-0 (functional unit no. 2).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by D. Marinin
Rights and permissions
About this article
Cite this article
Kiselev, A.I., Akashev, L.A. & Popov, N.A. Surface Properties of Films Composed of Aluminum and Its Alloy with Lanthanum. Prot Met Phys Chem Surf 58, 308–317 (2022). https://doi.org/10.1134/S2070205122020083
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S2070205122020083