Interface properties of iron oxide films

Abstract

We have investigated in a systematic way the interface properties of Fe 2 O 3 grown on different buffer layers using an electron beam deposition technique. For films deposited directly onto Si(001) substrate and on Al buffer layer, we observed the presence of metallic Fe at the Si(001) and Al interfaces, respectively. We also detected the presence of SiO 2 and Al 2 O 3 by x-ray photoelectron spectroscopy. For Fe 2 O 3 films deposited on Cu buffer layer, however, no other phases were observed at the interface. We explain our results using the enthalpy of formation. The enthalpy of formation of SiO 2 and Al 2 O 3 is much lower than that of Fe 2 O 3 , thus inhibiting the crystalline growth of Fe 2 O 3 at the interface. The enthalpy of formation of CuO is, however, greater than that of Fe 2 O 3 , and thus promoting the growth of Fe 2 O 3 to be crystalline. These results were corroborated by our transmission electron microscopy studies.

Diffusion and segregation of substrate copper in electrodeposited Ni–Fe thin films

“…In the Fe 2 O 3 /Cu film (oxidized in the atmosphere), it is observed that copper oxide segregates on the surface of iron oxide [37]. These surface energies imply lower interfacial tension of the Cu 2 O in comparison to other possible compounds.…”

XPS and FTIR spectroscopic study on microwave treated high phosphorus iron ore

“…The observed B.E. difference between Fe 2p doublet spectra, i.e., between 2p 3/2 and 2p 1/2 is ∼13.4 corresponding to iron oxide (Fe 2 O 3 ) phase [34,41,42].…”

Optical properties of thin iron oxide films on steel

“…Iron oxides can be produced in several ways, such as electron beam deposition, 3 electrochemically 4 and also thermally. When heated to a temperature of 200-300°C, a duplex film is formed with an underlayer of magnetite (Fe 3 O 4 ) and an overlayer composed of hematite (˛-Fe 2 O 3 ).…”