Iron oxide thin films

M. F. Toney and S. Brennan. Structural Depth Profiling of Iron Oxide Thin Films using Grazing Incidence Asymmetric Bra X-ray DiflFraction. J. Appl. Phys. 65J 4763, 1989. 

An example of this process of data analysis is provided by the work of Yubero et al. (2000), who studied the structure of iron oxide thin films prepared at room temperature by ion beam induced chemical vapour deposition. Such films find important applications because of their optical, magnetic, or magneto-optical properties. They were produced by bombardment of a substrate with Oj or Oj + Ar+ mixtures, and Figure 4.15 shows RBS spectra of two iron oxide thin films prepared on a Si substrate by each of these bombardment methods. 

Figure 4.15. RBS characterisation of iron oxide thin films prepared with ion bombardment with (a) Oj or (b) Oj + Ar+ mixture. Dots raw data. Full lines RUMP simulations. (Reproduced by permission of...

Miller, E., Rocheleau, R., Khan, S. 2004. A hybrid multijunction photoelectrode for hydrogen production fabricated with amorphous silicon/germanium and iron oxide thin films. Int J Hydrogen Energy 29 907-914. 

Gonzalez-Elipe, A.R. (2000 a) Iron oxide thin films prepared by ion beam induced chemical vapour depositions. Structural characterization by infrared spectroscopy. J. Vac. 

Hida Y, Kozuka H (2005) Photo anodic properties of sol-gel-derived iron oxide thin films with embedded gold nanoparticles Effects of polyvinylpyrrolidone in coating solutions. Thin Solid Films 476 264-271... 

Lamrani, M.A. Regragui, M. Erguig H. (2006) Physicochemical, optical and electrochemical properties of iron oxide thin films prepared by spray pyrolysis. Appl Surf Sci 253 1823-1829... 

Takagi, Y., Kikuchi, T., Mizutani, T., Imafuku, M., Sasaki, S., and Mori, T., Upgrade of triple-axis/four-circle diffractometer at PF-BL3A, Rev. Sci. Instrum. 66,1802,1995. Huang, T.C., Toney, M.F., Brennan, S., and Rek, Z., Analysis of cobalt-doped iron oxide thin films by synchrotron radiation. Thin Solid Films 154, 439, 1987. Scherrer, R, Estimation of Size and Internal Structure of Colloidal Particles by Means of Rontgen Rays, Gdttinger Nachrichten 2, 98, 1918. King, H.P and Alexander, L.E. X-ray diffraction procedures, WUey, New York, 1954. 

Ortiz, C., Lim, G., Chen, M. M. Castillo, G. (1988). Physical properties of spinel iron oxide thin films. Journal of Materials Research, 3, 344-50. 

Fig. 9 Scanning electron micrograph of iron oxide thin films prepared from (a) ultrasonic spray pyrolysis and (b) conventional spray pyrolysis of Fe(acetylacetonate)3 solutions. (Reproduced with permission from [71])...

Oblonsky, L.J., Virtanen, S., Schroeder, V. and Devine, T.M. (1997) Surface-enhanced Raman spectroscopy of iron oxide thin films comparison with the passive film on iron. Journal of The Electrochemical Society, 144, 1604—1609. 

S. Ohta, A. Terada, Y. Ishii, and S. Hattori, Thickness dependence of magnetic properties and read-write characteristics for iron oxide thin films. Trans. Inst. Electr. Commun. Eng. Jpn. E68 (1985)... 

Ingler WB Jr, Baltrus JP, Khan SUM (2004) Photoresponse of p type zinc doped iron(lll) oxide thin films. J Am Chem Soc 126 10238-10239... 

Metal Treatment. After rolling, the oxide scale on sheet steel is removed by acid treatment (pickling) (see Metal surface treatments). Phosphoric acid, a good pickling agent, leaves the steel coated with a thin film of iron phosphates. This process improves mst resistance but presents a problem if the steel is to be electroplated. 

Oxygen from the atmosphere, dissolved in the electrolyte solution provides the cathode reactant in the corrosion process. Since the electrolyte solution is in the form of thin films or droplets, diffusion of oxygen from the atmosphere/electrolyte solution interface to the solution/metal interface is rapid. Moreover, convection currents within these thin films of solution may play a part in further decreasing concentration polarisation of this cathodic process . Oxygen may also oxidise soluble corrosion products to less soluble ones which form more or less protective barriers to further corrosion, e.g. the oxidation of ferrous species to the less soluble ferric forms in the rusting of iron and steel. 

The current-potential relationship ABCDE, as obtained potentiosta-tically, has allowed a study of the passive phenomena in greater detail and the operational definition of the passive state with greater preciseness. Bonhoeffer, Vetter and many others have made extensive potentiostatic studies of iron which indicate that the metal has a thin film, composed of one or more oxides of iron, on its surface when in the passive state . Similar studies have been made with stainless steel, nickel, chromium and other metals... 

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