Surface oxidation of ferrochromium thin films
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Oxidation kinetics of ferrochromium (Cr 72 wt%, Fe 28 wt%) films of different thicknesses were followed at room temperature in the laboratory atmosphere by noting the conductivity of vacuum-deposited films as a function of time for a period of 150 minutes. A logarithmic oxidation growth with two different rate constants is obtained. X-ray diffraction analysis of 50 nm thick films at various temperatures indicated a solid solution of chromium and iron-chromium oxides. A decrease of lattice spacing observed with temperature increase is attributed to composition/structural changes near the metal-oxide interface. Microstructures of these film surfaces reveal the formation of bluish green crystals of Cr2O3 at 773 K.
KeywordsMicrostructure Chromium Solid Solution Diffraction Analysis Film Surface
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