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3.2 Chemical composition Figure 3.12: Surface distribution of elements in sample S-12AOw. - A homogeneous distribution of samarium and nickel, with a slightly depleted surface area in favour of oxidized chromium presence. the distorted perovskite structure of samarium nickelate, also causes build-up of contaminations on the surface of deposited films. Contamination of annealed film includes mainly chromium. However XRF experiments do not specify in what chemical form chromium is present on the surface. That was resolved by X-ray photoelectron spectroscopy experiments. As shown un comparison between survey spectra of S-42Aw and S-42An samples (figure 3.14) there is a difference in composition between the annealed and as-deposited sample. The main 2p3/2 chromium line was resolved and according to literature its components correspond to, among others, chromium oxides Cr2O3 (54), CrO3 (10), Cr2O (58) or complex metal oxides (10). The fitting of chromium spectrum in sample S-42Aw is shown in figure 3.15 73PDF Image | Investigation of metal-insulator transition in magnetron sputtered samarium nickelate thin films
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