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2.1 X-ray Diffraction Figure 2.2: XRD patten of SNO powder. - The pattern presents intensities of Bragg reflections of a proper polycrystalline sample. A bit of NiO impurity is also visible. As featured in (66) Figure 2.3: Axes and angles in an XRD measurement - The standard re- flected and diffracted beam angles as well as other angles used in pole figure mea- surements are explained. identification of obtained diffraction peaks. For polycrystalline structure there is by far less uncertainty than when a film is strongly textured. A strong crystalline texture may result in suppression of most of the diffraction peaks regardless of their intensity. A careful determination of the peak origin is therefore necessary. The appearance of a strong texture in the investigated films lead to further in- vestigation through a pole figure method. It is a basic method for investigation of epitaxial or textured materials. The idea behind the method is to measure the intensity of a selected diffraction peak present in the standard pattern, in 3D space by varying the angular position of the sample: Ψ and Φ as in figure 2.3. The obtained intensities are depicted as a stereographic or equal-area projection. 39PDF Image | Investigation of metal-insulator transition in magnetron sputtered samarium nickelate thin films
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