Solid State Phenomena Vol. 130

Abstract: Application of the Rietveld method to quantitative phase analysis of fly ashes from Polish power stations is presented. The calculations of the fractions of crystalline components as well as non crystalline constituents have been done using SIROQUANT TM software. The power of the Rietveld refinement is shown when very small contents of minerals are detected and quantified.

Abstract: Grazing incident X-ray diffraction technique was applied to determine the influence of incident beam angle (α angle) on structural parameters as well as peak profile. X-ray diffraction patterns were registered in asymmetrical geometry, in which a parallel beam was formed by Soller and divergence slits. Lowering of the α angle results in accuracy decrease of lattice parameters as well as in significant broadening of a half-width of X-ray diffraction line.

Abstract: In structure studies performed using the Grazing Incident X-ray Diffraction Geometry (GIXD) for different incident angles it was indicated that the Si-N layers are non-homogenous and their structure depends on the penetration depth. The layers close to substrate (α = 2, 1°) show the presence of the Si3N4, SiO2, SiO2, SiC phases and an amorphous Si-N phase as well. The layers near the surface (α = 0.5; 0.25; 0.15°) are poorer in Si-N phases. There are only observed the presence of the Si3N4 and SiO2 phases. The obtained results confirm the non-homogenity of layers.

Abstract: The X-ray reflectivity measurements were used for the analyses of the SiC and SiN thin layers. Density, roughness and the thickness were determined for searching materials. The calculations and simulations were carried out using the WinGixa software. The obtained results show that the studied layers are non-homogenous and there are consist of “sub-layers” rich in Si-C, Si-N, SI-O phases. Moreover, the presence of the main amorphous phase was observed in all searching samples.

Abstract: Phase transitions occurring in the Al2O3-ZrO2 composite as a result of plasma spraying and subsequent coating annealing are described. X-ray diffraction and transmission electron microscopy methods are applied to study these effects. Separate layers of amorphous, nano- and fine-crystalline structure with the columnar crystals areas have been observed. Thermal treatment causes formation of more ordered phases. Effect of partial stabilization of cubic and tetragonal zirconia due to the presence of alumina has been remarked.