Based on analysis of AFM-images, presents the results of complex research the mechanisms of nucleation and growth processes, surface topology and thermoelectric properties of vapor-phase condensates PbTe-Bi2Te3, grown on polycrystalline ceramics at constant temperatures evaporation TE = 970 K and deposition TS = 470 K. Deposition time τ = (15-75) s, and the percentage of Bi2Te3 was 1-5 mol.%. The dependence of structural characteristics (average size of nanocrystals, their rate of change in the lateral (Dc, Dc/τ) and normal (hc, hc/τ) directions to the substrate surface) and thermoelectric parameters (electrical conductivity (σ), Hall concentration (n) and mobility media (μ) thermo-EMF (S) and thermoelectric power (S2σ)) condensates PbTe–Bi2Te3 the conditions of their receipt.
The analysis was obtained by atomic force microscopy method of topograms nanostructures on the surface of vapor-phase condensation of SnTe: Bi, thet were opened deposited by evaporation in a vacuum on substrates of ceramics. With the distribution of polar and azimuthal angles of the normal vector to the surface elements of condensate was found objects with flat faces with by dominant orientation in space and by symmetry.
This is a study of atomic force microscope images of crystalline SnTe condensed on a ceramic glass (sitall) substrate. For the first time, two-dimensional forward and reverse Fourier transforms over the intense frequencies are used sequentially to analyze the data. A hidden periodicity in the position of objects on the surface of the film is discovered and confirmed by the two-dimensional autocorrelation function of the image. The one-dimensional Fourier transform is applied to the distribution of the azimuthal angle of the normal vector to the surface. It is found that the condensate surface has an invariant set of symmetry elements, although the dimensions of the surface objects depend monotonically on the deposition time. An approximation is obtained for the distribution of the polar angle of the normal vector using a unique single-mode function whose form is independent of the deposition time.
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