http://dspace.nbuv.gov.ua:80/handle/123456789/114584 Sun, 05 Apr 2026 23:49:19 GMT 2026-04-05T23:49:19Z http://dspace.nbuv.gov.ua:80/bitstream/id/341195/ http://dspace.nbuv.gov.ua:80/handle/123456789/114584 http://dspace.nbuv.gov.ua:80/handle/123456789/119060 Thermoelectric studies of electronic properties of ferromagnetic GaMnAs layers Osinniy, V.; Dybko, K.; Jedrzejczak, A.; Arciszewska, M.; Dobrowolski, W.; Story, T.; Radchenko, M.V.; Sichkovskiy, V.I.; Lashkarev, G.V.; Olsthoorn, S.M.; Sadowski, J. Thermoelectric power, electrical conductivity, and high field Hall effect were studied over a broad temperature range in ferromagnetic Ga₁₋xMnxAs epitaxial layers (0.015 ≤ x ≤ 0.06). Thermoelectric power analysis gives information about carrier transport mechanisms in layers with both metallic and non-metallic types of conductivity and allows determination of the Fermi energy and carrier concentration. At high temperatures (T > 70 K), the thermoelectric power in GaMnAs linearly increases with increasing temperature. That indicates the presence of a degenerate hole gas with the Fermi energy EF = 220 ± 25 meV, nearly independent of Mn content (for 0.02 ≤ x ≤ 0.05). At lower temperatures, GaMnAs layers with metallic-type conductivity show an additional contribution to the thermoelectric power with the maximum close to the Curie temperature. Tue, 01 Jan 2008 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119060 2008-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119059 Investigations of surface morphology and chemical composition of Ag/ZnS/glassceramic thin-film structure Kurbatov, D.; Opanasyuk, A.; Denisenko, V.; Kramchenkov, A.; Zaharets, M. The surface morphology and chemical composition of Ag/ZnS/glassceramic thin-film system obtained by close-spaced vacuum sublimation technique under different grow conditions were investigated. Examination of surface profile and morphology was performed by scanning electron and optical microscopy. Chemical composition was studied by Rutherford back scattering method. Results of morphology studies enabled to determine dependence of the growth mechanism, roughness Ra, grain size D of ZnS layers on the growth conditions. The researches of chemical composition allowed to determine the concentration of compound elements and impurities, deviation from stoichiometry and thickness distribution of chemical elements. Tue, 01 Jan 2008 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119059 2008-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119058 Development of a KDP crystal growth system based on TRM and characterization of the grown crystals Javidi, S.; Faripour, H.; Esmaeil Nia, M.; Sepehri, K.F.; Ali Akbari, N. A solution growth system has been built based on temperature reduction method [1]. A few KDP crystals were grown by the system up to 160×40×38 mm dimensions. Spectrophotometer transmission spectra from (100) planes of the grown crystals show about 86 % transmission in the visible region. XRD analysis, laser damage threshold, and microhardness of the crystals were determined. The etching behavior of surface features of grown KDP single crystals was studied in different etchants. Tue, 01 Jan 2008 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119058 2008-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119057 Optical-electronic sensor of spacecraft heat protection ablation Hornostaev, G. Block diagram and results of tests on gas-dynamic stands are represented to illustrate operation of the continuous ablation sensor, in which color light guides with a diameter of 1 mm are used. It is shown that the application of compensating light filter in the colorless channel makes it possible to create the meter invariant to external radiant fluxes applied to the heat protection covering surface. Tue, 01 Jan 2008 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/119057 2008-01-01T00:00:00Z