National Repository of Grey Literature 4 records found  Search took 0.02 seconds. 
Srovnávací studie heterostruktur s kvantovými jámami pomocí tranzientní spektroskopie hlubokých hladin
Kosíková, Jitka ; Žďánský, Karel ; Rudra, A. ; Kapon, E.
Deep level transient spectroscopy (DLTS) and capacitance-voltage measurements have been made on AlGaAs/GaAs diode structures containing quantum wells (QW) prepared with graded and with step aluminium content as well as on structures without QWs.A new DLTS peak has been observed in the structures containing QWs, either with graded or with step structure. Mechanisms of electron transitions explaining the new results has been discussed.
Nanodifúze 3. Neobvyklá difúze v hrubozrném Si
Rothová, Věra
A new interpretation of literature data concerning diffusion of gold into coarse-grained silicon is presented.
Nanodifúze 2. Neobvyklá difúze v hrubozrném Mg-2Al
Rothová, Věra ; Buršík, Jiří
After implantation of the 71Ge radiotracer in the coarse-grained binary magnesium alloy Mg-1.8 wt.% Al, tracer diffusion coefficients were measured using both the serial sectioning and the residual activity technique in temperature region 448–848 K.
Objemový nanokrystalický keramický materiál připravený plazmovým stříkáním
Chráska, Tomáš ; Neufuss, Karel ; Rohan, Pavel ; Dubský, Jiří
Ceramic material based on alumina-zirconia mixture have been successfully plasma sprayed by water stabilized plasma torch (WSP®). The material is composed of three main compounds Al2O3, ZrO2, and SiO2 where the ratio of Al2O3 – ZrO2 compounds is close to the ratio in their respective eutectic alloy. The material is a refractory and exhibits very high hardness, abrasion resistance, and chemical resistance. Cast tiles of the original material were ground and sieved to obtain the right powder cut size for plasma spraying by WSP®. Both thick coatings and free standing parts with very low open porosity were easily achieved by WSP®. The feedstock powder is mostly crystalline whereas the as?sprayed material is mostly amorphous with some unmelted crystalline particles present. Electron microscopy and X-ray diffraction were employed to determine microstructure, crystallinity, and phase content of the bulk samples as well as individual splats.

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