National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Detektory rtg a částicového záření na bázi indium fosfidu
Pekárek, Ladislav ; Žďánský, Karel
Indium phospide single crystals were grown by Czochralski method. Various dopants were added to the melt to obtain semi-insulating crystals suitable for detection purposes. Prototype detectors were prepared and evaluated by spectral detection of alpha particles and x-rays.
Růst InP metodou LPE s přídavkem prvků vzácných zemin do taveniny
Grym, Jan ; Procházková, Olga ; Zavadil, Jiří ; Žďánský, Karel
Addition of REs to the growth melt is known to have purifying effect on AIIIBV LPE layers. Each member of REs family acts in its own way. Small addition of Tb, Dy, Tm, and Pr leads to pronounced gettering of shallow donors, the high purity n-type InP can be grown. Exceeding certain concentration, reversal of conductivity type from n to p occurs. Addition of Tm during growth on InP:Fe substrates always results in the preparation of semi-insulating layers due to Fe out-diffusion mediated by RE admixture.
Strukturní závislost fotokatalytických vlastností oxidu wolframového
Domlátil, J. ; Brožek, Vlastimil ; Janča, J. ; Eliáš, M.
By decomposition of ammonia paratungstate in a radiofrequency generated oxygen or argon plasma, a series of specimens with the following stoichiometry were prepared: WO3, WO2.98, WO2.90 and WO2.82. The product structure was characterized by X-ray diffraction, oxygen content by the fussion extraction method (LECO) and TGA. Photocatalytic activity was determined by measuring the color change of spectrophotometric indicators.

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