Rudolf Heindl

Differences in the optical and photoelectrochemical behaviours of single-crystal and amorphous ferric oxide

Abstract The photoelectrochemical properties of n-type semiconducting ferric oxide (Fe2O3) were investigated using samples prepared by two different techniques: a flux-grown single crystal and a sputtered compound were used as electrodes in a photoelectrochemical cell. The transition mode, the band gap and the flat-band potential were determined by studying the photocurrent and the impedance of the electrode. The results show that the photoelectrochemical behaviours of the two compounds are very different.

Measurement system for alpha emitters in solution

Abstract The measurement of alpha emitter concentrations in solution corresponds to a need felt in particular by laboratories working on actinides and in the spent fuel reprocessing industry. The instrument present here allows this measurement continuously by the use of a new scintillator that is insensitive to corrosive liquids. The extreme thinness of the scintillator guarantees good detection selectivity of alpha particles in the presence of beta and gamma emissions. Examples of uranium-233, plutonium-239 and americium-241 concentration measurements are presented.

Photoelectrochemical behavior of the junction: Cu2O/liquid ammoniate of sodium iodide (NaI·3.3NH3)

Abstract At room temperature, the characteristics of the junction Cu 2 O/liquid ammoniate of sodium iodide (NaI·3.3 NH 3 ) are: • - flat-band potential E fb = +2.28 V vs. Ag/Ag + (5 × 10 −3 M) in situt reference, • - E gap = 2.00 eV. The role of water in the photoreduction of the semiconductor has been carefully investigated.

Photoelectrochemistry of Co3O4 and PbO2 sputtered electrodes

Abstract In this paper, some preliminary results on sputtered electrodes of Co3O4 (p type) and PbO2 (n type) semiconductors are given. Photodissolution was observed in 1 M NaOH. Sodium polysulphide could stabilize both compounds, but hydroquinone could stabilize Co3O4 only.

Rf sputtered Ce3+ activated SiO2 glass films as scintillators for alpha particles detection

Abstract An original fabrication method enables the production of very thin glass scintillators. The main applications concern alpha measurements in the presence of a strong beta and gamma background.