Browsing by Author "Danilewsky, A"

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    Electrical, optical and structural properties of lead iodide
    (Springer, 2009-03) Matuchova, M; Zdansky, K; Zavadil, J; Danilewsky, A; Maixner, J; Alexiev, D
    Lead iodide PbI2 is an excellent and interesting candidate for high efficiency room temperature detectors working in the medium energy range of 1 keV-1 MeV. It can be widely applied in medicine, monitoring ecology, nondestructive defectoscopy and X-ray and gamma spectroscopy. The peculiarities of this material are high resistivity, ability to work in a wide range of temperatures and high chemical stability. The method of preparation was direct synthesis from lead and iodine. The material was further purified by zone melting and grown by Bridgman-Stockbarger method. In this work we have concentrated on the study of the influence of dopants such as lanthanides (Er,Gd, Ho, Tb, Tm, Yb, GdI3, HoI3, GdI3) and elements of other groups, such as Au, Ag, Ge on the physical, electrical and optical properties of the PbI2. These were evaluated by resistivity and low temperature photoluminescence measurements. The Synchrotron X-ray topography was successfully introduced to study defects. The quality of the material was analyzed after synthesis, zone melting and growth. The dependence on the concentration of dopants was investigated too. © 2009, Springer.
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    Study of the influence of the rare-earth elements on the properties of lead iodide
    (Elsevier, 2009-07-01) Matuchova, M; Zdansky, K; Zavadil, J; Danilewsky, A; Riesz, F; Hassan, MAS; Alexiev, D; Kral, R
    Lead iodide (PbI2) shows excellent electronic properties for detection of ionizing radiation. We report the introduction of rare-earth elements and other elements as admixtures during synthesis to study their influence on the quality of single crystals. Synthesized material as well as single crystals have been characterized by measurements of electrical resistivity and low-temperature photo luminescence and index of refraction. The structural quality with respect to polytypes was analysed by electron back scatter diffraction. Makyoh topography was applied for surface studies. © 2009, Elsevier Ltd.