Positron Annihilation Group, Charles University in Prague
DLTP MFF UK
V Holešovičkách 2, 180 00 Praha 8
Tel.: +420 221 912 788, Fax.: +420 221 912 567,Jakub.Cizek@mff.cuni.cz CZ
New:
PLRF 19 code for fitting of positron lifetime - binaries are available for download.Main research topics in our group
- Hydrogen-induced defects, hydrogen trapping at defects
- J. Čížek, I. Procházka, F. Bečvář R. Kužel, M. Cieslar, G. Brauer, W. Anwand, R. Kirchheim, A. Pundt: "Hydrogen-induced defects in bulk niobium", Phys. Rev. B 69, 224106 (2004)
- J.Čížek, I. Procházka, S. Daniš, M. Cieslar, G. Brauer, W. Anwand, R. Kirchheim, A. Pundt, "Hydrogen-induced defects in niobium", Journal of Alloys and Compounds 446-447, 479 (2007)
- Hydrogen in thin films
- J. Čížek, I. Procházka, G. Brauer, W. Anwand, A. Mücklich, R. Kirchheim, A. Pundt, C. Bähtz, M. Knapp: "Defect studies of hydrogen-loaded thin Nb films", Applied Surface Science 252, 3237 (2006)
- J. Čížek, I. Procházka, S. Daniš, O. Melikhová, M. Vlach, N. Žaludová, G. Brauer, W. Anwand, A. Mücklich, R. Gemma, E. Nikitin, R. Kirchheim, A. Pundt: "Positron annihilation study of hydrogen trapping at grain boudaries and dislocations in nanocrystalline and epitaxial Nb thin films", Journal of Alloys and Compounds 446-447,484 (2007)
- Defects in zinc oxide
- G. Brauer, J. Kuriplach, J. Čížek, W. Anwand, O. Melikhova, I. Procházka, W. Skorupa: "Positron lifetimes in ZnO single crystals:, Vacuum 81, 1314 (2007)
- G. Brauer, W. Anwand, W. Skorupa, J. Kuriplach, O. Melikhova, J. Čížek, I. Procházka, H. von Wenckstern, M. Brandt, M. Lorenz, M. Grundmann: "Defects in N+ ion-implanted ZnO single crystals studied by positron annihilation and Hall effect", physica status solidi c 4, 3642 (2007)
- Microstructure and thermal stability of ultra fine grained materials prepared by severe plastic deformation
- J. Čížek, I. Procházka, M. Cieslar, R. Kužel, J. Kuriplach, F. Chmelík, I. Stulíková, F. Bečvář, O. Melikhova, R.K. Islamgaliev: "Thermal stability of ultrafine grained copper", Phys. Rev. B 65, 094106 (2002).
- J. Čížek, I. Procházka, M. Cieslar, I. Stulíková, F. Chmelík, R.K. Islamgaliev: "Positron-lifetime investigation of thermal stability of ultra-fine grained nickel" physica status solidi (a) 191, 391-408 (2002).
- Phase transitions and precipitation effects in Mg alloys
- J. Čížek, I. Procházka, B. Smola, I. Stulíková, V. Očenášek: "Influence of deformation on precipitation process in Mg-15wt.%Gd alloy", Journal of Alloys and Compounds 430, 92-96 (2007).
- J.Čížek, I. Procházka, B. Smola, I. Stulíková, R. Kužel, Z. Matěj, V. Cherkaska, R.K. Islamgaliev, O. Kulyasova: "Microstructure and thermal stability of ultra fine grained Mg-based alloys prepared by high pressure torsion", Mater. Sci. Eng. A 462, 121 (2007)
- Radiation damage in reactor pressure vessel steels
- J.Kočík, E. Keilová, J. Čížek, I. Procházka: "TEM and PAS study of irradiated reactor pressure vessel steels" Journal of Nuclear Materials 303, 52 (2002)
- J. Čížek, F. Bečvář, I. Procházka: "Three-Detector Setup for positron-lifetime spectroscopy of solids containing 60Co radionuclide", Nuclear Instruments and Methods in Physics A 450, 325-338 (2000).
- Investigation of defect in zirconia based materials
- J. Čížek, O. Melikhova, J. Kuriplach, I. Procházka, T.E. Konstantinova, I.A. Danilenko: "Defects in yttria-stabilised zirconia: a positron lifetime study", physica status solidi c 4, 3847 (2007)
- O. Melikhova, J. Kuriplach, J. Čížek, I. Procházka, W. Anwand, G. Brauer, T.E. Konstantinova, I.A. Danilenko: "Positron annihilation in three zirconia polymorphs", physica status solidi c 4, 3831 (2007)
- Characterization of free volumes in polymers
- I. Procházka, J. Čížek, V. Motyčka: "Positronium yields in amorphous, cross-linked and conductive polystyrene", Radiat.Phys. Chem. 76, 180 (2007)
- J. Čížek, V. Motyčka, I. Procházka, M. Ilavský, J. Kolařík: "Positron lifetime study of polycarbonate/polystyrene-acrylonitride blends", Materials Science Forum 363-365, 340 (2001)
- Development of high resolution positron lifetime spectroscopy
- F. Bečvář, J. Čížek, I. Procházka, "High-resolution positron lifetime measurement using ultra fast digitizers Acqiris DC211", Applied Surface Science 255, 111-114 (2008).
- F. Bečvář, J. Čížek, I. Procházka, "Performance of a High-Resolution Digital Positron-Lifetime Spectrometer", Acta Physica Polonica A 113, 1279-1284 (2008).
- F. Bečvář, "Methodology of positron lifetime spectroscopy: present status and perspectives", Nucl. Instr. Meth. B 261, 871-874 (2007).
- F. Bečvář, J. Čížek, I. Procházka, J. Janotová: "The asset of ultra-fast digitizers for positron-lifetime spectroscopy", Nucl.Instr. Meth. A 539, 372 (2005)