"Oxide alkali glass represent one of the most important and extended technical material beeing intensively studied at present in connection with the fixation of radioactive vasts. Exposing a glass by electron beam causes the changes in the glass structure. The atomic bonds break, the point deffects are created and local structure relaxation takes place. Similar changes are found for the irradiated glass by photons or neutrons. Glass irradiated by an electron probe exhibits spontaneous ion migration which begins after some incubation period. Electrical conductivity of the exposed volume increases few orders of magnitude. Structural changes developed in glass can be studied in the scanning electron microscope using X-ray spectroscopy, absorption optical spectroscopy and low angle X-ray diffraction. The aim of this project is to explain the stimulated diffusion of alkali ions and creating the reasonable model for the migration of alkaliions. The research has a great importance for glas"@en . "http://www.isvav.cz/projectDetail.do?rowId=GA104/99/1407"^^ . "2003-04-01+02:00"^^ . . . . "Oxidov\u00E1 alkalick\u00E1 skla p\u0159edstavuj\u00ED jeden z nejd\u016Fle\u017Eit\u011Bj\u0161\u00EDch a nejroz\u0161\u00ED\u0159en\u011Bj\u0161\u00EDch technick\u00FDch materi\u00E1l\u016F, kter\u00FD je v sou\u010Dasnosti intenzivn\u011B studov\u00E1n t\u00E9\u017E v souvislosti s fixac\u00ED radioaktivn\u00EDch odpad\u016F. P\u0159i expozici silik\u00E1tov\u00FDch skel elektronov\u00FDm svazkem doch\u00E1z\u00ED ke zm\u011Bn\u011B jejich struktury, trh\u00E1n\u00ED vazeb mezi jednotliv\u00FDmi atomy, vzniku bodov\u00FDch poruch a lok\u00E1ln\u00ED relaxaci struktury. Podobn\u00E9 zm\u011Bny se ukazuj\u00ED i p\u0159i oz\u00E1\u0159en\u00ED skel fotony nebo neutrony. Alkalick\u00E1 silik\u00E1tov\u00E1 skla oz\u00E1\u0159en\u00E1 svazkem rychl\u00FDch elektron\u016F vykazuj\u00ED migraci alkalick\u00FDch iont\u016F z excitovan\u00E9ho objemu po jist\u00E9 inkuba\u010Dn\u00ED dob\u011B a iontov\u00E1 vodivost v exponovan\u00E9 oblasti vzr\u016Fst\u00E1 o n\u011Bkolik \u0159\u00E1d\u016F. Strukturn\u00ED zm\u011Bny ve sklech m\u016F\u017Eeme studovat pomoc\u00ED rastrovac\u00ED elektronov\u00E9 mikroskopie za pou\u017Eit\u00ED rtg spektrometrie, absorp\u010Dn\u00ED optick\u00E9 spektroskopie a n\u00EDzko\u00FAhlov\u00E9 rtg difrakce. C\u00EDlem projektu je vysv\u011Btlit formov\u00E1n\u00ED elektrick\u00E9ho pole pod povrchem skla a jeho vliv na zm\u011Bnu struktury alkalick\u00FDch skel stimulovanou dif\u00FAz\u00ED alkalick\u00FDch iont\u016F. Vytvo\u0159en\u00ED modelu p" . . . . . . "Neuvedeno."@en . "1"^^ . "1"^^ . "C\u00EDlem projektu bylo prozkoum\u00E1n\u00ED chov\u00E1n\u00ED draseln\u00FDch skel p\u0159i oza\u0159ov\u00E1n\u00ED elektrony. Byla experiment\u00E1ln\u011B ov\u011B\u0159ena matematicky modelov\u00E1na migrace alkalick\u00FDch iont\u016F, byl sledov\u00E1n vliv struktury a slo\u017Een\u00ED skel a byla vypracov\u00E1na experiment\u00E1ln\u00ED metoda pro ur\u010Den\u00ED"@cs . "GA104/99/1407" . . . . . . . . "0"^^ . "Indukovan\u00E1 migrace alkalick\u00FDch iont\u016F v silik\u00E1tov\u00FDch sklech, oz\u00E1\u0159en\u00FDch rychl\u00FDmi elektrony" . . . "17"^^ . "Induced alkali migration in silica glass irradiated by fast electrons"@en . "17"^^ .