caa a22 4500 463214498 CHVBK 20180405153152.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s00339-006-3802-y doi (NATIONALLICENCE)springer-10.1007/s00339-006-3802-y Khalil M.M.I. Radiation Physics Department, National Center for Radiation Research & Technology, Nasr City, Cairo, Egypt aut Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide [Elektronische Daten] [M.M.I. Khalil] The effect of electric field strength on conduction in lithium borate glasses doped with CuO with different concentration was studied and the value of the jump distance of charge carrier was calculated. The conductivity measurements indicate that the conduction is due to non-adiabatic hopping of polarons and the activation energies are found to be temperature and concentration dependent. Lithium borate glasses are subjected to carefully-programmed thermal treatments which cause the nucleation and growth of crystalline phases. X-ray diffraction analysis confirmed the amorphous nature for the investigated glass sample and the formation of crystalline phase for annealed samples at 650°C. The main separated crystalline phase is Li2B8O13. The scanning electron micrographs of some selected glasses showed a significant change in the morphology of the films investigated due to heat treatment of the glass samples. It was found that the dc-conductivity decreases with an increase of the HT temperature. The decrease of dc conductivity, with an increase of the HT temperature, can be related to the decrease in the number of free ions in the glass matrix. There is deviation from linearity at high temperature regions in the logσ-1/T plots for all investigated doped samples at a certain temperature at which the transition from polaronic to ionic conduction occurs. The hopping of small polarons is dominant at low temperatures, whereas the hopping of Li+ ions dominates at high temperatures. Springer-Verlag, 2007 Applied Physics A Springer-Verlag 86/4(2007-03-01), 505-514 0947-8396 86:4<505 2007 86 339 https://doi.org/10.1007/s00339-006-3802-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-006-3802-y text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Khalil M.M.I. Radiation Physics Department, National Center for Radiation Research & Technology, Nasr City, Cairo, Egypt aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 86/4(2007-03-01), 505-514 0947-8396 86:4<505 2007 86 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer