caa a22 4500 463227468 CHVBK 20180405153231.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-1349-0 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1349-0 The effect of Ti4+ ions and gamma radiation on the structure and electrical properties of Mg ferrite [Elektronische Daten] [M. Ahmed, E. Ateia, F. Salem] Ferrite samples of the general formula Mg1+x Ti x Er y Fe2−2x−y O4; 0.1 ≤ x ≤ 0.9, y=0.025 were prepared using the standard ceramic method. The final sintering temperature was 1,200°C with heating rate 4°C/min during 100h. X-ray diffraction analysis was carried out to assure the formation of the spinel structure. The effect of Ti4+ ion concentration on the structural and the electrical properties of the investigated samples is studied. It change the iron ion concentration from 2 to 2−2x thereby decreasing the number of ferrous ions on octahedral sites, with a consequent decrease the dielectric constant. The most important result of γ-irradiation on the electrical properties is the change of ratio $${{\hbox {{Fe}}^{2+}}\left/{{\hbox {Fe}}^{3+}}\right.}$$ on the octahedral site leading to increase the conductivity as well as the dielectric constant. The variation of the thermoelectric power with a temperature is performed, the common feature of all compositions is the fluctuation of Seebeck coefficient between positive and negative over the whole range of temperature. This indicates that the charge carriers are electrons and holes, depending on both the temperature range and the additive in the ferrite samples. Springer Science+Business Media, LLC, 2007 Ahmed M. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut Ateia E. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut Salem F. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3651-3660 0022-2461 42:10<3651 2007 42 10853 https://doi.org/10.1007/s10853-006-1349-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1349-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ahmed M. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Ateia E. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Salem F. Physics Department, Faculty of Science, Cairo University, Giza, Egypt aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3651-3660 0022-2461 42:10<3651 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer