caa a22 4500 46322115X CHVBK 20180405153212.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10853-006-1087-3 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1087-3 Study of the dc resistivity and thermoelectric power in Mn-substituted Ni-Zn ferrites [Elektronische Daten] [A. Sattar, H. El-Sayed, K. El-Shokrofy, M. El-Tabey] The electrical resistivity and thermoelectric power as a function of temperature and Mn concentration for Ni0.6-t Mn t Zn0.4Fe2O4 (t=0, 0.1, 0.2, 0.3, 0.4 and 0.5) have been studied. It was observed that temperature variation of resistivity exhibits two breaks. Each break is associated with a change in activation energy. The activation energy in the paramagnetic region is found to be greater than that in the ferrimagnetic one. Moreover, it was found that the resistivity increases with increasing Mn content. The sign of thermoelectric power measurements revealed n-type conduction for all investigated samples. The results are explained according to the spin polaron model. Springer Science+Business Media, LLC, 2006 Sattar A. Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt aut El-Sayed H. Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt aut El-Shokrofy K. Basic Engineering Science Department, Faculty of Engineering, Minufia University, Shebin El-Kom, Egypt aut El-Tabey M. Basic Engineering Science Department, Faculty of Engineering, Minufia University, Shebin El-Kom, Egypt aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/1(2007-01-01), 149-155 0022-2461 42:1<149 2007 42 10853 https://doi.org/10.1007/s10853-006-1087-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1087-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sattar A. Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt aut NATIONALLICENCE 700 1- El-Sayed H. Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt aut NATIONALLICENCE 700 1- El-Shokrofy K. Basic Engineering Science Department, Faculty of Engineering, Minufia University, Shebin El-Kom, Egypt aut NATIONALLICENCE 700 1- El-Tabey M. Basic Engineering Science Department, Faculty of Engineering, Minufia University, Shebin El-Kom, Egypt aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/1(2007-01-01), 149-155 0022-2461 42:1<149 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer