Abstract
The temperature dependence of the electrical resistivity and the thermoelectric power of (Ni1−xMx)Mn2O4 (M=Zn and Mg, x=0, 0.1 and 0.2) are measured. The electric conductivity is described by a small polaron hopping mechanism. The activation energy for electronic conduction is increased above certain temperature. In the low temperature region the absolute value of thermoelectric power is increased by Mg substitution. The thermoelectric powers of all samples are found to change sign from negative to positive with increasing in temperature. This change of sign in the thermoelectric power may take care of the competition between spin-entropy term and hole conduction term caused by the charge transfer from O 2p to transition metal 3d orbitals.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
