6 research outputs found
Characterization of electron and phonon transports in Bi-doped CaMnO3 for thermoelectric applications
Electron and phonon transports in CaMnO3 and its Bi-doped counterpart,
Bi0.03Ca0.97MnO3, are investigated by thermoelectric transport measurements,
Raman spectroscopy, and first-principles calculations. In particular, we focus
on CaMnO3 and Bi0.03Ca0.97MnO3's electronic structures, temperature-dependent
electron and phonon lifetimes, and their sound velocities. We find that the
anti-ferromagnetic insulator CaMnO3 breaks the Wiedemann-Franz (WF) law with
the Lorenz number reaching four times that of ordinary metals at room
temperature. Bismuth doping reduces both the electrical resistivity and the
Seebeck coefficient of CaMnO3, thus it recovers the WF law behavior. Raman
spectroscopy confirms that Bi0.03Ca0.97MnO3 has a lower Debye frequency as well
as a shorter phonon lifetime. As a result, Bi0.03Ca0.97MnO3 exhibits superior
thermoelectric properties over the pristine CaMnO3 due to the lower thermal
conductivity and electronic resistivity.Comment: 7 pages, 7 figure
Investigation of electron and phonon transport in Bi-doped CaMnO3 for thermoelectric applications
The electron and phonon transports in CaMnO3 and in one of its Bi-doped counterparts, namely,
Bi0.03Ca0.97MnO3, are investigated using the thermoelectric transport measurements and first-principles calculations. We find that antiferromagnetic insulator CaMnO3 breaks the Wiedemann–Franz law with the Lorenz number reaching four times that of ordinary metals at room temperature. Bismuth doping reduces both the electrical resistivity and Seebeck coefficient of CaMnO3; thus, it recovers the Wiedemann–Franz law behavior. In addition, Bi0.03Ca0.97MnO3 possesses a shorter phonon lifetime according to the transport measurements. As a result, Bi0.03Ca0.97MnO3 exhibits superior thermoelectric properties over pristine CaMnO3 owing to the lower thermal conductivity and electrical resistivity