Reference : Characterization of electron and phonon transports in Bi-doped CaMnO3 for thermoelect...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Characterization of electron and phonon transports in Bi-doped CaMnO3 for thermoelectric applications
Suprayoga, E []
Putri, WBK []
Singsoog, K []
Paengson, S []
Hanna, MY []
Nugraha, ART []
Munazat, DR []
Kurniawan, B []
Seetawan, T []
Hasdeo, Eddwi Hesky mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
[en] Thermoelectrics ; Characterization ; CaMnO3
[en] 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.

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