Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Improved thermoelectric performance of n-type Mg3Sb2–Mg3Bi2 alloy with Co element doping
Ist Teil von
Current Applied Physics, 2021, 21(1), , pp.25-30
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2021
Link zum Volltext
Quelle
ScienceDirect
Beschreibungen/Notizen
n-type Mg3Sb2–Mg3Bi2 alloy shows as a potential new thermoelectric material (TE) and has been widely researched recently. The pure phase n-type Mg3·20(Sb0·3Bi0.7)1.99Te0.01 were prepared by adjusting Mg content with the Bi impurity phase being effectively suppressed. Then, Co element was doped into the pure phase and the electrical conductivity of samples were improved. With a high power factor of 20.3 μW cm−1K−2 for Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01 at 525 K. Additionally, it was found that the phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg and the lattice thermal conductivity is reduced. As a result, a high ZT value of ~ 1.03 at 525 K is achieved for the Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01.
Co occupies the Mg site, enhancing the phonon scattering to reduce the lattice thermal conductivity thus optimizing the thermoelectric performance. [Display omitted]
•Co was doped into the position of Mg and the electrical conductivity were improves.•With high power factor of 20.3 μWcm−1K−2 for Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01.•Phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg.•High ZT value of 1.03 at 525 K is achieved for Mg3·185Co0·015(Sb0·3Bi0.7)1.99Te0.01.