TY - JOUR
T1 - Thermoelectric properties of Mn-doped Ca 5Al 2Sb 6
AU - Zevalkink, Alex
AU - Swallow, Jessica
AU - Snyder, G. Jeffrey
N1 - Funding Information:
We gratefully acknowledge the Jet Propulsion Laboratory and National Science Foundation for support, as well as the generous support of Marcella Bonsall for Caltech’s Summer Undergraduate Research Program.
PY - 2012/5
Y1 - 2012/5
N2 - Ca 5Al 2Sb 6 is a relatively inexpensive Zintl compound exhibiting promising thermoelectric efficiency at temperatures suitable for waste heat recovery. Motivated by our previous studies of Ca 5Al 2Sb 6 doped with Na and Zn, this study focuses on doping with Mn 2+ at the Al 3+ site. While Mn is a successful p-type dopant in Ca 5Al 2Sb 6, we find that incomplete dopant activation yields lower hole concentrations than obtained with either previously investigated dopant. High-temperature Hall effect and Seebeck coefficient measurements show a transition from nondegenerate to degenerate semiconducting behavior in Ca 5Al 2-xMn xSb 6 samples (x = 0.05, 0.1, 0.2, 0.3, 0.4) with increasing Mn content. Ultimately, no improvement in zT is achieved via Mn doping, due in part to the limited carrier concentration range achieved.
AB - Ca 5Al 2Sb 6 is a relatively inexpensive Zintl compound exhibiting promising thermoelectric efficiency at temperatures suitable for waste heat recovery. Motivated by our previous studies of Ca 5Al 2Sb 6 doped with Na and Zn, this study focuses on doping with Mn 2+ at the Al 3+ site. While Mn is a successful p-type dopant in Ca 5Al 2Sb 6, we find that incomplete dopant activation yields lower hole concentrations than obtained with either previously investigated dopant. High-temperature Hall effect and Seebeck coefficient measurements show a transition from nondegenerate to degenerate semiconducting behavior in Ca 5Al 2-xMn xSb 6 samples (x = 0.05, 0.1, 0.2, 0.3, 0.4) with increasing Mn content. Ultimately, no improvement in zT is achieved via Mn doping, due in part to the limited carrier concentration range achieved.
KW - Electronic transport
KW - Lattice thermal conductivity
KW - Thermoelectric material
KW - Zintl compound
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U2 - 10.1007/s11664-012-1951-7
DO - 10.1007/s11664-012-1951-7
M3 - Article
AN - SCOPUS:84862125870
SN - 0361-5235
VL - 41
SP - 813
EP - 818
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
IS - 5
ER -