TY - JOUR
T1 - The effect of tm substitution on the thermoelectric performance of Yb14MnSb11
AU - Uvarov, Catherine A.
AU - Abdusalyamova, M. N.
AU - Makhmudov, F.
AU - Star, Kurt
AU - Fleurial, Jean Pierre
AU - Kauzlarich, Susan M.
PY - 2011/8
Y1 - 2011/8
N2 - The Zintl phase, Yb14MnSb11, has been recently identified as a potential thermoelectric material because of its high figure of merit (zT) above 1000 K. Tuning the carrier concentration with La3+ provided an improved zT at high temperatures. Rare earth elements provide additional tuning through size, electron donor properties, and effects on bonding. The solubility of the rare earth, Tm, was explored to provide chemical pressure and enhance the Seebeck coefficient of Yb14MnSb11. Crystals were prepared via Sn flux synthesis with the compositional fluxes of Yb14-xTmxMnSb11 (x = 0.3 (1), 0.5 (2), 0.7 (3)). The incorporation of Tm does not significantly alter the unit cell parameters of Yb14MnSb11. The content of Tm was probed with wavelength dispersive microprobe analysis and showed that the maximum amount of Tm is 0.44 with the composition being Yb13.34(6)Tm0.44(1)Mn1.04(2)Sb11.19(6). Single crystal compositions of Yb14-xTmxMnSb11 (x = 0.29 (1), 0.40 (2), and 0.44 (3)) were measured. Samples were hot pressed and thermoelectric properties measured from 300-1200 K. The hot pressed pellets showed very similar Tm composition of approximately x = 0.4. All the samples show enhanced Seebeck coefficients and slightly higher electrical resistivity as compared with Yb14MnSb11, as expected for the addition of Tm3+ in this p-type compound. Total thermal conductivity is approximately the same as Yb14MnSb11 leading to a maximum zT of 0.81 at 1195 K for sample 2 with nominal composition Yb13.35(4)Tm0.44(1)Mn1.027(6)Sb11.18(4).
AB - The Zintl phase, Yb14MnSb11, has been recently identified as a potential thermoelectric material because of its high figure of merit (zT) above 1000 K. Tuning the carrier concentration with La3+ provided an improved zT at high temperatures. Rare earth elements provide additional tuning through size, electron donor properties, and effects on bonding. The solubility of the rare earth, Tm, was explored to provide chemical pressure and enhance the Seebeck coefficient of Yb14MnSb11. Crystals were prepared via Sn flux synthesis with the compositional fluxes of Yb14-xTmxMnSb11 (x = 0.3 (1), 0.5 (2), 0.7 (3)). The incorporation of Tm does not significantly alter the unit cell parameters of Yb14MnSb11. The content of Tm was probed with wavelength dispersive microprobe analysis and showed that the maximum amount of Tm is 0.44 with the composition being Yb13.34(6)Tm0.44(1)Mn1.04(2)Sb11.19(6). Single crystal compositions of Yb14-xTmxMnSb11 (x = 0.29 (1), 0.40 (2), and 0.44 (3)) were measured. Samples were hot pressed and thermoelectric properties measured from 300-1200 K. The hot pressed pellets showed very similar Tm composition of approximately x = 0.4. All the samples show enhanced Seebeck coefficients and slightly higher electrical resistivity as compared with Yb14MnSb11, as expected for the addition of Tm3+ in this p-type compound. Total thermal conductivity is approximately the same as Yb14MnSb11 leading to a maximum zT of 0.81 at 1195 K for sample 2 with nominal composition Yb13.35(4)Tm0.44(1)Mn1.027(6)Sb11.18(4).
KW - 14-1-11
KW - Antimonide
KW - High temperature thermoelectric
KW - High zt
KW - Power generation
KW - Zintl
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U2 - 10.1166/sam.2011.1196
DO - 10.1166/sam.2011.1196
M3 - Article
AN - SCOPUS:83755195475
VL - 3
SP - 652
EP - 658
JO - Science of Advanced Materials
JF - Science of Advanced Materials
SN - 1947-2935
IS - 4
ER -