TY - JOUR
T1 - High temperature thermoelectric properties of Yb14-xCaxMnSb11 made by reaction of the elements
AU - Uvarov, Catherine A.
AU - Rauscher, Japheth F.
AU - Kauzlarich, Susan M.
PY - 2011/8
Y1 - 2011/8
N2 - The properties of the isovalent substitution of Ca2+ for Yb2+ will be presented for the Yb14-xCaxMnSb11 solid solution made by a direct reaction of elements (x = 0, 1, 2, 3, 4) with excess Mn (2×). Composition and phase purity was analyzed via powder X-ray diffraction. Electron microprobe analysis showed the presence of Mn inclusions. High temperature thermoelectric property measurements were performed including Seebeck, resistivity, and thermal conductivity (300-1300 K). While all the samples had impurities present, the Seebeck coefficients were enhanced, electrical resistivity was higher and showed a peak at approximately 800 K which may be attributed to Mn inclusions. The total thermal conductivity was lowered compared with Yb14MnSb11, as expected for replacing the heavier Yb2+ with the lighter Ca2+ cation. The maximum zT for the Yb14-xCaxMnSb11 system was observed for x = 2, reaching the value of 1 at 1200 K.
AB - The properties of the isovalent substitution of Ca2+ for Yb2+ will be presented for the Yb14-xCaxMnSb11 solid solution made by a direct reaction of elements (x = 0, 1, 2, 3, 4) with excess Mn (2×). Composition and phase purity was analyzed via powder X-ray diffraction. Electron microprobe analysis showed the presence of Mn inclusions. High temperature thermoelectric property measurements were performed including Seebeck, resistivity, and thermal conductivity (300-1300 K). While all the samples had impurities present, the Seebeck coefficients were enhanced, electrical resistivity was higher and showed a peak at approximately 800 K which may be attributed to Mn inclusions. The total thermal conductivity was lowered compared with Yb14MnSb11, as expected for replacing the heavier Yb2+ with the lighter Ca2+ cation. The maximum zT for the Yb14-xCaxMnSb11 system was observed for x = 2, reaching the value of 1 at 1200 K.
KW - 14-1-11
KW - Antimonide
KW - High zT
KW - Power conversion
KW - YbMnSb
KW - Zintl
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U2 - 10.1166/sam.2011.1195
DO - 10.1166/sam.2011.1195
M3 - Article
AN - SCOPUS:83755178281
VL - 3
SP - 646
EP - 651
JO - Science of Advanced Materials
JF - Science of Advanced Materials
SN - 1947-2935
IS - 4
ER -