Enhanced high-temperature thermoelectric performance of Yb 14-xCa xMnSb 11

Catherine A. Uvarov, Francisco Ortega-Alvarez, Susan M. Kauzlarich

Research output: Contribution to journalArticle

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Abstract

The high temperature p-type thermoelectric material Yb 14MnSb 11 has been of increasing research interest since its high temperature thermoelectric properties were first measured in 2006. Subsequent substitutions of Zn, Al, and La into the structure have shown that this material can be further optimized by altering the carrier concentration or by reduction of spin-disorder scattering. Here the properties of the Yb 14-xCa xMnSb 11 solid solution series where isovalent Ca 2+ is substituted for Yb 2+ will be presented. Crystals of the Yb 14-xCa xMnSb 11 solid solution series were made by Sn-flux (x = 2, 4, 6, 8) with the following ratio of elements: (14-x)Yb: xCa: 6 Mn: 11Sb: 86Sn, and their structures determined by single crystal X-ray diffraction. The density of the material significantly decreases by over 2 g/cm 3 as more Ca is added (from x = 1 to 8), because of the lighter mass of Ca. The resulting lower density is beneficial from a device manufacturing perspective where there is often a trade-off with the specific power per kilogram. The compounds crystallize in the Ca 14AlSb 11 structure type. The Ca substitution contributes to systematic lengthening the Mn-Sb bond while shortening the Sb-Sb bond in the 3 atom linear unit with increasing amounts of Ca. Temperature dependent thermoelectric properties, Seebeck, electrical resistivity, and thermal conductivity were measured from room temperature to 1273 K. Substitution of Yb with Ca improves the Seebeck coefficient while decreasing the thermal conductivity, along with decreasing the carrier concentration in this p-type material resulting in an enhanced thermoelectric figure of merit, zT, compared to Yb 14MnSb 11.

Original languageEnglish (US)
Pages (from-to)7617-7624
Number of pages8
JournalInorganic Chemistry
Volume51
Issue number14
DOIs
StatePublished - Jul 16 2012

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substitutes
Substitution reactions
solid solutions
thermal conductivity
Carrier concentration
Solid solutions
Thermal conductivity
thermoelectric materials
Seebeck effect
figure of merit
Temperature
Seebeck coefficient
manufacturing
disorders
electrical resistivity
single crystals
Single crystals
room temperature
Scattering
Fluxes

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Enhanced high-temperature thermoelectric performance of Yb 14-xCa xMnSb 11 . / Uvarov, Catherine A.; Ortega-Alvarez, Francisco; Kauzlarich, Susan M.

In: Inorganic Chemistry, Vol. 51, No. 14, 16.07.2012, p. 7617-7624.

Research output: Contribution to journalArticle

Uvarov, CA, Ortega-Alvarez, F & Kauzlarich, SM 2012, 'Enhanced high-temperature thermoelectric performance of Yb 14-xCa xMnSb 11 ', Inorganic Chemistry, vol. 51, no. 14, pp. 7617-7624. https://doi.org/10.1021/ic300567c
Uvarov, Catherine A. ; Ortega-Alvarez, Francisco ; Kauzlarich, Susan M. / Enhanced high-temperature thermoelectric performance of Yb 14-xCa xMnSb 11 In: Inorganic Chemistry. 2012 ; Vol. 51, No. 14. pp. 7617-7624.
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