@article{c7b55343c81f4e93902a6b64c7a32aee,
title = "Creep behavior and post-creep thermoelectric performance of the n-type Skutterudite alloy Yb0.3Co4Sb12",
abstract = "Upon uniaxial compressive loading at 500 °C (T/Tm = 0.67, where Tm is the absolute melting point), the n-type Skutterudite alloy Yb0.3Co4Sb12 deforms plastically by creep via a power-law, with a stress exponent ∼3 consistent with dislocation viscous glide. An activation energy of 171 kJ/mol is measured over the temperature range of 500–587 °C (T/Tm = 0.67–0.75) at a stress of 30 MPa. Yb0.3Co4Sb12 is ductile at 500 °C, exhibiting a compressive strain of 25% when subjected to stresses ranging from 22 to 90 MPa for up to 28 days. Among the thermoelectric materials tested so far for creep, Yb0.3Co4Sb12 exhibits a creep resistance intermediate between low-melting (Bi2Te3, TAGS-85) and high-melting thermoelectrics (Mg2Si and ZrNiSn). A relatively modest drop in the figure of merit zT, from 0.67 to 0.52, is displayed by Yb0.3Co4Sb12 after accumulating 3.7% compressive creep strain at 500 °C, mostly due to a drop in electrical conductivity.",
keywords = "CoSb, Creep, Electrical conductivity, Filled Skutterudite, Seebeck coefficient",
author = "{Al Malki}, {Muath M.} and Xun Shi and Pengfei Qiu and Snyder, {G. Jeffrey} and Dunand, {David C.}",
note = "Funding Information: This research was supported by the NASA Science Missions Directorate{\textquoteright}s Radioisotope Power Systems Technology Advancement Program. This work made use of the MatCI Facility which receives support from the MRSEC Program (NSF DMR- 1720139 ) of the Materials Research Center at Northwestern University . This work made use, as well, of the EPIC facility of Northwestern University{\textquoteright}s NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS- 1542205 ); the MRSEC program (NSF DMR- 1720139 ) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. This work also made use of the IMSERC at Northwestern University , which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS- 1542205 ); the State of Illinois and International Institute for Nanotechnology (IIN). GJS Acknowledges support from the NASA Science Mission Directorate{\textquoteright}s Radioisotope Power Systems Thermoelectric Technology Development program. Publisher Copyright: {\textcopyright} 2020 The Chinese Ceramic Society",
year = "2021",
month = jan,
doi = "10.1016/j.jmat.2020.07.012",
language = "English (US)",
volume = "7",
pages = "89--97",
journal = "Journal of Materiomics",
issn = "2352-8478",
publisher = "Chinese Ceramic Society",
number = "1",
}