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Fracture Toughness of Co4Sb12 and In0.1Co4Sb12 Thermoelectric Skutterudites Evaluated by Three Methods

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https://ir.library.oregonstate.edu/concern/articles/3n203z971

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  • Interstitially filled skutterudites are a promising class of state-of-the-art thermoelectric materials. Although thermoelectrics are exposed to significant thermal stresses, little information is known about the fracture toughness of interstitially doped skutterudites. This work explores the fracture toughness of undoped Co₄Sb₁₂ and indium doped In₀.₁Co₄Sb₁₂ skutterudites using three methods: 1) Vickers indentation fracture (VIF), 2) Vickers indent crack opening displacement (COD), and 3) single-edge vee-notched bend (SEVNB) in 4-point flexure. Indium addition to the icosahedral void-sites is verified by an observed increase in the crystal lattice parameter and strongly enhanced thermoelectric properties in the indium-doped samples. Fracture toughness values for Co₄Sb₁₂ and interstitially doped In₀.₁Co₄Sb₁₂ were found to be identical using both the COD and SEVNB methods indicating no interstitial embrittlement occurs due to indium void-site filling. Furthermore, it was found that there is no significant extrinsic toughening by crack bridging or other mechanisms and the toughness was insensitive to grain size variations. Fracture toughness values derived from the Vickers indentation fracture (VIF) method did not agree with the other two methods and it is recommended that that method be avoided. The results indicate that the fracture toughness of skutterudites may be, at least in some cases, significantly lower (~0.5 MPa√m) than previously reported and there may be concern over the durability of skutterudite-based power-producing thermoelectric modules if care is not taken to ensure adequate toughness.
  • Keywords: Thermoelectric Materials, Mechanical Properties, Skutterudites, Fracture Toughness, Interstitially Doped Semiconductors
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  • Eilertsen, J., Subramanian, M., & Kruzic, J. (2013). Fracture toughness of Co₄Sb₁₂ and In₀.₁Co₄Sb₁₂ thermoelectric skutterudites evaluated by three methods. Journal of Alloys and Compounds, 552, 492-498. doi: 10.1016/j.jallcom.2012.11.066
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  • 552
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  • This research was supported by a grant from the National Science Foundation (DMR 0804167).
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