Strength of N‐ and P‐Type Skutterudites ¹

Thermal Stability of P-Type BiSbTe Alloys Prepared by Melt Spinning and Rapid Sintering

“…Considering that the MS10 and ZM samples exhibited excellent thermal stability when annealing at 473 K for one week, their mechanical responses (including flexural strength and compressive strength) were measured (at room temperature, 373 K, and 473 K) and compared to those of the unannealed samples. The two-parameter Weibull distribution was employed to calculate the characteristic strength and Weibull modulus; this fitted the discrete data better than the Gaussian distribution, especially for brittle materials [ 49 ]; it has been widely adopted for analyzing the mechanical properties of a series of TE materials, such as LAST-T (Ag 0.9 Pb 9 Sn 9 Sb 0.6 Te 20 ) [ 53 ], skutterudites [ 54 , 55 ], and Bi 2 Te 3 -based alloys [ 20 , 21 , 43 ]. The original data fitted by the Weibull and Gaussion distributions are listed in Tables S3 and S4 .…”

Mechanical Response of Thermoelectric Materials

“…Effective sizes for simple mechanical test coupons can be determined analytically [7]. Results from examples of these calculations are listed in Table 1 for a three-point bend configuration used to test skutterudite TEMats [12]. Weibull modulus (m) = 5 were used in the calculations.…”

“…There is a substantial amount of information on uniaxial flexure testing of TEMats in the literature [1,12,15,17,28,32,[36][37][38][39][40][41][42], and a listing of uniaxial flexure strength values for bismuth tellurides, Ca 3 CoO 4 , half-Heuslers, PbTe, skutterudites, and Zn 4 Sb 3 is provided in Appendix B, along with information on the test method used for the measurements.…”

“…Size-scaling theory is considered in two studies involving skutterudites [1,12], which include a comparison of their strengths. Electrical discharge machined prismatic bars of 1.5 × 2.0 × 28 mm of n-type CoSb 3 and p-type CeFe 3-x Ru x Sb 3 were flexure strength tested in Ref.…”

“…To enable a comparison to Ref. [12], Ravi et al's [1] results produce associated k L L = 23.3 mm, k A A = 26.3 mm 2 , and k V V = 2.9 mm 3 (see Ref. [7] for k A A and k V V calculations for four-point bending).…”