Creep Behavior And Post-Creep Thermoelectric Performance Of The N-Type Skutterudite Alloy Yb0.3co4sb12

Upon uniaxial compressive loading at 500 degrees C (T/T-m = 0.67, where T-m is the absolute melting point), the n-type Skutterudite alloy Yb0.3Co4Sb12 deforms plastically by creep via a power-law, with a stress exponent similar to 3 consistent with dislocation viscous glide. An activation energy of 171 kJ/mol is measured over the temperature range of 500-587 degrees C (T/T-m = 0.67-0.75) at a stress of 30 MPa. Yb0.3Co4Sb12 is ductile at 500 degrees 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 degrees C, mostly due to a drop in electrical conductivity. (C) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.