Thermodynamic approaches to determine the vacancy concentration in defective Nb1-CoSb half-Heusler thermoelectric materials

Preparing filled CoSb3 skutterudites at 500 °C by a self-reduction sol–gel route

“…[12][13][14] These methods require high energy consumption and complex equipment for support, which limit the application of CoSb 3. 15,16 Therefore, it is necessary to explore a low cost method to synthesize CoSb 3 skutterudites under mild conditions. [17][18][19][20][21] Tang et al reported a sol-gel method that synthesizes CoSb 3 skutterudites at 773 K, but a pure hydrogen atmosphere is required to reduce Co 2+ and Sb 3+ to Co and Sb.…”

Selective Scatterings of Phonons and Electrons in Defective Half‐Heusler Nb1−δCoSb for the Figure of Merit zT > 1

“…[ 13 ] This wide homogeneity range was later verified by the experimental and calculated phase diagrams. [ 14 ] The understanding of their defect chemistry expands the choice of defective HHs, and 16 previously unreported nominal 19‐electron HHs have been predicted to be stable. [ 12 ] Owing to relatively low κ L but good electrical properties, decent zT s of 0.4–0.7 were realized in the defective V 1− δ CoSb, [ 15 ] Ti 1− δ PtSb, [ 16 ] and Ti 1− δ NiSb, [ 17 ] respectively.…”

Half-Heusler based multicomponent alloys for high temperature thermoelectric applications

“…To reduce the high κ value, heavy elements were added or nanostructuring was performed to aid phonon scattering (Du et al, 2021;Makongo et al, 2011;Yu et al, 2009). Apart from these, vacancy substitution, precipitation of full-Heusler phase, p and n-type doping have been deployed (Douglas et al, 2014;Ferluccio et al, 2019;Huang et al, 2021;Li et al, 2022;Quinn and Bos, 2021). Recently, the high configurational entropy approach has been extended to HH alloys in the form of multiple elements doping at a single FCC site of the HH alloy, termed entropy engineering, or by combining two or more HH alloys to form double or triple HH alloys (Chen et al, 2022;Luo et al, 2022;Ren et al, 2022).…”