High thermoelectric performance of p-type half-Heusler (Hf,Ti)Co(Sb,Sn) solid solutions fabricated by mechanical alloying

Advances in half-Heusler alloys for thermoelectric power generation

“…92 The above reports generally make use of arc-melting to react elemental pieces, although a 2021 report eliminated the melting step, simply ball-milling elemental precursors and hot-pressing at 1000 °C. 140 This study equalled the record with zT 975 K = 1.1 for this family with the composition Ti 0.4 Hf 0.6 CoSb 0.83 Sn 0.17 , with suppressed κ l and S 2 σ. 140 While this is a positive result, it also illustrates that κ l can't be suppressed further using Ti without also suppressing the electronic performance.…”

“…140 This study equalled the record with zT 975 K = 1.1 for this family with the composition Ti 0.4 Hf 0.6 CoSb 0.83 Sn 0.17 , with suppressed κ l and S 2 σ. 140 While this is a positive result, it also illustrates that κ l can't be suppressed further using Ti without also suppressing the electronic performance.…”

Thermoelectric properties of half-Heusler alloys

“…Taking PF max as a precondition, a "golden range" for S is represented in Figure 4. [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68] This is mainly because the higher m * d (greater DOS) usually translates into greater scattering of moving charge carriers, resulting in lower μ, σ, and PF max . Owing to the coupling between S and σ, the "golden range" of S for P-and N-type HHs is generally 175-225 μV K -1 in Figure 4, which plays a key directive role in the regulation of S. Moreover, Hong et al 66 conducted a systematic simulation analysis from the perspective of optimizing E F and showed that the optimized S corresponding to PF max is in the range of 203-230 μV K -1 , and the golden rule of S is verified in an N-type Pb 1−x Bi x Se system.…”

Synthesis of Uniformly Sized Bi0.5Sb1.5Te3.0 Nanoparticles via Mechanochemical Process and Wet-Milling for Reduced Thermal Conductivity

“…Recent efforts have focused on introducing nanostructures, such as nanoparticles (NPs), nanowires (NWs), nanoporous media, and nanocomposites, which are easily capable of forming numerous grain boundaries, into bulk TE materials [12][13][14][15][16][17]. Among a variety of routes for introducing nanostructures into bulk TE materials, the mechanochemical process (MCP) is an effective approach to obtain alloy NPs from elemental precursors by self-ignition and propagation reaction during high-energy ball milling under dry conditions [18][19][20][21][22][23]. Thus, this method is advantageous for designing TE materials because of the facile fabrication process that facilitates large-scale TE NP production, wherein the NPs serve to provide smaller grain sizes and larger grain boundaries for lower κ l values.…”