Alloyed triple half-Heuslers: a route toward high-performance thermoelectrics with intrinsically low lattice thermal conductivity

Abstract

Half-Heusler (HH) alloys have been extensively studied as ternary systems with various intriguing physical properties since their discovery around a century ago. Particularly, HH semiconductors show promising potential as high-temperature...

TaFeSb-Based Half-Heusler Thermoelectrics with High zT > 1 through the Alloying Effect

“…The uncertainties of zT were ±15%−20%. 38 The low-temperature Hall coefficients and electrical conductivities from 10 to 300 K were carried out using the PPMS system (Quantum Design, USA) with an excitation current of 4 mA. The Hall carrier concentration was calculated by p H = 1/eR H , and the Hall mobility was calculated by the formula μ H = σR H , where R H (error bar <5%) is the Hall coefficient and e is the unit charge.…”

“…The mass density was determined by Archimedes’ method in distilled water, and C P was estimated by the Dulong–Petit law. The uncertainties of zT were ±15%–20% . The low-temperature Hall coefficients and electrical conductivities from 10 to 300 K were carried out using the PPMS system (Quantum Design, USA) with an excitation current of 4 mA.…”

Approaching the minimum lattice thermal conductivity in TiCoSb half-Heusler alloys by intensified point-defect phonon scattering

“…More complex compositions such as vacancy-containing , double, triple and high-entropy HHs have been recently studied, providing interesting avenues to engineer novel compositions with improved thermoelectric performance. 31–33…”