Energy & Environmental Science · 2012 · 289 citations · 28 references
Crystal StructureEngineeringThermoelectricsStronger Phonon ScatteringThermal ConductivitySemiconductorsAtomic MassSuperconductivityQuantum MaterialsLattice Thermal ConductivityThermal ConductionMaterials ScienceElectrical EngineeringPhysicsThermal TransportThermal PropertyAtomic PhysicsQuantum ChemistrySolid-state PhysicLower Thermal ConductivityHigh Temperature MaterialsNatural SciencesApplied PhysicsCondensed Matter PhysicsPhononThermoelectric MaterialP-type Half-heuslers Hf1−xtixcosb0.8sn0.2Thermal Properties
High lattice thermal conductivity has been the bottleneck for further improvement of the thermoelectric figure-of-merit (ZT) of half-Heuslers (HHs) Hf1−xZrxCoSb0.8Sn0.2. Theoretically, the lattice thermal conductivity can be reduced by exploring larger differences in the atomic mass and size in the crystal structure, leading to higher ZT. In this paper, we experimentally demonstrated that a lower thermal conductivity in p-type half-Heuslers can be achieved when Ti is used to replace Zr, i.e., Hf1−xTixCoSb0.8Sn0.2, due to larger differences in the atomic mass and size between Hf and Ti compared with Hf and Zr. The highest ZT peak, ∼1.0 at 800 °C, in the Hf1−xTixCoSb0.8Sn0.2 (x = 0.1, 0.2, 0.3, and 0.5) system was achieved using Hf0.8Ti0.2CoSb0.8Sn0.2, which makes this material useful in power generation applications.
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Convergence of electronic bands for high performance bulk thermoelectrics
Yanzhong Pei, Xiaoya Shi, Aaron D. LaLonde et al. · Nature · 2011 · 4K citations