Thermoelectric properties of spark plasma sintered lead telluride nanocubes

Bayikadi, Khasimsaheb; Neeleshwar, S.; Mandava, Srikanth; Bathula, Sivaiah; Gahtori, Bhasker; Srivsatava, Avanish Kumar; Amirthapandian, S.; Panigrahi, B. K.; Bhattacharya, Sriparna; Podila, Ramakrishna; Rao, Apparao M.

doi:10.1557/jmr.2015.227

Cited by 12 publications

(2 citation statements)

References 53 publications

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“…as present in alloys, plays an essential role in the grain-growth stagnation [62,48]. In our simulations, we observed that nanostructures of dimensions in the order of hundreds of nanometers could be stable at intermediate temperatures, as seen in different experiments [63,64], in the presence of voids as small as 20 − 50 nm. The fabrication Void-GB interaction energy as a function of the void-GB distance, where GB stands for grain boundary and r v is the void radius.…”

Section: Discussionsupporting

confidence: 69%

Thermal conductivity of porous polycrystalline PbTe

Troncoso

Chudziński

Todorov

et al. 2021

Phys. Rev. Materials

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PbTe is a leading thermoelectric material at intermediate temperatures, largely thanks to its low lattice thermal conductivity. However, its efficiency is too low to compete with other forms of power generation. This efficiency can be effectively enhanced by designing nanostructures capable of scattering phonons over a wide range of length scales to reduce the lattice thermal conductivity. The presence of grain boundaries can reduce the thermal conductivity to ∼ 0.5 Wm −1 K −1 for small vacancy concentrations and grain sizes. However, grains anneal at finite temperature, and equilibrium and metastable grain size distributions determine the extent of the reduction in thermal conductivity. In the present work, we propose a phase-field model informed by molecular dynamics simulations to study the annealing process in PbTe and how it is affected by the presence of grain boundaries and voids. We find that the thermal conductivity of PbTe is reduced by up to 35% in the porous material at low temperatures. We observe that a phase transition at a finite density of voids governs the kinetics of impeding grain growth by Zener pinning.

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Section: Discussionsupporting

confidence: 69%

Thermal conductivity of porous polycrystalline PbTe

Troncoso

Chudziński

Todorov

et al. 2021

Phys. Rev. Materials

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“…The current interest in PbTe nano-bars arises from their useful thermoelectric properties [ 7 ]. It is known that the presence of nano-bar-like formations in spark-plasma sintered (SPS) PbTe specimens increases the ZT value to approximately 0.45 at 300 K. Additionally, the total thermal conductivity is reduced [ 4 , 8 ]. Further studies reported that Se-doped and Tl-doped PbTe materials containing nano-bar-like formations of the microstructure reveal very attractive thermoelectric properties [ 1 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Observation of Electron-Beam-Induced Formation of Nano-Structures in PbTe

et al. 2021

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Nano-scaled thermoelectric materials attract significant interest due to their improved physical properties as compared to bulk materials. Well-shaped nanoparticles such as nano-bars and nano-cubes were observed in the known thermoelectric material PbTe. Their extended two-dimensional nano-layer arrangements form directly in situ through electron-beam treatment in the transmission electron microscope. The experiments show the atomistic depletion mechanism of the initial crystal and the recrystallization of PbTe nanoparticles out of the microparticles due to the local atomic-scale transport via the gas phase beyond a threshold current density of the beam.

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