Purification of tellurium up to 5N by vacuum distillation

Prasad, Dev; Munirathnam, N. R.; Rao, J. V.; Prakash, T. L.

doi:10.1016/j.matlet.2005.02.012

Cited by 37 publications

(1 citation statement)

References 6 publications

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“…Starting from the core (centre of the image) of the dislocation, one (001) and two (111) extra half planes of atoms are observed and marked by yellow arrows. The Burgers vectors of the dislocation is determined to be B D =1/2[01], which is generally observed in NaCl structures47. Based on a few low magnification STEM images, the average areal dislocation density ( N D ) is estimated to be ∼4 × 10 12 cm −2 ; this is an extremely high value compared with that typically reported in semiconductors30.…”

Section: Resultsmentioning

confidence: 93%

Vacancy-induced dislocations within grains for high-performance PbSe thermoelectrics

et al. 2017

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To minimize the lattice thermal conductivity in thermoelectrics, strategies typically focus on the scattering of low-frequency phonons by interfaces and high-frequency phonons by point defects. In addition, scattering of mid-frequency phonons by dense dislocations, localized at the grain boundaries, has been shown to reduce the lattice thermal conductivity and improve the thermoelectric performance. Here we propose a vacancy engineering strategy to create dense dislocations in the grains. In Pb1−xSb2x/3Se solid solutions, cation vacancies are intentionally introduced, where after thermal annealing the vacancies can annihilate through a number of mechanisms creating the desired dislocations homogeneously distributed within the grains. This leads to a lattice thermal conductivity as low as 0.4 Wm−1 K−1 and a high thermoelectric figure of merit, which can be explained by a dislocation scattering model. The vacancy engineering strategy used here should be equally applicable for solid solution thermoelectrics and provides a strategy for improving zT.

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Section: Resultsmentioning

confidence: 93%