Pb–Te–O phase equilibrium diagram and the lead telluride thermal oxidation

Berchenko, N. N.; Fadeev, S.; Savchyn, V.; Kurbanov, K.; Trzyna, M.; Cebulski, J.

doi:10.1016/j.tca.2013.12.004

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…Oxidation of thermoelectric materials is their reaction with oxygen from surrounding air. For PbTe-based materials, models by Berchenko et al show that PbTeO 3 already starts to form at temperatures of 673 K [14]. The influence of the partial pressure of oxygen on the oxidation of PbTe is analyzed by Chen et al With a rising partial pressure, the oxidation rate rises as well [15].…”

Section: Thermoelectric Modulesmentioning

confidence: 99%

Experimental Analysis of the Long-Term Stability of Thermoelectric Generators under Thermal Cycling in Air and Argon Atmosphere

et al. 2023

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It is estimated that 72% of the worldwide primary energy consumption is lost as waste heat. Thermoelectric Generators (TEGs) are a possible solution to convert a part of this energy into electricity and heat for space heating. However, for their deployment a proven long-term operation is required. Therefore, this research investigates the long-term stability of TEGs on system level in air and argon atmosphere under thermal cycling up to 543 K. The layout of the examined test objects resembles a TEG in stack design. The results show that the maximal output power of the test object in air reaches a plateau at 57% of the initial power after 50 cycles caused by an increased electrical resistance of the system. Whereas the test object in argon atmosphere shows no significant degradation of electrical power or resistance. The findings represent a step towards the understanding of the long-term stability of TEGs and can be used as a guideline for design decisions.

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Section: Thermoelectric Modulesmentioning

confidence: 99%

Experimental Analysis of the Long-Term Stability of Thermoelectric Generators under Thermal Cycling in Air and Argon Atmosphere

et al. 2023

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“…We have described the method to build the phase equilibrium diagram for the Pb–Te–O system in this case . Figure shows a typical diagram at 298 K. The diagrams obtained for the materials investigated in our experiment can be divided in two categories.…”

Section: Pb(sn)–te(se)–o Phase Equilibrium Diagramsmentioning

confidence: 99%

Comparison of oxidation processes in binary selenides and tellurides

Berchenko

Story

Trzyna

et al. 2016

Surface & Interface Analysis

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a To predict the grain boundaries composition of the nanocomposite thermoelectric IV-VI devices the oxidation processes in PbTe, SnTe, PbSe, SnSe and in some their solid solutions were studied. The initial oxidation stages were investigated by applying the potentiostatic anodic scan. The Auger electron spectroscopy, cathodoluminescence and X-ray diffraction were used to characterize the composition of the anodic and thermal oxides films. The obtained results demonstrate that the oxidation processes and the oxide composition are near the same at the substitution in the chalcogen sublattice (Te → Se), but they are strongly changed at the substitution in the metal sublattice (Pb → Sn). Under the same growing conditions, the grain boundaries will consist mainly of an amorphous tin oxide in SnTe and SnSe nanocomposites, and the ternary oxide forms the grain boundaries in PbTe and PbSe nanocomposites. In the solid solutions with the Sn occurrence in the metal sublattice tin oxidation becomes a prevailing process, even in case of low tin content.

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“…Lead telluride (PbTe) is one of the most representative semiconductors in the IV–VI group compounds, and it attracts much research interest due to its outstanding thermoelectric and photovoltaic properties. − As Pb has an oxidation state of +2 or +4 and tellurium has a −2 oxidation state, compounds with 1:1 and 1:2 stoichiometries are expected to exist in the Pb–Te binary system. At ambient conditions, only the 1:1 stoichiometric PbTe compound has been observed . The PbTe compound has a rocksalt B1 crystal structure with a narrow band gap and does not show any temperature-induced phase transition below the melting point. , By exerting a hydrostatic pressure of approximately 6 GPa, PbTe undergoes a structural phase transition into an orthorhombic structure with a space group of Pnma (β-FeB prototype). , At a higher pressure above 13 GPa, PbTe transforms into the body-centered cubic B2 phase ( Pm 3̅ m space group), which was reported to have a superconducting transition temperature of ∼8 K at 17.5 GPa…”

Section: Introductionmentioning

confidence: 99%

“…At ambient conditions, only the 1:1 stoichiometric PbTe compound has been observed. 4 The PbTe compound has a rocksalt B1 crystal structure with a narrow band gap and does not show any temperature-induced phase transition below the melting point. 5,6 By exerting a hydrostatic pressure of approximately 6 GPa, PbTe undergoes a structural phase transition into an orthorhombic structure with a space group of Pnma (β-FeB prototype).…”

Section: ■ Introductionmentioning

confidence: 99%

Unveiling a Novel, Cation-Rich Compound in a High-Pressure Pb–Te Binary System

Lin

et al. 2019

ACS Cent. Sci.

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Because of the common oxidation states of group IV elements (+2 or +4) and group VI elements (−2), 1:1 and 1:2 are two typical stoichiometries found in the IV–VI compounds. Particularly, in the Pb–Te binary system, the 1:1 stoichiometric PbTe is believed to be the only stable compound. Herein, using evolutionary algorithms, density functional theory, a laser-heated diamond anvil cell, and synchrotron X-ray diffraction experiments, we discovered a novel Pb–Te compound with an unexpected stoichiometry of 3:2 above 20 GPa. This tetragonal Pb 3 Te 2 is the one of the very few cation-rich compounds that has ever been discovered in the entire IV–VI binary system. Further analyses based on electron density distribution, electron localization function, and Bader charge have shown that this newly discovered compound has a mixed character of chemical bonding with a decreased ionicity. By further calculating the electron–phonon interaction, Pb 3 Te 2 is predicted to exhibit a superconducting transition at low temperatures. The discovery of Pb 3 Te 2 paves the way for further explorations of other novel cation-rich IV–VI group compounds.

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Pb–Te–O phase equilibrium diagram and the lead telluride thermal oxidation

Cited by 5 publications

References 12 publications

Experimental Analysis of the Long-Term Stability of Thermoelectric Generators under Thermal Cycling in Air and Argon Atmosphere

Experimental Analysis of the Long-Term Stability of Thermoelectric Generators under Thermal Cycling in Air and Argon Atmosphere

Comparison of oxidation processes in binary selenides and tellurides

Unveiling a Novel, Cation-Rich Compound in a High-Pressure Pb–Te Binary System

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