Synthesis and structure of layered compounds in the PbTe-Bi2Te3 and PbTe-Sb2Te3 systems

Shelimova, L. E.; Karpinskii, O. G.; Svechnikova, T. E.; Avilov, E. S.; Kretova, M. A.; Zemskov, V. S.

doi:10.1007/s10789-005-0069-1

Cited by 77 publications

(62 citation statements)

References 7 publications

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“…The SOC was included by a second variational procedure [19,20]. The calculations were carried out with the experimental lattice parameters for bulk PbBi 2 Se 4 , PbSb 2 Te 4 and Pb 2 Bi 2 Se 5 , and with the fully optimized geometry for the others, because crystal structures of n = 1 compounds and Pb 2 Bi 2 Se 5 were reported experimentally [21][22][23] and those of other n's are designed here theoretically. The muffin-tin radii of Pb, Bi, and Se are 3.0, 2.9, and 2.4, respectively.…”

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confidence: 99%

Candidates for topological insulators: Pb-based chalcogenide series

et al. 2011

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To date, Bi 2 Se 3 is known as the best three-dimensional high temperature topological insulator with a large bulk band gap. Here, we theoretically predict that the series of Pb-based layered chalcogenides, Pb n Bi 2 Se n+3 and Pb n Sb 2 Te n+3 , are possible new candidates for topological insulators. As n increases, the phase transition from a topological insulator to a band insulator is found to occur between n = 2 and 3 for both series. Significantly, among the new topological insulators, we found a bulk band gap of 0.40eV in PbBi 2 Se 4 which is one of the largest gap topological insulators, and that Pb 2 Sb 2 Te 5 is located in the immediate vicinity of the topological phase boundary, making its topological phase easily tunable by changing external parameters such as lattice constants. Due to the three-dimensional Dirac cone at the phase boundary, massless Dirac fermions also may be easily accessible in Pb 2 Sb 2 Te 5 .

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confidence: 99%

Candidates for topological insulators: Pb-based chalcogenide series

et al. 2011

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“…3. We attribute the lamellar microstructure of the eutectic and Sb rich alloys to the layered crystalline structures of the constituent phases, Pb 2 Sb 6 Te 11 and Sb 2 Te 3 [2,3]. In contrast, PbTe has a cubic structure (rocksalt type) [4].…”

Section: Methodsmentioning

confidence: 99%

Solidification processing of Te-Sb-Pb alloys for thermoelectric applications

Ikeda

Azizgolshani

Haile

et al. 2005

ICT 2005. 24th International Conference on Thermoelectrics, 2005.

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A solidification processing approach to the refinement of lead-tellurium-antimony alloy microstructure is described. Liquid alloys with eutectic, hyper-eutectic and hypo-eutectic compositions (relative to lead) were cooled to the solid state in three distinct ways, i.e. by water quenching, air cooling and furnace cooling. The structures of the alloys resulting from the three different solidification paths were examined using electron microscopy and the micrographs were quantified. Classical solidification methods were used to interpret the structures in relation to the cooling histories.

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“…The period of similar atomic stacking within a unit cell of Pb 2 Sb 6 Te 11 was taken to be 1.4 nm [9]. The Pb 2 Sb 6 Te 11 phase is highly disordered in the cationic substructure; however, the Sb 2 Te 3 and PbTe phases are significantly more ordered.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…The Pb 2 Sb 6 Te 11 phase is highly disordered in the cationic substructure; however, the Sb 2 Te 3 and PbTe phases are significantly more ordered. The low thermal conductivity of Pb 2 Sb 6 Te 11 may be due to one two possibilities: (a) disorder in the metallic sites [9] and (b) the small layer period and consequent increase in the total area of the "interfaces" of the crystalline layers.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Lattice thermal conductivity of self-assembled PbTe-Sb<inf>2</inf>Te<inf>3</inf> composites with nanometer lamellae

Ikeda

Toberer

Ravi

et al. 2007

2007 26th International Conference on Thermoelectrics

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In the system of PbTe and Sb 2 Te 3 , a metastable compound Pb 2 Sb 6 Te 11 appears by solidification processing. It has been reported that heat treatments decomposes this compound into two immiscible thermoelectric materials forming nanosized lamellar structure. The fraction transformed and the interlamellar spacing was systematically investigated. In this work, the thermal conductivities and the electrical resistivities have been measured as functions of annealing time through the transformation and the coarsening processes to clarify the effect of the fraction transformed and the inter-lamellar spacing. The thermal conductivity of Pb 2 Sb 6 Te 11 is lower than that after the decomposition. The lattice part of the thermal conductivity of PbTe/Sb 2 Te 3 lamellar samples decreases with deccreasing inter-lamellar spacing. This is considered to be due to the coarsening of the microstructure. IntroductionIn order for thermoelectric devices to be more commonly used in large industrial fields for effective use of heat or electrical energy, it is essential to discover materials with a high thermoelectric figure of merit, zT, defined as S

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Synthesis and structure of layered compounds in the PbTe-Bi2Te3 and PbTe-Sb2Te3 systems

Cited by 77 publications

References 7 publications

Candidates for topological insulators: Pb-based chalcogenide series

Candidates for topological insulators: Pb-based chalcogenide series

Solidification processing of Te-Sb-Pb alloys for thermoelectric applications

Lattice thermal conductivity of self-assembled PbTe-Sb<inf>2</inf>Te<inf>3</inf> composites with nanometer lamellae

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