Formation of ordered nano-wire microstructures in thermoelectric Pb–Ag–Sb–Te

Wu, Hsin‐Jay; Chen, S. W.; Ikeda, Teruyuki; Snyder, G. Jeffrey

doi:10.1016/j.actamat.2011.10.056

Cited by 23 publications

(12 citation statements)

References 27 publications

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“…[ 49,50 ] All of the same morphological control parameters are employed ( S f and ∇T < ) in this type of experiment, however because the solidifi cation is directional, the interface control is substantial, allowing one to tailor the alignment of the resulting microstructure. In this process the entirety of the material is melted and one end is brought into a zone of decreased temperature initiating solidifi cation.…”

Section: Solidifi Cation Morphologymentioning

confidence: 99%

Applying Quantitative Microstructure Control in Advanced Functional Composites

Heinz

Ikeda

Pei

et al. 2013

Adv Funct Materials

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Microstructure control in functional materials draws from a historical reserve rich in established theory and experimental observation of metallurgy. Methods such as rapid solidifi cation, eutectoid reaction, and nucleation and growth precipitation have all proven to be effective means to produce microstructure relevant for a wide array of applications. Here, the available parameters to control structure morphology, size, and spacing are discussed using thermoelectric composites as an example. Moreover, exploiting different aspects of a material system's phase diagram enables a controlled introduction of nanostructures. While much of this discussion is pertinent to the rapidly developing fi eld of thermal conductivity control in thermoelectric composites, these techniques can be applied to a variety of other material systems where their use may lead to novel electrical, optical, as well as thermal properties of semiconductors and insulators as it has in the past for the mechanical properties of metals.

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Section: Solidifi Cation Morphologymentioning

confidence: 99%

Applying Quantitative Microstructure Control in Advanced Functional Composites

Heinz

Ikeda

Pei

et al. 2013

Adv Funct Materials

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“…Recent attempts to control the formation of nanostructures in bulk thermoelectric materials involve a microstructure engineering approach whereby phase‐separation processes are manipulated to generate a nanoscale second phase that is embedded within the parent thermoelectric material. This has been demonstrated in PbTe and GeTe systems using a variety of approaches, including precipitation,11–13 nucleation and growth and spinodal decomposition,14–16 eutectic,17–20 and matrix encapsulation methods 21, 22. In each of these examples, the parent “matrix” material and second minor phase must be judiciously chosen considering phase stability and compatibility in thermoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Phase Separation in High Performance PbTe–PbS Thermoelectric Materials

Girard

Schmidt‐Rohr

Chasapis

et al. 2012

Adv Funct Materials

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Phase immiscibility in PbTe–based thermoelectric materials is an effective means of top‐down synthesis of nanostructured composites exhibiting low lattice thermal conductivities. PbTe1‐x Sx thermoelectric materials can be synthesized as metastable solid solution alloys through rapid quenching. Subsequent post‐annealing induces phase separation at the nanometer scale, producing nanostructures that increase phonon scattering and reduce lattice thermal conductivity. However, there has yet to be any study investigating in detail the local chemical structure of both the solid solution and nanostructured variants of this material system. Herein, quenched and annealed (i.e., solid solution and phase‐separated) samples of PbTe–PbS are analyzed by in situ high‐resolution synchrotron powder X‐ray diffraction, solid‐state 125Te nuclear magnetic resonance (NMR), and infrared (IR) spectroscopy analysis. For high concentrations of PbS in PbTe, e.g., x >16%, NMR and IR analyses reveal that rapidly quenched samples exhibit incipient phase separation that is not detected by state‐of‐the‐art synchrotron X‐ray diffraction, providing an example of a PbTe thermoelectric “alloy” that is in fact phase inhomogeneous. Thermally‐induced PbS phase separation in PbTe–PbS occurs close to 200 °C for all compositions studied, and the solubility of the PbS phase in PbTe at elevated temperatures >500 °C is reported. The findings of this study suggest that there may be a large number of thermoelectric alloy systems that are phase inhomogeneous or nanostructured despite adherence to Vegard's Law of alloys, highlighting the importance of careful chemical characterization to differentiate between thermoelectric alloys and composites.

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“…Ag 5 Te 3 þ Te þ PbTe at 339 C) featured self-assembled nanostructuring lamellae may be promising for TE applications. 15 Given that the ternary eutectic alloy possesses stronger mechanical strength and promising thermoelectric properties (i.e., composed of a semiconductor PbTe and a metal phase 11 ), a synthesis route is carried out, by using the modified Bridgman method, 16,17 with compositions lying close to the Ag-Pb-Te ternaryeutectic point. 17 The synthesis process started with pure elements; Ag shots (99.99 wt.…”

mentioning

confidence: 99%

“…The as-prepared ingots were used for unidirectionally solidification, by using the modified Bridgman method. 16,17 The as-solidified plate sample with relative high density (>95%, as listed in Table I) was used for metallographic observations by using a field-emission scanning electron microscope (FE-SEM, Carl Zeiss LEO 1550VP) equipped with a backscattered electron (BSE) detector. An energy dispersive spectrometer (EDS, Oxford 6587, England) was used for chemical compositional analysis.…”

mentioning

confidence: 99%

Ternary eutectic growth of nanostructured thermoelectric Ag-Pb-Te materials

Foo

Chen

et al. 2012

Applied Physics Letters

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Selective growth of ZnO nanorods and their applications to ferroelectric nanorods J. Appl. Phys. 112, 034111 (2012) Biological colloid engineering: Self-assembly of dipolar ferromagnetic chains in a functionalized biogenic ferrofluid Appl. Phys. Lett. 101, 063701 (2012) Self-assembly of single dielectric nanoparticle layers and integration in polymer-based solar cells Appl. Phys. Lett. 101, 063105 (2012) Patterned substrates to facilitate long-range ordering in the formation of nanoparticle monolayers by electrophoretic deposition Appl. Phys. Lett. 101, 043117 (2012) High compositional homogeneity in In-rich InGaAs nanowire arrays on nanoimprinted SiO2/Si (111)

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Formation of ordered nano-wire microstructures in thermoelectric Pb–Ag–Sb–Te

Cited by 23 publications

References 27 publications

Applying Quantitative Microstructure Control in Advanced Functional Composites

Applying Quantitative Microstructure Control in Advanced Functional Composites

Analysis of Phase Separation in High Performance PbTe–PbS Thermoelectric Materials

Ternary eutectic growth of nanostructured thermoelectric Ag-Pb-Te materials

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