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Solution synthesis of a new thermoelectric Zn(1+x)Sb nanophase and its structure determination using automated electron diffraction tomography.

Birkel, Christina S. and Mugnaioli, Enrico and Gorelik, Tatiana and Kolb, Ute and Panthöfer, Martin and Tremel, Wolfgang (2010):
Solution synthesis of a new thermoelectric Zn(1+x)Sb nanophase and its structure determination using automated electron diffraction tomography.
In: Journal of the American Chemical Society, pp. 9881-9889, 132, (28), [Online-Edition: http://www.ncbi.nlm.nih.gov/pubmed/20586452],
[Article]

Abstract

Engineering materials with specific physical properties have recently focused on the effect of nanoscopic inhomogeneities at the 10 nm scale. Such features are expected to scatter medium- and long-wavelength phonons thereby lowering the thermal conductivity of the system. Low thermal conductivity is a prerequisite for effective thermoelectric materials, and the challenge is to limit the transport of heat by phonons, without simultaneously decreasing charge transport. A solution-phase technique was devised for synthesis of thermoelectric "Zn(4)Sb(3)" nanocrystals as a precursor for phase segregation into ZnSb and a new Zn-Sb intermetallic phase, Zn(1+delta)Sb, in a peritectoid reaction. Our approach uses activated metal nanoparticles as precursors for the synthesis of this intermetallic compound. The small particle size of the reactants ensures minimum diffusion paths, low activation barriers, and low reaction temperatures, thereby eliminating solid-solid diffusion as the rate-limiting step in conventional bulk-scale solid-state synthesis. Both phases were identified and structurally characterized by automated electron diffraction tomography combined with precession electron diffraction. An ab initio structure solution based on electron diffraction data revealed two different phases. The new pseudo-hexagonal phase, Zn(1+delta)Sb, was identified and classified within the structural diversity of the Zn-Sb phase diagram.

Item Type: Article
Erschienen: 2010
Creators: Birkel, Christina S. and Mugnaioli, Enrico and Gorelik, Tatiana and Kolb, Ute and Panthöfer, Martin and Tremel, Wolfgang
Title: Solution synthesis of a new thermoelectric Zn(1+x)Sb nanophase and its structure determination using automated electron diffraction tomography.
Language: English
Abstract:

Engineering materials with specific physical properties have recently focused on the effect of nanoscopic inhomogeneities at the 10 nm scale. Such features are expected to scatter medium- and long-wavelength phonons thereby lowering the thermal conductivity of the system. Low thermal conductivity is a prerequisite for effective thermoelectric materials, and the challenge is to limit the transport of heat by phonons, without simultaneously decreasing charge transport. A solution-phase technique was devised for synthesis of thermoelectric "Zn(4)Sb(3)" nanocrystals as a precursor for phase segregation into ZnSb and a new Zn-Sb intermetallic phase, Zn(1+delta)Sb, in a peritectoid reaction. Our approach uses activated metal nanoparticles as precursors for the synthesis of this intermetallic compound. The small particle size of the reactants ensures minimum diffusion paths, low activation barriers, and low reaction temperatures, thereby eliminating solid-solid diffusion as the rate-limiting step in conventional bulk-scale solid-state synthesis. Both phases were identified and structurally characterized by automated electron diffraction tomography combined with precession electron diffraction. An ab initio structure solution based on electron diffraction data revealed two different phases. The new pseudo-hexagonal phase, Zn(1+delta)Sb, was identified and classified within the structural diversity of the Zn-Sb phase diagram.

Journal or Publication Title: Journal of the American Chemical Society
Volume: 132
Number: 28
Divisions: 07 Department of Chemistry > Fachgebiet Anorganische Chemie
07 Department of Chemistry
Date Deposited: 25 Nov 2014 10:59
Official URL: http://www.ncbi.nlm.nih.gov/pubmed/20586452
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