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Preparation and characterization of Pd2Sn nanoparticles

Page, Katharine and Schade, Christina S. and Zhang, Jinping and Chupas, Peter J. and Chapman, Karena W. and Proffen, Thomas and Cheetham, Anthony K. and Seshadri, Ram (2007):
Preparation and characterization of Pd2Sn nanoparticles.
In: Materials Research Bulletin, pp. 1969-1975, 42, (12), [Online-Edition: http://linkinghub.elsevier.com/retrieve/pii/S002554080700202...],
[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: 2007
Creators: Page, Katharine and Schade, Christina S. and Zhang, Jinping and Chupas, Peter J. and Chapman, Karena W. and Proffen, Thomas and Cheetham, Anthony K. and Seshadri, Ram
Title: Preparation and characterization of Pd2Sn nanoparticles
Language: German
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: Materials Research Bulletin
Volume: 42
Number: 12
Uncontrolled Keywords: a,c,electron microscopy,intermetallic compounds,neutron scattering,x-ray diffraction
Divisions: 07 Department of Chemistry > Fachgebiet Anorganische Chemie
07 Department of Chemistry
Date Deposited: 25 Nov 2014 10:59
Official URL: http://linkinghub.elsevier.com/retrieve/pii/S002554080700202...
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