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

Wu, H.-J and Chen, S.-W and Ikeda, T. and Snyder, G. J. (2012) Formation of ordered nano-wire microstructures in thermoelectric Pb–Ag–Sb–Te. Acta Materialia, 60 (3). pp. 1129-1138. ISSN 1359-6454. doi:10.1016/j.actamat.2011.10.056. https://resolver.caltech.edu/CaltechAUTHORS:20120403-133432192

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Abstract

Regular arrays of nano-wire microstructures containing Ag_2Te rods with diameter <400 nm and inter-rod distance <1 μm are formed in a matrix of AgSbTe_2 + δ-Sb_2Te, which makes an ordered nano-wire composite thermoelectric material. This microstructure is formed during eutectic solidification processing. To understand and guide production of uniform bulk samples of this composite, the liquidus projection of quaternary Pb–Ag–Sb–Te system at 36.0 at.% Te isoplethal section is constructed experimentally, using quenched samples. A three-phase univariant reaction of the quaternary Pb–Ag–Sb–Te system, L → AgSbTe_2 + Ag_2Te + δ-Sb_2Te, is investigated, between a ternary-eutectic melt (Ag–40.0 at.% Sb–36.0 at.% Te) and a quaternary melt (Pb–22.0 at.% Ag–40.0 at.% Sb–36.0 at.% Te), at 496.1 °C and 503.9 °C, respectively. High-resolution transmission electron microscopy confirms that these three phases are simultaneously present at the nanometer scale. Furthermore, unidirectional solidification experiments of the ternary eutectic alloy using the Bridgman method are carried out to examine the alloy’s solidification behavior.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2011.10.056DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S1359645411007713PublisherUNSPECIFIED
ORCID:
AuthorORCID
Ikeda, T.0000-0001-7076-6958
Snyder, G. J.0000-0003-1414-8682
Additional Information:© 2011 Acta Materialia Inc. Published by Elsevier Ltd. Received 3 August 2011; received in revised form 27 October 2011; accepted 28 October 2011. Available online 15 December 2011. The authors acknowledge the financial support of National Science Council of Taiwan (NSC 99-2221-E-007-093-MY3 and Grant 100-2917-I-007-001) and of the Air Force Office of Scientific Research (AFOSR MURI FA9550-10-1-0533) of USA.
Funders:
Funding AgencyGrant Number
National Science Council (Taiwan)NSC 99-2221-E007-093-MY3
National Science Council (Taiwan)100-2917-I-007-001
Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI)FA9550-10-1-0533
Subject Keywords: Solidification microstructure; Thermodynamics; Eutectic solidification; Nanostructure; Bridgman technique
Issue or Number:3
DOI:10.1016/j.actamat.2011.10.056
Record Number:CaltechAUTHORS:20120403-133432192
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120403-133432192
Official Citation:H.-J. Wu, S.-W. Chen, T. Ikeda, G.J. Snyder, Formation of ordered nano-wire microstructures in thermoelectric Pb–Ag–Sb–Te, Acta Materialia, Volume 60, Issue 3, February 2012, Pages 1129-1138, ISSN 1359-6454, 10.1016/j.actamat.2011.10.056. (http://www.sciencedirect.com/science/article/pii/S1359645411007713)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29963
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Apr 2012 20:50
Last Modified:09 Nov 2021 19:33

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