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Formation of highly oriented large nanoscale In_2Te_3 precipitates in bulk Bi_2Te_3

Heinz, Nicholas A. and Ikeda, Teruyuki and Snyder, G. Jeffrey (2012) Formation of highly oriented large nanoscale In_2Te_3 precipitates in bulk Bi_2Te_3. Acta Materialia, 60 (11). pp. 4461-4467. ISSN 1359-6454. doi:10.1016/j.actamat.2012.05.004. https://resolver.caltech.edu/CaltechAUTHORS:20120824-155746562

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Abstract

Nucleation and growth precipitation experiments were conducted on samples of In-alloyed Bi_2Te_3 with a starting composition of Bi_(1.65)In_(0.35)Te_(3) (7 at.% In) to investigate the phase diagram of the Bi_2Te_3–In_2Te_3 system. Temperature-dependent equilibrium solubilities were determined at 500 and 450 °C and also the maximum solubility of In in Bi_2Te_3 was verified by unidirectional solidification using the Bridgman method. The In_2Te_3 structures formed during precipitation are either plates or elongated ribbons with thicknesses of the order of hundreds of nanometers with a heavily temperature-dependent spacing distribution. All in-grain precipitation occurs along the {0 0 0 1} family of planes in Bi_2Te_3. The orientation relationship between Bi_2Te_3–In_2Te_3 was found to be {0 0 0 1}Bi_2Te_3 || {1 1 1}In_2Te_3 and consequently 〈 1 1 2¯ 0 〉 Bi_2Te_3 || 〈1 1 0〉 In_2Te_3, which aligns the close-packed planes and directions. The resulting matrix is expected to be lightly doped and may be suitable for microstructure engineering for near room temperature thermoelectric applications.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2012.05.004DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S1359645412003114PublisherUNSPECIFIED
ORCID:
AuthorORCID
Ikeda, Teruyuki0000-0001-7076-6958
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2012 Acta Materialia Inc. Published by Elsevier Ltd. Received 8 February 2012; accepted 2 May 2012; Available online 7 June 2012. This work was supported by ZT Plus and the AFOSR-MURI for cryogenic Peltier cooling.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR) MURIUNSPECIFIED
ZT PlusUNSPECIFIED
Subject Keywords:Bulk thermoelectric Bi2Te3; Microstructure; Heterogeneous nucleation of phase transformations; Precipitation; Nanocomposite
Issue or Number:11
DOI:10.1016/j.actamat.2012.05.004
Record Number:CaltechAUTHORS:20120824-155746562
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120824-155746562
Official Citation:Nicholas A. Heinz, Teruyuki Ikeda, G. Jeffrey Snyder, Formation of highly oriented large nanoscale In2Te3 precipitates in bulk Bi2Te3, Acta Materialia, Volume 60, Issue 11, June 2012, Pages 4461-4467, ISSN 1359-6454, 10.1016/j.actamat.2012.05.004. (http://www.sciencedirect.com/science/article/pii/S1359645412003114)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33532
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:27 Aug 2012 15:23
Last Modified:09 Nov 2021 21:35

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