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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50289

Title: The thermal expansion coefficient as a key design parameter for thermoelectric materials and its relationship to processing-dependent bloating
Authors: Jennifer E. Ni
Eldon D. Case
Robert D. Schmidt
Chun-I Wu
Timothy P. Hogan
Rosa M. Trejo
Melanie J. Kirkham
Edgar Lara-Curzio
Mercouri G. Kanatzidis
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Keywords: PbTe
Thermoelectric Material
Dilatometry
Bulk Specimen
Powder Specimen
Date: 2013-05
Issue Date: 2018-09-28T06:51:57Z
Publisher: Journal of Materials Science
Abstract: Abstract: The coefficient of thermal expansion (CTE) is a key design parameter for thermoelectric (TE) materials, especially in energy harvesting applications since stresses generated by CTE mismatch, thermal gradients, and thermal transients scale with the CTE of the TE material. For the PbTe–PbS-based TE material (Pb0.95Sn0.05Te)0.92(PbS)0.08—0.055 % PbI2 over the temperature ranges of 293–543 and 293–773 K, a CTE, αavg, of 21.4 ± 0.3 × 10−6 K−1 was measured using (1) dilatometry and (2) high-temperature X-ray diffraction (HT-XRD) for powder and bulk specimens. The CTE values measured via dilatometry and HT-XRD are similar to the literature values for other Pb-based chalcogenides. However, the processing technique was found to impact the thermal expansion such that bloating (which leads to a hysteresis in thermal expansion) occurred for hot pressed billets heated to temperatures >603 K while specimens fabricated by pulsed electric current sintering and as-cast specimens did not show a bloating-modified thermal expansion even for temperatures up to 663 K. The relationship of bloating to the processing techniques is discussed, along with a possible mechanism for inhibiting bloating in powder processed specimens.
Relation: 48(18) pp.6233–6244
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50289
Appears in Collections:[機械與機電工程學系] 期刊論文

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