Journal
JOURNAL OF CRYSTAL GROWTH
Volume 466, Issue -, Pages 56-63Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2017.03.020
Keywords
TGZM effect; Thermal stabilization; CoSb3; Thermoelectric properties
Funding
- Natural Science Foundation of Shanxi Province of China [2015JM5149]
- Foundation of State Key Lab of Solidification processing [101-QP-2014, 133-QP-2015]
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The Co-96.9 wt% Sb hypoeutectic alloy doped by 0.12 wt% YbFe was solidified in a Bridgman-type furnace based on temperature gradient zone melting (TGZM) effect. A mushy zone was observed between the complete liquid zone and the solid zone at different thermal stabilization time ranging from 15 min to 40 h. The mushy-zone solidified microstructures of the alloy only consist of CoSb3 and Sb phase. After 40 h thermal stabilization time, the volume fraction of CoSb3 in the mushy zone increases significantly up to 99.6% close to the solid-liquid interface. The hardness and fracture toughness of doped CoSb3 can reach 7.01 +/- 0.69 GPa and 0.78 +/- 0.08 MPa.m(1/2), respectively. Meanwhile, the thermoelectric properties of the alloy were measured ranging from room temperature (RT) to 850 K. The Seebeck coefficient of the specimen prepared by TGZM effect after 40 h could reach 155 mu V/K and the ZT value is 0.47 at 660 K, showing that it is feasible to prepare CoSb3 bulk material via TGZM effect. As a simple and one-step solidification method, the TGZM technique could be applied in the preparation of skutterudite compounds. (C) 2017 Elsevier B.V. All rights reserved.
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