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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XVII
Presentation Title Liquidus Projection of Quaternary Ge-Sn-Co-Sb System and Thermoelectric Properties of Sn/Ge Doped Skutterudite CoSb3
Author(s) Ping-Yuan Deng, Hsin-Jay Wu
On-Site Speaker (Planned) Ping-Yuan Deng
Abstract Scope Thermoelectric materials and devices can generate electricity from thermal energy directly, and can be useful in waste heat recovery. The skutterudite CoSb3 has been a cost-effective alternative for the mid-temperature thermoelectric generator owing to its promising electrical transport properties. Herein, minor dopant of Ge or/and Sn is introduced into the CoSb3 for optimizing the thermal/electrical transport behaviors. Phase diagram of ternary Sn-Co-Sb and Ge-Co-Sb systems are crucial in illustrating the relationships between the phase stability, microstructures and thermal-to-electricity conversion, and have been determined by experiments. Herein the liquidus projections of ternary Ge-Co-Sb and Sn-Co-Sb system are constructed by collecting the information from various as-solidified Sn-Co-Sb and Ge-Co-Sb alloys. On the basis of as-determined phase diagram, selective ternary Ge-doped/Sn-doped CoSb3 alloys are synthesized and their thermoelectric properties are measured within 300K-700K. Among the Ge/Sn-doped CoSb3, the alloy with 1 at%Ge content reaches the highest peak value of zT~0.28 at 661K.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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