Title page for etd-0625117-134910


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URN etd-0625117-134910
Author Ping-Yuan Deng
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Phase diagram of quaternary Ge-Sn-Co-Sb system and
thermoelectric properties of (Ge,Sn) doped skutterudite CoSb3
Date of Defense 2017-06-28
Page Count 174
Keyword
  • Liquidus projection
  • Skutterudite
  • thermoelectric materials
  • CoSb3
  • Ge-Sn-Co-Sb
  • thermoelectric property
  • Abstract 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 300 K-700 K. Among the Ge/Sn-doped CoSb3, the alloy with 1 at% Ge content reaches the highest peak value of zT~ 0.28 at 661 K, showing 123 % enhancement compared with that of undoped CoSb3.
    Advisory Committee
  • Shih-kang Lin - chair
  • P. C. Wei - co-chair
  • Jing-yi Huang - co-chair
  • Hsin-Jay Wu - advisor
  • Files
  • etd-0625117-134910.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2017-08-11

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