Thermoelectric Behaviors of Bi_0.3Sb_1.7Te_3.0 with Excess or Deficiency of Tellurium Prepared by Mechanical Alloying Followed by Hot Pressing

• Hirota Kenji

  Graduate School of Advanced Technology and Science, Tokushima University

• Kitamura Masato

  Graduate School of Advanced Technology and Science, Tokushima University

• Takagi Katsuhiro

  Graduate School of Advanced Technology and Science, Tokushima University

• Hasezaki Kazuhiro

  Department of Mechanical Science, Science and Technology Division, Graduate School of Technology, Industrial and Social Sciences, Tokushima University

Bibliographic Information

Other Title

• Thermoelectric Behaviors of Bi₀.₃Sb₁.₇Te₃.₀ with Excess or Deficiency of Tellurium Prepared by Mechanical Alloying Followed by Hot Pressing

Abstract

Bi_0.3Sb_1.7Te_3.0+x thermoelectric materials with a deficiency or excess of doped tellurium (x from −0.025 to +0.2) were prepared by mechanical alloying followed by hot pressing (MA-HP). The MA-HP sintered disks were dense and finely grained. X-ray diffraction (XRD) patterns showed that materials with x < 0.2 consisted of a single-phase Bi₂Te₃–Sb₂Te₃ solid solution. XRD and scanning electron microscopy showed that tellurium precipitation only occurred in the MA-HP sintered disk with x = 0.2. The thermoelectric properties of MA-HP sintered disks of Bi_0.3Sb_1.7Te_3.0+x with a tellurium-deficient region differed from those of disks with an excess-tellurium region. Tellurium deficiency, i.e., x < 0.05, was caused by dopant evaporation. Excess tellurium acted as a dopant for x > 0.075. The MA-HP sintered disk of Bi_0.3Sb_1.7Te_3.1, i.e., x = 0.1, had the maximum dimensionless figure of merit, ZT = 1.11, at room temperature. These results indicate that the thermoelectric properties of Bi_0.3Sb_1.7Te_3.0 thermoelectric materials with excess tellurium were better than those of tellurium-deficient ones.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 59 (8), 1233-1238, 2018-07-01

  The Japan Institute of Metals and Materials

Keywords

• thermoelectric materials
• mechanical alloying
• bismuth telluride
• tellurium doping

Details

• CRID: 1390282763022790400
• NII Article ID: 130007419811
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mf201704
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 029126262
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029126262
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/59/8/59_MF201704/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed