Published December 2014 | Version v1
Journal article Metadata-only

Process controls for Bi2Te3-Sb2Te3 prepared by mechanical alloying and hot pressing

Creators

  • 1. Korea National University of Transportation, Chungju (Korea, Republic of)
  • 2. Korea University of Technology and Education, Cheonan (Korea, Republic of)
  • 3. Korea Institute of Ceramic Engineering and Technology, Seoul (Korea, Republic of)
  • 4. Heesung Metal, Ltd., Incheon (Korea, Republic of)

Description

p-Type Bi2Te3-Sb2Te3 solid solutions were prepared by mechanical alloying (MA) and hot pressing (HP) under different process conditions, after which the transport and the thermoelectric properties were evaluated. The relative densities of all hot-pressed specimens were over 98%, and the microstructure and crystal orientation were independent of the HP direction. All specimens exhibited p-type conduction, and the electrical resistivity was observed to increase slightly with increasing temperature, indicating a degenerate semiconductor behavior. The carrier concentration decreased with increasing HP temperature while the mobility increased. The maximum figure of merit obtained was 0.86 at 323 K for Bi0.5Sb1.5Te3 hot-pressed at 648 K.

Additional details

Publishing Information

Journal Title
Journal of the Korean Physical Society
Journal Volume
65
Journal Issue
12
Series
26 refs, 6 figs
Journal Page Range
p. 2066-2070
ISSN
0374-4884

INIS

Country of Publication
Korea, Republic of
Country of Input or Organization
Korea, Republic of
INIS RN
47086709
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANTIMONY TELLURIDES; BISMUTH TELLURIDES; CARRIER DENSITY; ELECTRIC CONDUCTIVITY; HOT PRESSING; SOLID SOLUTIONS; THERMOELECTRIC PROPERTIES; TRANSPORT
Descriptors DEC
ANTIMONY COMPOUNDS; BISMUTH COMPOUNDS; CHALCOGENIDES; DISPERSIONS; ELECTRICAL PROPERTIES; FABRICATION; HOMOGENEOUS MIXTURES; MATERIALS WORKING; MIXTURES; PHYSICAL PROPERTIES; PRESSING; SOLUTIONS; TELLURIDES; TELLURIUM COMPOUNDS