Transport and mechanical property evaluation of (AgSbTe){sub 1-x}(GeTe){sub x} (x=0.80, 0.82, 0.85, 0.87, 0.90)
- Materials and Processes Laboratory, GM R and D Center, Warren, MI 48090 (United States)
- Optimal, Inc. Plymouth Township, MI 48170 (United States)
- High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
(AgSbTe{sub 2}){sub 1-x}(GeTe){sub x} (known collectively by the acronym of their constituent elements as TAGS-x, where x designates the mole fraction of GeTe) materials, despite being described over 40 years ago, have only recently been studied in greater detail from a fundamental standpoint. We have prepared a series of samples with composition (AgSbTe{sub 2}){sub 1-x}(GeTe){sub x} (x=0.80, 0.82, 0.85, 0.87 and 0.90). Cast ingots of the above compositions were ground and consolidated by spark plasma sintering (SPS). Sintering conditions, specifically high applied pressures of 65 MPa and slow heating rates, were identified as important variables that lead to samples with low porosity and good mechanical strength. The resulting ingots were cut for high temperature electrical, thermal transport and mechanical property evaluation. TAGS-85 was found to have the highest ZT of all samples investigated (ZT=1.36 at 700 K) as a result of its very low value of thermal conductivity. Hall effect measurements performed from 5 to 300 K found these materials to have complex multi-band transport characteristics. - Graphical Abstract: Powder X-ray diffraction of TAGS-x (x=0.80, 0.82, 0.85, 0.87 and 0.90) showing characteristic bifurcation indicative of rhombohedral structure.
- OSTI ID:
- 21370525
- Journal Information:
- Journal of Solid State Chemistry, Vol. 182, Issue 8; Other Information: DOI: 10.1016/j.jssc.2009.05.024; PII: S0022-4596(09)00222-9; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIMONY COMPOUNDS
CHARGED-PARTICLE TRANSPORT
EVALUATION
GERMANIUM TELLURIDES
HALL EFFECT
HEATING RATE
MECHANICAL PROPERTIES
PRESSURE RANGE MEGA PA 10-100
SILVER COMPOUNDS
SINTERING
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
THERMAL CONDUCTIVITY
TRIGONAL LATTICES
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
FABRICATION
GERMANIUM COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE RANGE
PRESSURE RANGE MEGA PA
RADIATION TRANSPORT
SCATTERING
TELLURIDES
TELLURIUM COMPOUNDS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS