Transport and mechanical property evaluation of (AgSbTe){sub 1-x}(GeTe){sub x} (x=0.80, 0.82, 0.85, 0.87, 0.90)

(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 ha...

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Bibliographic Details
Published in:Journal of solid state chemistry 2009-08, Vol.182 (8)
Main Authors: Salvador, James R., Yang, J., Shi, X., Wang, H., Wereszczak, A.A.
Format: Article
Language:English
Subjects:
ANTIMONY COMPOUNDS
CHALCOGENIDES
CHARGED-PARTICLE TRANSPORT
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
EVALUATION
FABRICATION
GERMANIUM COMPOUNDS
GERMANIUM TELLURIDES
HALL EFFECT
HEATING RATE
MATERIALS SCIENCE
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
PRESSURE RANGE
PRESSURE RANGE MEGA PA
PRESSURE RANGE MEGA PA 10-100
RADIATION TRANSPORT
SCATTERING
SILVER COMPOUNDS
SINTERING
TELLURIDES
TELLURIUM COMPOUNDS
TEMPERATURE RANGE
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
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES
X-RAY DIFFRACTION
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Summary:(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.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2009.05.024