Large-scale production of (GeTe)x (AgSbTe2)100$-$x (x=75, 80, 85, 90) with enhanced thermoelectric properties via gas-atomization and spark plasma sintering

Kim, Hyo-Seob; Dharmaiah, Peyala; Madavali, Babu; Ott, Ryan; Lee, Kap-Ho; Hong, Soon-Jik

doi:10.1016/j.actamat.2017.01.053

Title: Large-scale production of (GeTe)_x (AgSbTe₂)_100$$-$$x (x=75, 80, 85, 90) with enhanced thermoelectric properties via gas-atomization and spark plasma sintering

Journal Article · Mon Jan 30 00:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.01.053· OSTI ID:1355407

Kim, Hyo-Seob ^[1]; Dharmaiah, Peyala ^[1]; Madavali, Babu ^[1]; Ott, Ryan ^[2]; Lee, Kap-Ho ^[3]; Hong, Soon-Jik ^[1]

Kongju National Univ., Budae-dong, Cheonan, Chungnam (Korea). Division of Advanced Materials Engineering
Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering
Chungnam National Univ., Daejeon (South Korea). Dept. of Materials Science & Engineering

(GeTe)_x(AgSbTe₂)_100$$-$$x: TAGS thermoelectrics are an attractive class of materials due to their combination of non-toxicity and good conversion efficiency at mid-temperature ranges. Here in the present work, we have utilized energy and time efficient high-pressure gas atomization and spark-plasma sintering techniques for large-scale preparation of samples with varying composition (i.e., (GeTe)_x(AgSbTe₂)_100$$-$$x where x = 75, 80, 85, and 90). High-temperature x-ray diffraction was used to understand the phase transformation mechanism of the as-atomized powders. Detailed high-resolution transmission electron microscopy of the sintered samples revealed the presence of nanoscale precipitates, antiphase, and twin boundaries. The nanoscale twins and antiphase boundaries serve as phonon scattering centers, leading to the reduction of total thermal conductivity in TAGS-80 and 90 samples. The maximum ZT obtained was 1.56 at 623 K for TAGS-90, which was ~94% improvement compared to values previously reported. The presence of the twin boundaries also resulted in a high fracture toughness (K_IC) of the TAGS-90 sample due to inhibition of dislocation movement at the twin boundary.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Korean Ministry of Education, Science and Technology

Grant/Contract Number:: NRF-2015R1D1A1A09060920; AC02-07CH11358

OSTI ID:: 1355407

Report Number(s):: IS-J-9264; PII: S1359645417300654

Journal Information:: Acta Materialia, Vol. 128, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Investigation of microstructure and thermoelectric properties of p-type BiSbTe/ZnO composites Madavali, Babu; Lee, Chul-Hee; Kim, Hyo-Seob International Journal of Applied Ceramic Technology, Vol. 15, Issue 1 https://doi.org/10.1111/ijac.12789	journal	September 2017
Employing Interfaces with Metavalently Bonded Materials for Phonon Scattering and Control of the Thermal Conductivity in TAGS‐ x Thermoelectric Materials Rodenkirchen, Cynthia; Cagnoni, Matteo; Jakobs, Stefan Advanced Functional Materials, Vol. 30, Issue 17 https://doi.org/10.1002/adfm.201910039	journal	February 2020
Spontaneous room-temperature formation of broccoli-like Ag–GeTe nanostructures assisting filamentary resistive switching Imanishi, Yusuke; Hayashi, Hitoshi; Nakaoka, Toshihiro Journal of Materials Science, Vol. 53, Issue 17 https://doi.org/10.1007/s10853-018-2493-z	journal	May 2018
Discovery of low-temperature GeTe-based thermoelectric alloys with high performance competing with Bi ₂ Te ₃ Wang, Longquan; Li, Junqin; Zhang, Chunxiao Journal of Materials Chemistry A, Vol. 8, Issue 4 https://doi.org/10.1039/c9ta11901a	journal	January 2020

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Title: Large-scale production of (GeTe)x (AgSbTe2)100$$-$$x (x=75, 80, 85, 90) with enhanced thermoelectric properties via gas-atomization and spark plasma sintering

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Title: Large-scale production of (GeTe)_x (AgSbTe₂)_100$$-$$x (x=75, 80, 85, 90) with enhanced thermoelectric properties via gas-atomization and spark plasma sintering