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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
Abstract
(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 (KIC) of the TAGS-90 sample due to inhibition of dislocation movement at the twin boundary.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Korean Ministry of Education, Science and Technology
- OSTI Identifier:
- 1355407
- Report Number(s):
- IS-J-9264
Journal ID: ISSN 1359-6454; PII: S1359645417300654
- Grant/Contract Number:
- NRF-2015R1D1A1A09060920; AC02-07CH11358
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 128; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Gas-atomization; TAGS; Spark plasma sintering; Nanostructures; Mechanical properties
Citation Formats
Kim, Hyo-Seob, Ames Lab., Ames, IA, Dharmaiah, Peyala, Madavali, Babu, Ott, Ryan, Lee, Kap-Ho, and Hong, Soon-Jik. 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. United States: N. p., 2017.
Web. doi:10.1016/j.actamat.2017.01.053.
Kim, Hyo-Seob, Ames Lab., Ames, IA, Dharmaiah, Peyala, Madavali, Babu, Ott, Ryan, Lee, Kap-Ho, & Hong, Soon-Jik. 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. United States. https://doi.org/10.1016/j.actamat.2017.01.053
Kim, Hyo-Seob, Ames Lab., Ames, IA, Dharmaiah, Peyala, Madavali, Babu, Ott, Ryan, Lee, Kap-Ho, and Hong, Soon-Jik. 2017.
"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". United States. https://doi.org/10.1016/j.actamat.2017.01.053. https://www.osti.gov/servlets/purl/1355407.
@article{osti_1355407,
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},
author = {Kim, Hyo-Seob and Ames Lab., Ames, IA and Dharmaiah, Peyala and Madavali, Babu and Ott, Ryan and Lee, Kap-Ho and Hong, Soon-Jik},
abstractNote = {(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 (KIC) of the TAGS-90 sample due to inhibition of dislocation movement at the twin boundary.},
doi = {10.1016/j.actamat.2017.01.053},
url = {https://www.osti.gov/biblio/1355407},
journal = {Acta Materialia},
issn = {1359-6454},
number = C,
volume = 128,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}
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Works referencing / citing this record:
Investigation of microstructure and thermoelectric properties of p-type BiSbTe/ZnO composites
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Employing Interfaces with Metavalently Bonded Materials for Phonon Scattering and Control of the Thermal Conductivity in TAGS‐ x Thermoelectric Materials
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