The Thermo-Mechanical Response of GeTe under Compression
Thermoelectric generators (TEGs) are devices capable of transforming heat energy into electricity and vice versa. Although TEGs are known and have been in use for around five decades, they are implemented in only a limited range of applications, mainly extraterrestrial applications. This is due to t...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/17/5970 |
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| author | Gilad Mordechai Guttmann Shmuel Samuha Reuven Gertner Barak Ostraich Shlomo Haroush Yaniv Gelbstein |
| author_facet | Gilad Mordechai Guttmann Shmuel Samuha Reuven Gertner Barak Ostraich Shlomo Haroush Yaniv Gelbstein |
| author_sort | Gilad Mordechai Guttmann |
| collection | DOAJ |
| description | Thermoelectric generators (TEGs) are devices capable of transforming heat energy into electricity and vice versa. Although TEGs are known and have been in use for around five decades, they are implemented in only a limited range of applications, mainly extraterrestrial applications. This is due to their low technical readiness level (TRL) for widespread use, which is only at levels of 3–5 approaching laboratory prototypes. One of the most setbacks in reaching higher TRL is the lack of understanding of the mechanical and thermo-mechanical properties of TE materials. Out of ~105,000 entries about TE materials only ~100 entries deal with mechanical properties, while only 3 deal with thermo-mechanical properties. GeTe-based alloys with varying other elements, forming efficient <i>p</i>-type thermoelectric materials in the 200 ÷ 500 °C temperature range, have been intensively researched since the 1960s and have been successfully applied in practical TEGs. Yet, their temperature-dependent mechanical properties were never reported, preventing the fulfillment of their potential in a wide variety of practical applications. The combined effects of temperature and mechanical compression of GeTe were explored in the current research by implementing novel quantitative crystallographic methods to statistically describe dislocation activity and modification of the micro-texture as inflecting by the testing conditions. It is suggested, through utilizing these methods, that the combined effect of compression and temperature leads to the dissolving of twin boundaries, which increases dislocation mobility and results in a brittle-to-ductile transition at ~0.45 of the homologous temperature. |
| first_indexed | 2024-03-10T01:35:34Z |
| format | Article |
| id | doaj.art-75d8f39db5dd43e4a9b1fbf47d79999e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:35:34Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-75d8f39db5dd43e4a9b1fbf47d79999e2023-11-23T13:33:18ZengMDPI AGMaterials1996-19442022-08-011517597010.3390/ma15175970The Thermo-Mechanical Response of GeTe under CompressionGilad Mordechai Guttmann0Shmuel Samuha1Reuven Gertner2Barak Ostraich3Shlomo Haroush4Yaniv Gelbstein5Department of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 8410501, IsraelNuclear Research Center Negev, P.O. Box 9001, Beer-Sheva 8419001, IsraelNuclear Research Center Negev, P.O. Box 9001, Beer-Sheva 8419001, IsraelNuclear Research Center Negev, P.O. Box 9001, Beer-Sheva 8419001, IsraelNuclear Research Center Negev, P.O. Box 9001, Beer-Sheva 8419001, IsraelDepartment of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 8410501, IsraelThermoelectric generators (TEGs) are devices capable of transforming heat energy into electricity and vice versa. Although TEGs are known and have been in use for around five decades, they are implemented in only a limited range of applications, mainly extraterrestrial applications. This is due to their low technical readiness level (TRL) for widespread use, which is only at levels of 3–5 approaching laboratory prototypes. One of the most setbacks in reaching higher TRL is the lack of understanding of the mechanical and thermo-mechanical properties of TE materials. Out of ~105,000 entries about TE materials only ~100 entries deal with mechanical properties, while only 3 deal with thermo-mechanical properties. GeTe-based alloys with varying other elements, forming efficient <i>p</i>-type thermoelectric materials in the 200 ÷ 500 °C temperature range, have been intensively researched since the 1960s and have been successfully applied in practical TEGs. Yet, their temperature-dependent mechanical properties were never reported, preventing the fulfillment of their potential in a wide variety of practical applications. The combined effects of temperature and mechanical compression of GeTe were explored in the current research by implementing novel quantitative crystallographic methods to statistically describe dislocation activity and modification of the micro-texture as inflecting by the testing conditions. It is suggested, through utilizing these methods, that the combined effect of compression and temperature leads to the dissolving of twin boundaries, which increases dislocation mobility and results in a brittle-to-ductile transition at ~0.45 of the homologous temperature.https://www.mdpi.com/1996-1944/15/17/5970GeTecompressionmechanical propertiescrystallographyEBSDgeometrically necessary dislocations |
| spellingShingle | Gilad Mordechai Guttmann Shmuel Samuha Reuven Gertner Barak Ostraich Shlomo Haroush Yaniv Gelbstein The Thermo-Mechanical Response of GeTe under Compression Materials GeTe compression mechanical properties crystallography EBSD geometrically necessary dislocations |
| title | The Thermo-Mechanical Response of GeTe under Compression |
| title_full | The Thermo-Mechanical Response of GeTe under Compression |
| title_fullStr | The Thermo-Mechanical Response of GeTe under Compression |
| title_full_unstemmed | The Thermo-Mechanical Response of GeTe under Compression |
| title_short | The Thermo-Mechanical Response of GeTe under Compression |
| title_sort | thermo mechanical response of gete under compression |
| topic | GeTe compression mechanical properties crystallography EBSD geometrically necessary dislocations |
| url | https://www.mdpi.com/1996-1944/15/17/5970 |
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