Structural origins of ultra-low glass-like thermal conductivity in AgGaGe3Se8
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866929593665978368 |
|---|---|
| author | Thorup, Peter Skjøtt Stubkjær, Rasmus Baden Huynh, Kim-Khuong Ventrapati, Pavankumar Vosegaard, Emilie Skytte Iversen, Bo Brummerstedt |
| author_facet | Thorup, Peter Skjøtt Stubkjær, Rasmus Baden Huynh, Kim-Khuong Ventrapati, Pavankumar Vosegaard, Emilie Skytte Iversen, Bo Brummerstedt |
| contents | Materials with a low thermal conductivity are important for a variety of applications such as thermal barrier coatings and thermoelectrics, and understanding the underlying mechanisms of low heat transport, and relating them to structural features, remains a central goal within material science. Here, we report on the ultra-low thermal conductivity of the quarternary silver chalcogenide AgGaGe3Se8 with a remarkable value of only 0.2 Wm-1K-1 at room temperature, and an unusual glass-like thermal behavior from 2 K to 700 K. The ultra-low thermal conductivity is linked to a disordered nature of Ag in the structure, displaying extremely large Ag atomic displacement parameters obtained from multi-temperature synchrotron powder X-ray scattering measurements, and Ag ionic conductivity at elevated temperatures. Additionally, signs of structural anharmonicity and soft bonding are evident from a low temperature Boson peak in the heat capacity and a low Debye temperature of 147 K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_10738 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structural origins of ultra-low glass-like thermal conductivity in AgGaGe3Se8 Thorup, Peter Skjøtt Stubkjær, Rasmus Baden Huynh, Kim-Khuong Ventrapati, Pavankumar Vosegaard, Emilie Skytte Iversen, Bo Brummerstedt Materials Science Materials with a low thermal conductivity are important for a variety of applications such as thermal barrier coatings and thermoelectrics, and understanding the underlying mechanisms of low heat transport, and relating them to structural features, remains a central goal within material science. Here, we report on the ultra-low thermal conductivity of the quarternary silver chalcogenide AgGaGe3Se8 with a remarkable value of only 0.2 Wm-1K-1 at room temperature, and an unusual glass-like thermal behavior from 2 K to 700 K. The ultra-low thermal conductivity is linked to a disordered nature of Ag in the structure, displaying extremely large Ag atomic displacement parameters obtained from multi-temperature synchrotron powder X-ray scattering measurements, and Ag ionic conductivity at elevated temperatures. Additionally, signs of structural anharmonicity and soft bonding are evident from a low temperature Boson peak in the heat capacity and a low Debye temperature of 147 K. |
| title | Structural origins of ultra-low glass-like thermal conductivity in AgGaGe3Se8 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.10738 |