Guardado en:
| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2411.10738 |
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- 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.