Heinz, Sven ; Angel, Emigdio Chavez ; Trapp, Maximilian ; Kleebe, Hans-Joachim ; Jakob, Gerhard (2020)
Phonon bridge effect in superlattices of thermoelectric TiNiSn/HfNiSn with controlled interface intermixing.
In: Nanomaterials, 10 (6)
doi: 10.3390/nano10061239
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
The implementation of thermal barriers in thermoelectric materials improves their power conversion rates effectively. For this purpose, material boundaries are utilized and manipulated to affect phonon transmissivity. Specifically, interface intermixing and topography represents a useful but complex parameter for thermal transport modification. This study investigates epitaxial thin film multilayers, so called superlattices (SL), of TiNiSn/HfNiSn, both with pristine and purposefully deteriorated interfaces. High-resolution transmission electron microscopy and X-ray diffractometry are used to characterize their structural properties in detail. A differential 3w-method probes their thermal resistivity. The thermal resistivity reaches a maximum for an intermediate interface quality and decreases again for higher boundary layer intermixing. For boundaries with the lowest interface quality, the interface thermal resistance is reduced by 23% compared to a pristine SL. While an uptake of diffuse scattering likely explains the initial deterioration of thermal transport, we propose a phonon bridge interpretation for the lowered thermal resistivity of the interfaces beyond a critical intermixing. In this picture, the locally reduced acoustic contrast of the less defined boundary acts as a mediator that promotes phonon transition.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Heinz, Sven ; Angel, Emigdio Chavez ; Trapp, Maximilian ; Kleebe, Hans-Joachim ; Jakob, Gerhard |
| Art des Eintrags: | Bibliographie |
| Titel: | Phonon bridge effect in superlattices of thermoelectric TiNiSn/HfNiSn with controlled interface intermixing |
| Sprache: | Englisch |
| Publikationsjahr: | 2020 |
| Ort: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nanomaterials |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 6 |
| Kollation: | 12 Seiten |
| DOI: | 10.3390/nano10061239 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | The implementation of thermal barriers in thermoelectric materials improves their power conversion rates effectively. For this purpose, material boundaries are utilized and manipulated to affect phonon transmissivity. Specifically, interface intermixing and topography represents a useful but complex parameter for thermal transport modification. This study investigates epitaxial thin film multilayers, so called superlattices (SL), of TiNiSn/HfNiSn, both with pristine and purposefully deteriorated interfaces. High-resolution transmission electron microscopy and X-ray diffractometry are used to characterize their structural properties in detail. A differential 3w-method probes their thermal resistivity. The thermal resistivity reaches a maximum for an intermediate interface quality and decreases again for higher boundary layer intermixing. For boundaries with the lowest interface quality, the interface thermal resistance is reduced by 23% compared to a pristine SL. While an uptake of diffuse scattering likely explains the initial deterioration of thermal transport, we propose a phonon bridge interpretation for the lowered thermal resistivity of the interfaces beyond a critical intermixing. In this picture, the locally reduced acoustic contrast of the less defined boundary acts as a mediator that promotes phonon transition. |
| Freie Schlagworte: | interface, thermal conductivity, superlattice, intermixing, coherent phonon, roughness, 3 omega, 3 omega method, magnetron sputtering, half-Heusler, thermoelectric, thin film, TiNiSn, HfNiSn, thermal boundary resistance |
| Zusätzliche Informationen: | This article belongs to the Special Issue Thermal Transport in Nanostructures and Nanomaterials |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft |
| Hinterlegungsdatum: | 16 Jan 2024 07:20 |
| Letzte Änderung: | 16 Jan 2024 07:20 |
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Phonon Bridge Effect in Superlattices of Thermoelectric TiNiSn/HfNiSn With Controlled Interface Intermixing. (deposited 15 Jan 2024 14:00)
- Phonon bridge effect in superlattices of thermoelectric TiNiSn/HfNiSn with controlled interface intermixing. (deposited 16 Jan 2024 07:20) [Gegenwärtig angezeigt]
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