Anomalous thermal and elastic properties of an epitaxial NiTi film exhibiting R-phase
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866914575591407616 |
|---|---|
| author | Repček, Kristýna Grabec, Tomáš Mareš, David Stoklasová, Pavla Sedlák, Petr Kušnír, Jakub Veřtát, Petr Heczko, Oleg Fähler, Sebastian Lünser, Klara Seiner, H. |
| author_facet | Repček, Kristýna Grabec, Tomáš Mareš, David Stoklasová, Pavla Sedlák, Petr Kušnír, Jakub Veřtát, Petr Heczko, Oleg Fähler, Sebastian Lünser, Klara Seiner, H. |
| contents | Shape memory alloys like NiTi are at the core of emerging thermal management applications, including elastocaloric refrigeration, thermoelastic harvesting, and latent heat storage. Most of these applications benefit from a small scale due to the accelerated heat exchange, but obtaining precise functional properties of films is challenging. Here we demonstrate that transient grating spectroscopy (TGS) enables characterization of elastic coefficients and thermal diffusivity of a 3 $μ$m thick epitaxial NiTi film during a thermally induced phase transformation. The in-situ measurement of a complete austenite$\rightarrow$R-phase$\rightarrow$martensite$\rightarrow$austenite temperature cycle reveals that the elastic properties exhibit a crossover of the shear moduli (from $c^\prime < c_{44}$ in austenite to $c^\prime > c_{44}$ in martensite) and that the thermal diffusivity changes by 450 $\%$ between the R-phase and austenite. This dramatic change, together with the absence of hysteresis between the R-phase and austenite, makes NiTi a promising material candidate for thermal switches. The results indicate that the change in thermal diffusivity originates from an anomalous heat capacity of the R-phase. Furthermore, our TGS study provides temperature-dependent thermal and elastic properties required for simulating thermal management microsystems using this material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_17553 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anomalous thermal and elastic properties of an epitaxial NiTi film exhibiting R-phase Repček, Kristýna Grabec, Tomáš Mareš, David Stoklasová, Pavla Sedlák, Petr Kušnír, Jakub Veřtát, Petr Heczko, Oleg Fähler, Sebastian Lünser, Klara Seiner, H. Materials Science Shape memory alloys like NiTi are at the core of emerging thermal management applications, including elastocaloric refrigeration, thermoelastic harvesting, and latent heat storage. Most of these applications benefit from a small scale due to the accelerated heat exchange, but obtaining precise functional properties of films is challenging. Here we demonstrate that transient grating spectroscopy (TGS) enables characterization of elastic coefficients and thermal diffusivity of a 3 $μ$m thick epitaxial NiTi film during a thermally induced phase transformation. The in-situ measurement of a complete austenite$\rightarrow$R-phase$\rightarrow$martensite$\rightarrow$austenite temperature cycle reveals that the elastic properties exhibit a crossover of the shear moduli (from $c^\prime < c_{44}$ in austenite to $c^\prime > c_{44}$ in martensite) and that the thermal diffusivity changes by 450 $\%$ between the R-phase and austenite. This dramatic change, together with the absence of hysteresis between the R-phase and austenite, makes NiTi a promising material candidate for thermal switches. The results indicate that the change in thermal diffusivity originates from an anomalous heat capacity of the R-phase. Furthermore, our TGS study provides temperature-dependent thermal and elastic properties required for simulating thermal management microsystems using this material. |
| title | Anomalous thermal and elastic properties of an epitaxial NiTi film exhibiting R-phase |
| topic | Materials Science |
| url | https://arxiv.org/abs/2605.17553 |