Accounting for the length-scale dependence of thermal diffusivity in 3C-SiC measured with transient thermal gratings
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| author | Vasudeva, Keshav Huberman, Samuel Wylie, Angus P. C. Rae, Maxwell Demiane, Joey Haibeh, Jamal A. Botica-Artalejo, Elena Woller, Kevin B. Short, Michael P. Ferry, Sara E. |
| author_facet | Vasudeva, Keshav Huberman, Samuel Wylie, Angus P. C. Rae, Maxwell Demiane, Joey Haibeh, Jamal A. Botica-Artalejo, Elena Woller, Kevin B. Short, Michael P. Ferry, Sara E. |
| contents | Pump-probe optical methods like transient grating spectroscopy (TGS) enable rapid, nondestructive thermoelastic property measurements. But, in phonon-dominated ceramics, they can underpredict bulk thermal diffusivity when long mean free path (MFP) phonons do not equilibrate over experimental length scales. We combine in situ TGS with Si4+ ion irradiation of CVD 3C-SiC (300 and 550C, 0.5-1 dpa) and density functional theory informed Boltzmann transport equation solutions to understand the origins of this offset. We show how the discrepancy between laser flash analysis (LFA) and TGS-measured thermal diffusivity varies with grain-boundary density, temperature, and defect concentration. We introduce a dimensionless suppression factor that accounts for this discrepancy and demonstrate its utility by using it to show an agreement between the thermal defect resistance of neutron irradiated 3C-SiC (measured using LFA) and ion irradiated 3C-SiC (measured using TGS). This theory-informed experimental framework enables quantitative, in situ tracking of ion irradiation damage induced thermal transport degradation in ceramics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_23247 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Accounting for the length-scale dependence of thermal diffusivity in 3C-SiC measured with transient thermal gratings Vasudeva, Keshav Huberman, Samuel Wylie, Angus P. C. Rae, Maxwell Demiane, Joey Haibeh, Jamal A. Botica-Artalejo, Elena Woller, Kevin B. Short, Michael P. Ferry, Sara E. Materials Science Pump-probe optical methods like transient grating spectroscopy (TGS) enable rapid, nondestructive thermoelastic property measurements. But, in phonon-dominated ceramics, they can underpredict bulk thermal diffusivity when long mean free path (MFP) phonons do not equilibrate over experimental length scales. We combine in situ TGS with Si4+ ion irradiation of CVD 3C-SiC (300 and 550C, 0.5-1 dpa) and density functional theory informed Boltzmann transport equation solutions to understand the origins of this offset. We show how the discrepancy between laser flash analysis (LFA) and TGS-measured thermal diffusivity varies with grain-boundary density, temperature, and defect concentration. We introduce a dimensionless suppression factor that accounts for this discrepancy and demonstrate its utility by using it to show an agreement between the thermal defect resistance of neutron irradiated 3C-SiC (measured using LFA) and ion irradiated 3C-SiC (measured using TGS). This theory-informed experimental framework enables quantitative, in situ tracking of ion irradiation damage induced thermal transport degradation in ceramics. |
| title | Accounting for the length-scale dependence of thermal diffusivity in 3C-SiC measured with transient thermal gratings |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.23247 |