| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
Insight into the Impact of Irradiation on Vibrational Properties of AlN Using Raman Spectroscopy |
| Author(s) |
Saqeeb Adnan, Yuzhou Wang, Aleksandr Chernatynskiy, Marat Khafizov |
| On-Site Speaker (Planned) |
Saqeeb Adnan |
| Abstract Scope |
We analyze utility of Raman spectroscopy to characterize displacement damage in ceramics. Wide optical bandgap and piezoelectric properties of aluminum nitride (AlN) make it an attractive candidate for sensor applications in radiation environments. Owing to its radiation resistance it has been chosen as a model system. Epitaxial AlN grown on sapphire substrate were placed against a boron nitride plate and irradiated to a fluence of 7.3x1017 n/cm2 in OSU nuclear research reactor. Transmutation products resulting from 10B(n,α)7Li reactions are expected to produce the most damage. Raman spectroscopy was used to determine the effect of irradiation damage on vibrational properties of AlN across alpha-particle impacted region. A peak shift and broadening in the primary Raman E2high and A1 (LO) mode peaks were observed and are attributed to disorder induced by generated point defects. Additionally, the influence of various point defects on vibrational and elastic properties are analyzed using atomistic level simulations. |