1. Hexagonal Boron Nitride
Raman Spectroscopy study and NanoIndentor study on the effects of high pressures on
Hexagonal Boron Nitride
Timothy M. Banks

2. Experiment
Purpose
Background
Techniques
Results

3. Purpose Super-hard material Determine Raman Scattering effects
Determine hardness

4. Diamond Anvil Cell
Applications
Varieties
Alabama Cell

5. Diamond Anvil Cell

6. Raman Spectroscopy
Raman Effect
C.V. Raman
Rayleigh scattering
Photons

8. Hexagonal Boron Nitride
“White Graphite”
First discovered in 19th century
Chemical composition

9. Hexagonal Boron Nitride
APPLICATIONS
Industrial
Cosmetic
Chemical

10. Hexagonal Boron Nitride
SEM-image (secondary electron image) of hexagonal boron nitride.

11. Experimental Procedure
Prepare Gasket
Pressure Measurement
P=380.8 [ ]5-1)GPa
Raman Spectra
NanoIndenter XP  0

12. Pressures Reached
8 GPa (L1)
42 GPa (L2)
29 GPa (L3)
13 GPa (L4)

13. Pressure vs. Photon Energy

14. Results
Raman Spectra
Spring Constant
NanoIndentor Results

15. Spring Constant vs. Pressure

16. Summary & Conclusions
Raman Scattering
Hardness

17. Acknowledgements
It is with great pride and gratitude that I would like to thank the following for their guidance and support: Dr. Yogesh K. Vohra, Nenad Velisavljevic, Reed Patterson, Ginger Hughes, UAB Physics Department, and the National Science Foundation.

18. The End Thank You