Raman Spectroscopy study and Nano Indentor study on

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

Experiment • Purpose • Background • Techniques • Results

Purpose • Super-hard material • Determine Raman Scattering effects • Determine hardness

Diamond Anvil Cell • Applications • Varieties • Alabama Cell

Diamond Anvil Cell

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

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

Hexagonal Boron Nitride • APPLICATIONS – Industrial – Cosmetic – Chemical

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

Experimental Procedure • Prepare Gasket • Pressure Measurement ØP=380. 8 [ ]5 -1)GPa 0 • Raman Spectra • Nano. Indenter XP

Pressures Reached • 8 GPa (L 1) • 42 GPa (L 2) • 29 GPa (L 3) • 13 GPa (L 4)

Pressure vs. Photon Energy

Results • Raman Spectra • Spring Constant • Nano. Indentor Results

Spring Constant vs. Pressure

Summary & Conclusions • Raman Scattering • Hardness

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.

The End Thank You