Hexagonal Boron Nitride

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Presentation transcript:

Hexagonal Boron Nitride Raman Spectroscopy study and NanoIndentor 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 19th 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 P=380.8 [ ]5-1)GPa Raman Spectra NanoIndenter XP  0

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

Pressure vs. Photon Energy

Results Raman Spectra Spring Constant NanoIndentor 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