Timothy M. Banks

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Timothy M. Banks

• Raman Spectroscopy study and NanoIndentor study
  on the effects of high pressures on
• Hexagonal Boron Nitride

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Experiment

• Purpose
• Background
• Techniques
• Results

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Purpose

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

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Diamond Anvil Cell

• Applications
• Varieties
• Alabama Cell

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Diamond Anvil Cell
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Raman Spectroscopy

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

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Hexagonal Boron Nitride

• White Graphite
• First discovered in 19th century
• Chemical composition

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Hexagonal Boron Nitride

• APPLICATIONS
• Industrial
• Cosmetic
• Chemical

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

• Prepare Gasket
• Pressure Measurement
• P380.8 5-1)GPa
• Raman Spectra
• NanoIndenter XP

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Pressures Reached

• 8 GPa (L1)
• 42 GPa (L2)
• 29 GPa (L3)
• 13 GPa (L4)

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Pressure vs. Photon Energy
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Results

• Raman Spectra
• Spring Constant
• NanoIndentor Results

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Spring Constant vs. Pressure
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Summary Conclusions

• Raman Scattering
• Hardness

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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.

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The EndThank You