slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Updates of Iowa State University PowerPoint Presentation
Download Presentation
Updates of Iowa State University

Loading in 2 Seconds...

play fullscreen
1 / 6

Updates of Iowa State University - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

Updates of Iowa State University . S. Dumpala , S. Broderick, A. J. Peralta and K. Rajan Mar – 11 - 2013 . Summary of Previous Al oxidation results. Oxidation of Aluminum at 450 C, 2.5 x 10- 3 Torr for 10 min.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Updates of Iowa State University' - ataret


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Updates of Iowa State University

S. Dumpala, S. Broderick, A. J. Peralta and K. Rajan

Mar – 11 - 2013

slide2

Summary of Previous Al oxidation results

  • Oxidation of Aluminum at 450 C, 2.5 x 10-3Torr for 10 min.
  • Interface shown from reaction of O and Al. Identify Al2O3 as bulk phase of gas-solid reaction
  • Use of AP results for experimental inputs into ReaxFFsimulations

Diffusion Profiles - APT

slide3

Present - Al oxidation results

Environmental Chamber- APT

  • Heater stage preheated to 500 C (sample T-300 C)
  • Pressure – 7x 10 -5 torrfor 5 min
  • APT – Laser run at 1 nj
  • Different oxygen species are detected as observed earlier
slide4

Study of Interfaces

Al- Iso surface 95.23%

Diffusion Profiles - APT

Al

O

  • Oxidation forming – AlO phase compared to stoichiometric Al2O3 phase observed earlier
  • Different oxide species observed
slide5

Effect of Temperature

723 K

573 K

Bulk Al2O3 phase

Bulk Al phase

Bulk Al phase

AlO

O

Al

  • XPS, HRTEM also reported formation of limiting thickness Al-deficient phase than Al2O3 at <573 K [1]
  • The observed formation of stoichiometric Al2O3 phase at higher temperature is consistent with ref [1] for temperature 773 K
  • The thickness shown to increase with increasing temperature [1] also consistent with APT results.
  • [1] Jeurgesn L.P.H., et. al., J. App. Phys. 2002, 92, 1649
slide6

Future

  • More experiments as function of temperature and pressures
  • Study of oxidation mechanism
  • Testing the Si tips from Maryland