slide1
Download
Skip this Video
Download Presentation
Humberto Foronda

Loading in 2 Seconds...

play fullscreen
1 / 16

Humberto Foronda - PowerPoint PPT Presentation


  • 121 Views
  • Uploaded on

IRES 2011: Undergraduate Research in Leoben , Austria. Humberto Foronda. Materials Science and Engineering, University of Florida, Gainesville, FL, USA. Support : NSF OISE-0402066, DMR-0746902, and OISE-0755170, Army Research Office W911NF-09-1-0435. Leoben,Austria. Population: 25,227

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 ' Humberto Foronda' - hallie


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

IRES 2011: Undergraduate Research in Leoben, Austria

HumbertoForonda

Materials Science and Engineering, University of Florida, Gainesville, FL, USA

Support: NSF OISE-0402066, DMR-0746902, and OISE-0755170, Army Research Office W911NF-09-1-0435.

leoben austria
Leoben,Austria

Population: 25,227

Official Language: German

montanuniversit t leoben
Montanuniversität Leoben

Specializes in Mining, Metallurgy, and Materials

Number of Students: 2,764

life at the institute
Life at the Institute
  • Insititut für Struktur und Funktionskeramik
research
Research
  • Investigation of Sodium Bismuth Titanate with Iron and Manganese at different percentages with an electron microprobe
  • Raman Spectroscopy on various compositions of NBT-BT processed at the University of Florida and Darmstadt
  • Investigation of crack propagation in Vickers Indentations on conditioned Lead Zirconate Titanate
nbt fe
NBT-Fe
  • Electron microprobe image (left). Same image with focus on Fe(right)
  • 0.5% noticeably homogenous throughout sample
  • 2.0% forms Fe-rich deposits(clusters) around pores, noticeably inhomogeneous

NBT-Fe 0.5%

Fe

Grain Pullout

NBT-Fe 2.0%

Fe

clusters

clusters

Grain Pullout

Grain Pullout

nbt mn
NBT-Mn

Mn

  • Electron microprobe image(left).Same image with focus on Mn (right)
  • 0.5% noticeably homogenous throughout sample
  • 2.0% has Mn-rich deposits, noticeably inhomogenous

NBT-Mn 0.5%

Grain Pullout

NBT-Mn 2.0%

Mn

Grain Pullout

clusters

slide9

Magnified Images of 2% Mn-NBT

  • Original image of magnified surface of NBT-Mn 2%
  • electron microprobe conducts search on Mn, cluster of Mn, inhomogeneous
  • Electron microprobe conducts search on Na, cluster of Na,
  • Electron microprobe conducts search on Bi, reduction in bismuth.

Mn

cluster

Grain pullout

Grain pullout

Na

Bi

Grain pullout

Grain pullout

cluster

Reduction in Bi

raman spectroscopy
Raman Spectroscopy
  • Examines vibrational modes in a sample
  • Sample was measured with a source of monochromatic light, recording only the inelastically scattered photons
  • Incident Photon can be absorbed by molecule (Stokes Scattering)
  • Molecule can lose energy (Anti-Stokes Scattering)
raman for nbt bt
Raman for NBT-BT
  • Raman Spectra is plotted raw data.
  • Analyzing data through peak fitting helped us find transition temperatures
  • According to literature on NBT-based materials, the mode at 620 cm-1 represents vibrations of the BO6 octahedra occurring along the c-axis, showing a change in the symmetry or tilting of the octahedra
  • expect to see it as an anomaly in the peak position of the mode at 620 cm-1
indentations
Indentations

E-Field

Poled PZT sample with Vicker’s Indentation (Anisotropic)

Cracks parallel to E-field shorter due to energy lost when domains switched from perpendicular to parallel.

  • Life expectancy of poled samples were investigated.
  • Repeated crack length measurements which were conducted two years ago in order to compare and discover a potential aging effect.
recorded measurement
Recorded Measurement
  • Poled at 2kV/mm, heated to 150 celsius
  • Poled at 2kV/mm, heated to 150 celsius, 50 MPa load
  • Poled at 2kV/mm, heated to 75 celsius, 50 MPa load
future work
Future Work
  • Prepare NBT results from Austria for publication
  • Continue work on NBT-BT temperature dependant measurements
  • Potentially continue measurements of electromechanical coupling factor
ad