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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

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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


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


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