1 Humberto Foronda Humberto Foronda Materials Science and Engineering, University of Florida, Gainesville, FL, USA IRES 2011: Undergraduate Research IRES 2011: Undergraduate Research in Leoben, Austria in Leoben, Austria Support: NSF OISE-0402066, DMR-0746902, and OISE-0755170, Army Research Office W911NF-09-1-0435.
Humberto Foronda
Feb 02, 2016
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 - PowerPoint PPT Presentation
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Humberto ForondaHumberto Foronda
Materials Science and Engineering, University of Florida, Gainesville, FL, USA
IRES 2011: Undergraduate Research in IRES 2011: Undergraduate Research in Leoben, AustriaLeoben, Austria
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Support: NSF OISE-0402066, DMR-0746902, and OISE-0755170, Army Research Office W911NF-09-1-0435.
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Leoben,Austria
Population: 25,227Official Language: German
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Montanuniversität Leoben
Specializes in Mining, Metallurgy, and MaterialsNumber of Students: 2,764
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Life at the Institute• Insititut für Struktur und Funktionskeramik
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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
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Electron Microprobe
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NBT-FeNBT-Fe 0.5%
NBT-Fe 2.0%
Fe
Feclusters
Grain Pullout
Grain Pullout
•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
clusters
Grain Pullout
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NBT-MnNBT-Mn 0.5%
NBT-Mn 2.0%
Mn
Mn
Grain Pullout
Grain Pullout
clusters
•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
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Magnified Images of 2% Mn-NBT
Grain pullout
cluster
cluster
Grain pullout
Mn
Grain pullout
Na
Reduction in Bi
Grain pullout
Bi
• 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.
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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)
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Raman Spectra for NBT-BT
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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
% BT Transition Temp in Darmstadt (Celsius)
Transition Temp in UF (Celsius)
6 205 265
7 225 285
9 225 265
• expect to see it as an anomaly in the peak position of the mode at 620 cm-1
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IndentationsE-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.
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Recorded MeasurementSample Parallel(μm) Normal(μm) Parallel (μm) Normal (μm) Parallel (μm) Normal (μm)PZT_T_P01 Indenation 1 167 276.5 173.4 287.9 166.2 274.6
PZT_T_P01 Indenation 2 159.3 282.6 160.3 292.3 155.9 269.5
PZT_T_P01 Indenation 3 165.3 273.7 161.6 278.3 156.0 272.6
PZT_T_P01 Average 166.2 275.1 165.1 286.2 159.4 272.2
PZT_T_P02 Indenation 1 193 206.3 204.7 225.0 182.13 229.2
PZT_T_P02 Indenation 2 190.8 213.4 185.2 227.6 179.31 231.58
PZT_T_P02 Indenation 3 188 206.8 190.9 227.4 204.63 229.78
PZT_T_P02 Average 190.6 208.8 193.6 226.7 188.69 230.1866667
PZT_T_P03 Indenation 1 173.1 221.2 176.9 252.2 174.18 234.11
PZT_T_P03 Indenation 2 180.8 227.3 182.9 247.7 177.93 240
PZT_T_P03 Indenation 3 180.8 224.5 189.4 244.1 185.62 236.63
PZT_T_P03 Average 178.2 224.3 183.1 248.0 179.24 236.91
Cracked and Measured by Dr. Bermejo in 2009Cracked by Dr. Bermejo but measured by Humberto in 2011Cracked and measured by Humberto in 2011
1. Poled at 2kV/mm, heated to 150 celsius2. Poled at 2kV/mm, heated to 150 celsius, 50 MPa load3. Poled at 2kV/mm, heated to 75 celsius, 50 MPa load
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Recorded Measurements
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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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