A5043695976- Geological and Geochemical Analysis
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Hydrocarbon exploration and reservoir analysis
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Advanced Materials Characterization Techniques
- Aluminum Alloy Microstructure Properties
- Aluminum Alloys Composites Properties
- Radioactive element chemistry and processing
- Luminescence Properties of Advanced Materials
- Advanced Electron Microscopy Techniques and Applications
- Mineralogy and Gemology Studies
- Ion-surface interactions and analysis
- Radioactivity and Radon Measurements
- Photocathodes and Microchannel Plates
- Metal Extraction and Bioleaching
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Geological formations and processes
- Nuclear Physics and Applications
- Crystal Structures and Properties
- Spectroscopy and Chemometric Analyses
- Corrosion Behavior and Inhibition
- Machine Learning in Materials Science
Commonwealth Scientific and Industrial Research Organisation
2015-2024
Mineral Resources
2015-2024
Australian Resources Research Centre
2016-2024
Monash University
2022
CSIRO Manufacturing
2009-2014
RMIT University
2005
Abstract This article concerns application of cathodoluminescence (CL) spectroscopy to volcanic quartz and its utility in assessing variation trace quantities Ti within individual crystals. CL provides useful details intragrain compositional variability structure but generally limited quantitative information on element abundances. Microbeam analysis can provide such is time-consuming costly, particularly if large numbers analyses are required. To maximize advantages both approaches, natural...
Abstract Sheet AA2024‐T3 is probably one of the most studied aluminium alloys in corrosion field, because, with copper as an alloying addition, it corrosion‐prone alloys. This paper reports new findings on composition and distribution intermetallic (IM) particles through examination over 80 000 compositional domains nearly 18 IM particles. work was achieved by using electron microprobe to map out 2 × mm at a step size 400 nm. study revealed that individual can vary considerably from...
Abstract Electron and proton microprobes, along with electron backscatter diffraction (EBSD) analysis were used to study the microstructure of contemporary Al–Cu–Li alloy AA2099-T8. In probe microanalysis, wavelength energy dispersive X-ray spectrometry in parallel soft emission spectroscopy (SXES) characterize The microprobe was able identify five unique compositions for constituent intermetallic (IM) particles containing combinations Al, Cu, Fe, Mn, Zn. A sixth IM type found be rich Ti B...
New geological, bulk chemical and mineralogical (QEMSCAN FEG-EPMA) data are presented for albitite-type uranium deposits of the Mount Isa region Queensland, Australia. Early albitisation interbedded metabasalt metasiltstone predated intense deformation along D2 high strain (mylonite) zones. The early sodic alteration paragenetic stage includes albite, riebeckite, aegirine, apatite, zircon magnetite. This was overprinted by potassic microveins, containing K-feldspar, biotite, coffinite,...
Ureilite meteorites are arguably our only large suite of samples from the mantle a dwarf planet and typically contain greater abundances diamond than any known rock. Some also lonsdaleite, which may be harder diamond. Here, we use electron microscopy to map relative distribution coexisting diamond, graphite in ureilites. These maps show that lonsdaleite tends occur as polycrystalline grains, sometimes with distinctive fold morphologies, partially replaced by + rims cross-cutting veins....
Alluvial mineral sands rank among the most complex subjects for characterization due to diverse range of minerals present in sediments, which may collectively contain a daunting number elements (>20) major or minor concentrations (>1 wt%). To comprehensively characterize phase abundance and chemistry these specimens, method was developed using hyperspectral x-ray cathodoluminescence mapping an electron probe microanalyser (EPMA), coupled with automated cluster analysis quantitative...
The measurement of near-infrared (NIR) cathodoluminescence (CL) with sufficient sensitivity to allow full spectral mapping has been investigated through the application optimized grating spectrometers that ultraviolet (UV), visible, and NIR CL spectra be measured simultaneously. Two optical have integrated into an electron microprobe, allowing simultaneous collection hyperspectral (UV-NIR), characteristic X-rays, signals. Combined collected from two natural apatite (Ca5[PO4]3[OH,F]) samples...
Electron backscatter diffraction (EBSD) and scanning electron microscopy were combined to study the effect of residual defect density on corrosion initiation in aluminium alloy AA2024‐T3. EBSD was used determine level misorientation (MO), from pixel pixel, within individual grains. The MO can be determined with respect either average orientation angle grain or surrounding pixels (in this instance, a matrix 7 × has been applied). Herein, MO, using pixels, as means for assessing grain. It...
An Al–Cu–Li aerospace alloy has been investigated to determine the order in which corrosion at different types of sites occurs AA2099-T83. Specifically, sequence galvanic attack on intermetallic (IM) particles and other AA2099-T83 was determined as a function time, 0.1 M NaCl, through use scanning electron microscopy backscatter diffraction characterization techniques. The earliest occurred isolated grains grain boundaries Li-containing dispersoids. Similarly, some constituent IM showed...
The effect of electron beam induced carbon contamination on the corrosion behavior aluminum alloy 2024-T3 (AA2024-T3) has been investigated using immersion and polarization-type tests. For test, was deposited a polished surface AA2024‑T3 in form concentric squares increasing thickness toward center. sample then corroded 0.1 M NaCl for 80 hrs at room temperature subsequently examined scanning microscope (SEM) to determine how matrix intermetallic phases behaved under layer. Results indicated...
Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – 7,
Hyperspectral cathodoluminescence mapping is used to examine a carbonado diamond. The hyperspectral dataset examined using data clustering algorithm interpret the range of spectral shapes present within dataset, which are related defects structure response from this particular diamond can be attributed small number defect types: N-V0, N2V, N3V, 3.188 eV line, radiation damage, and two broad luminescence bands. Both N2V require high-temperature annealing, has implications for interpreting...
Samples from the sphalerite-dominated zone of a seafloor massive sulfide chimney, Satanic Mills Chimney PACMANUS hydrothermal field, have been investigated to determine internal macrostructure and microstructure this zone, phases present, distribution metals. A combination electron probe microanalysis, backscattered diffraction, x-ray diffraction has used. At macroscale, chimney wall is heavily porous comprised primarily sphalerite, enclosing minor chalcopyrite, pyrite, wurtzite. Pb–As...
Abstract The origin of the common blue 450 nm (2.8 eV) cathodoluminescence (CL) emission in natural and synthetic quartz has been investigated using a combination CL microscopy spectroscopy, electron paramagnetic resonance (EPR) trace-element analysis by micro-probe as well inductively coupled plasma-mass spectrometry (ICP-MS). study shows that appearance ~450 band can be attributed to two different defects quartz. First, transient luminescence explained structural oxygen deficient model...
High-arsenic copper flotation concentrates, in which the major arsenic-bearing mineral was tennantite, were leached with an alkaline sulphide system. At a pulp density of 5 wt% solids 100–150 g/L Na2S and 50 NaOH, over 91 As dissolved within 2 h at 100°C. From concentrates containing 3.4–4.9 As, leach residues <0.5 obtained making them suitable as smelter feed without penalty for arsenic. Copper dissolution ranged from 16 to 22 Cu, significant amounts calcium, iron sulphur also dissolved. In...
This paper investigates thin films of titanium aluminium nitride grown using a stoichiometric metallic cathode in cathodic arc vapour deposition system with plasma immersion ion implantation. The effect various conditions on the stress, microstructure and composition are evaluated. In general, were found to be both nitrogen rich. application voltages 2 kV greater was dramatically reduce stress films. reduction less pronounced at lower flow rates due cubic high exhibited preferred orientation...
Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – 7,