A5010342237- Advanced Materials Characterization Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Transition Metal Oxide Nanomaterials
- Metal Alloys Wear and Properties
- Fusion materials and technologies
- Diamond and Carbon-based Materials Research
- Gas Sensing Nanomaterials and Sensors
- High Entropy Alloys Studies
- Copper-based nanomaterials and applications
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Force Microscopy Techniques and Applications
- Nanoporous metals and alloys
- Ga2O3 and related materials
- Optical Polarization and Ellipsometry
- Nuclear Physics and Applications
- Analytical chemistry methods development
- Optical Imaging and Spectroscopy Techniques
- Catalytic Processes in Materials Science
- Anodic Oxide Films and Nanostructures
- Electronic and Structural Properties of Oxides
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Random lasers and scattering media
- nanoparticles nucleation surface interactions
The University of Sydney
2021-2025
University of Newcastle Australia
2015-2021
Callaghan Innovation
2021
The CAMECA Invizo 6000 atom probe microscope uses ion optics that differ significantly from the local electrode (LEAP). It dual antiparallel deep ultraviolet lasers, a flat counter electrode, and series of accelerating decelerating lenses to increase field-of-view specimen without reducing mass resolving power. In this work we characterise performance using three material case studies: model Al-Mg-Si alloy, commercially-available Ni-based superalloy, Zr combination air vacuum-transfer...
Abstract Kingham [(1982). The post-ionization of field evaporated ions: A theoretical explanation multiple charge states. Surf Sci116(2), 273–301] provided equations for the probability observing higher states in atom probe tomography (APT) experiments. These “Kingham curves” have wide application APT, but cannot be analytically transformed to provide electric terms easily measured state ratio (CSR). Here we a numerical scheme calculation curves and variation with CSR. We find CSR is well...
Deep cryogenic treatment (DCT) has arisen as a promising green technology to modify the properties of metallic materials. Here we present substantial (55%) improvement wear resistance an Al-Mg-Si alloy using DCT without any deterioration other mechanical properties. This is attributed slight hardness increase resulting from multiscale microstructural modifications. modifies morphology dispersoids well organization and β'' precipitates that their fraction (25%) at expense β' precipitates....
Abstract Ferroelectric materials contain regions of uniform electrical polarization, known as domains. In Pb‐based relaxor‐ferroelectric perovskite oxides, these domains can be small a few nanometers, making standardized analysis domain sizes challenging. Here, we present two methods for the quantitative from transmission electron micrographs. One method uses statistical multiple line profiles, and other analyses intensity streaks in Fourier transform image. The techniques provide equivalent...
Abstract Atom probe tomography can be used to measure the excess of solute chemical species at internal interfaces, but common protocols do not usually consider compositional uncertainty (usually dilute) solute. Here, general models are derived for composition profile a segregated interface between two grains or phases. This model is fit experimental data, with cumulative included in calculation interfacial excess. It shown that relative large dilute solutes, even when segregation obvious...
The tungsten bronzes are non-stoichiometric transition metal oxides of the form MxWO3, where 0 ≤ x 1, and M is a dopant ion, most commonly an alkali metal.In this work, sodium (NaxWO3) investigated as materials for plasmonic applications.The were fabricated with solid state reaction, dielectric function calculated using density functional theory (DFT) nanoparticle responses boundary element method (BEM).The results compared to Au Ag, widely used in applications.It was shown that > 0.5,...
Abstract Many of the CM carbonaceous chondrites are regolith breccias and so should have abundant evidence for collisional processing. The constituent clasts these fragmental rocks frequently display compactional petrofabrics; yet, olivine microstructures show that most CMs unshocked. To better understand reasons this contradiction, we sought other hypervelocity impact processing using Cold Bokkeveld meteorite. We find breccia contains rare particles vesicular shock melt close in chemical...
The study investigates the effect of deep cryogenic treatment (DCT) on a high-alloyed ferrous alloy (HAFA) and its effectiveness carbide evolution chemical shifts alloying elements. With ex-situ in-situ observations ranging from microscopic to nanoscopic level, we uncover atomistic mechanism by which DCT affects precipitation, resulting in 50% increase volume fraction. Synchrotron-based scanning photoelectron microscopy provides insight into agglomeration carbon during exposure DCT. We find...
Conventional electrodes and electrocatalysts possess complex compositional structural motifs that impact their overall electrochemical activity. These range from defects crystal orientation on the electrode surface to layers composites with other components, such as binders. Therefore, it is vital identify how these individual alter activity of electrode. Scanning cell microscopy (SECCM) a powerful tool has been developed for investigating properties structures. An example Zn–Al alloys,...
In this study we investigate the effect of deep cryogenic treatment (DCT) on a high-alloyed ferrous alloy (HAFA) to understand resulting chemical and physical changes HAFA's microstructure properties. Using multiple materials analysis techniques, uncover fundamental HAFA with DCT, link in material properties microstructure. The increased carbide nucleation DCT is linked greater solute mobility from modified stress state bonding solutes matrix. turn provides possibility prior formation points...
In order to advance plasmon-based technologies, new materials with low damping losses and high chemical stability are needed. this letter, we report the bulk scale fabrication of sodium tungsten bronze (Na x WO3) nanoparticles Na content (x ≤ 0.83) using a furnace-assisted method. Phase purity morphology is confirmed x-ray diffraction scanning electron microscopy. Plasmon responses characterized spectrophotometry spatially-resolved energy-loss spectroscopy (EELS) in transmission microscope....
(Kingham 1982) provided equations for the probability of observing higher charge states in atom probe tomography (APT) experiments. These "Kingham curves" have wide application APT, but cannot be analytically transformed to provide electric field terms easily-measured state ratio (CSR). Here we a numerical scheme calculation Kingham curves and variation with CSR. We find CSR is well-described by simple two or three-parameter equation, model accurate most elements states. The applied...
Abstract There has been an increasing interest in atom probe tomography (APT) to characterize hydrated and biological materials. A major benefit of APT compared microscopy techniques more commonly used biology is its combination outstanding three-dimensional (3D) spatial resolution mass sensitivity. already successfully biominerals, revealing key structural information at the atomic scale, however there are many challenges inherent analysis soft New preparation protocols, often involving...
Atom probe tomography can be used to measure the excess of solute chemical species at internal interfaces, but common protocols do not usually consider compositional uncertainty (usually dilute) solute. Here, general models are derived for composition profile a segregated interface between two grains or phases. This model is fit experimental data, with cumulative included in calculation interfacial excess. It shown that relative large dilute solutes, even when segregation obvious...