A5050054160- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Metal Extraction and Bioleaching
- earthquake and tectonic studies
- X-ray Spectroscopy and Fluorescence Analysis
- Minerals Flotation and Separation Techniques
- Radioactive element chemistry and processing
- Glass properties and applications
- Clay minerals and soil interactions
- Iron oxide chemistry and applications
- Geochemistry and Geologic Mapping
- Mine drainage and remediation techniques
- Geochemistry and Elemental Analysis
- Crystallization and Solubility Studies
- Material Science and Thermodynamics
- Extraction and Separation Processes
- Calcium Carbonate Crystallization and Inhibition
- X-ray Diffraction in Crystallography
- Arsenic contamination and mitigation
- Aerogels and thermal insulation
- Nitrogen and Sulfur Effects on Brassica
- Coal and Its By-products
- Advanced X-ray and CT Imaging
- Chemical and Physical Properties in Aqueous Solutions
- Electronic and Structural Properties of Oxides
Australian Synchrotron
2016-2025
Australian Nuclear Science and Technology Organisation
2019-2025
Australian National University
2005-2021
Canberra (United Kingdom)
2021
University of California, Los Angeles
2008
The concentration of sulfur in basalt-like silicate melts as S2– is limited to the amount at which melt becomes saturated with a sulfide phase, such an immiscible melt. limiting solubility called 'sulfur content saturation' (SCSS). Thermodynamic modelling shows that SCSS depends on FeO from two terms, one negative dependence comes activity melt, and other positive strong capacity (CS) content. interaction between these terms should yield net has asymmetric U-shaped if variables are kept...
Dissolved organic matter (DOM) plays an important role in soil structure and biogeochemical function development, which are fundamental for the eco-engineering of tailings-soil formation to underpin sustainable tailings rehabilitation. In present study, we have characterized DOM composition its molecular changes alkaline Fe ore tailing primed with (OM) amendment plant colonization. The results demonstrated that microbial OM decomposition dramatically increased richness average weight, as...
The neutralization of strongly alkaline pH conditions and acceleration mineral weathering in Fe ore tailings have been identified as key prerequisites for eco-engineering tailings-soil formation sustainable mine site rehabilitation. Acidithiobacillus ferrooxidans has great potential neutralizing accelerating primary the but little information is available. This study aimed to investigate colonization A. its role elemental sulfur (S0) oxidation, neutralization, Fe-bearing through a microcosm...
Sulfur (S) is an essential plant nutrient, but ongoing decreases in inorganic S inputs to soil continue reduce availability agricultural soils globally. This study investigated long-term trends speciation after land use change and the application of different amendments using world's longest-running experiments at Rothamsted Research Centre, UK. Soil samples spanning 145 years were obtained from Broadbalk Wheat Experiment (continuous cropping with amendments) two Wilderness sites, Geescroft...
Understanding the speciation and thermodynamic properties of aqueous tungsten (W) complexes under various conditions is essential for predicting W transport in hydrothermal fluids relevant to ore formation geothermal systems. Although previous experimental geochemical modelling studies have provided insights into solubility systems, a comprehensive molecular-level understanding remains elusive. In this study, we employed ab initio molecular dynamics (MD) simulations determine coordination...
A series of vanadium-doped orthoniobates the type La(Nb1-xVx)O4 (x = 0.00-0.40) were synthesized using a solid-state method, and their long-range average short-range local structures comprehensively investigated combination high-resolution neutron powder diffraction (NPD) synchrotron X-ray (S-XRD) that produced accurate precise several members series. The evolve from monoclinic fergusonite-type to tetragonal scheelite-type structure as V content increases. Substituting Nb5+ by smaller V5+...
Pioneer plants play an important role in eco-engineering Fe ore tailings into soil for sustainable mine site rehabilitation. However, root-driven mineral weathering and secondary formation remain poorly understood tailings, despite being prerequisites aggregate pedogenesis. The present study aimed at characterizing the direct of plant roots tailing a compartmented cultivation system. It was found that root activities accelerated biotite-like minerals via Fe(II) oxidation coupled with Fe(III)...
The effect of H 2 O on sulfide melting temperatures has been investigated in the FeS-PbS-ZnS system at 1.5 GPa, revealing that the addition results a 35°C drop temperature from 900° to 865°C. In point depression, solubility is confirmed by presence vesicles quenched melt. No oxide phases were present any run products, ruling out oxidation as cause depression. Confirmation melts is consistent with recent suggestion Mungall and Brenan (2003) a magmatic origin for halogen-rich alteration...
The solubility of andradite garnet was determined at 800 °C and 10 kbar in a solution mol% NaCl 90 H2O. Experiments were syntheses carried out with high-purity natural wollastonite, reagent hematite or specular containing ~1 wt% TiO2, fluid. All experiments performed Mn2O3-Mn3O4 Fe2O3-Fe3O4 oxygen buffers piston-cylinder apparatus pressure media for 1-3 days. Andradite saturation by the presence absence quenched charges.
Copper is a redox variable element that may occur as Cu0, Cu+, and Cu2+ in the Earth's crust. The oxidation state will affect its partitioning between coexisting minerals, melts fluids hence behaviour magmatic processes. bearing silicate glasses were quenched from with 23 synthetic compositions (19 CaO-Na2O-MgO-Al2O3-SiO2, two "granites" containing K2O±H2O, Fe-bearing "MORB" "andesite") equilibrated at oxygen fugacities (fO2), expressed log units relative to fayalite-magnetite-quartz (ΔFMQ)...
The series Ba5R2Al2SnO13 (R = In, Y, Er, Ho, Tb) has been synthesized and structurally characterized by X-ray neutron powder diffraction. All members have oxygen-deficient 10-layer hexagonal (10H) perovskite-type structures at high temperature gain mass on cooling equivalent to ∼0.5 oxygen atoms per formula unit, observed both thermogravimetric analysis the occupancy of a vacant site in substructure refined against diffraction data. origin this varies with R: for R it is due water uptake via...
Determining the oxidation state of Fe through parameterization X-ray absorption near-edge structure (XANES) spectral features is highly dependent on accurate and repeatable energy calibration between spectra. Small errors in can lead to vastly different interpretations. While simultaneous measurement a reference foil often undertaken spectroscopy beamlines, other beamlines measure XANES spectra without therefore lack method for correcting drift. Here proposed that combines two measures taken...
The Macquarie University Deformation-DIA (MQ D-DIA) multi-anvil apparatus at the Australian Synchrotron provides a new experimental facility that enables simultaneous high-pressure and high-temperature in situ synchrotron experimentation Australia. MQ D-DIA can be easily deployed any of number beamlines Synchrotron, we describe its installation x-ray absorption spectroscopy beamline, which near-edge energy-scanning diffraction. A simple, reliable, transparent cell assembly has been developed...
Platinum-doping of hematite (α-Fe<sub>2</sub>O<sub>3</sub>) is a popular method to increase the performance in photoelectrochemical applications. Here we show that additional charge caused by Pt<sup>4+</sup>is balanced an Fe<sup>3+</sup>vacancy.