Grain-boundary sliding in high-temperature ceramics: mechanical spectroscopy of high-purity magnesium oxide. The demise of elastic behaviour in materials stressed at sufficiently high temperature limits the usefulness of ceramics for structural applications, and is also responsible for reduced wave speeds and associated attenuation of seismic waves in the Earth's interior. Yet the nature of the transition in fine-grained materials tested at high temperature from elastic through anelastic to vis ....Grain-boundary sliding in high-temperature ceramics: mechanical spectroscopy of high-purity magnesium oxide. The demise of elastic behaviour in materials stressed at sufficiently high temperature limits the usefulness of ceramics for structural applications, and is also responsible for reduced wave speeds and associated attenuation of seismic waves in the Earth's interior. Yet the nature of the transition in fine-grained materials tested at high temperature from elastic through anelastic to viscous rheology remains poorly understood. Through a combination of mechanical testing by torsional forced oscillation/ microcreep methods of carefully fabricated and characterised specimens of polycrystalline MgO and associated micro-mechanical modelling we seek to clarify this fundamental and general aspect of high-temperature mechanical behaviour.Read moreRead less
Coupled Structural and Elastic Response Studies of the Phase Transformation Behaviour of Environment-Friendly, Lead-free Piezoceramics. The ultimate aim of this project is to identify high performance, environment-friendly i.e. lead free, piezoceramic materials capable of replacing the currently market dominant, lead-based materials. Such piezoceramics have widespread industrial applications. Understanding the factors that control the capacity of such materials to respond to applied stress or el ....Coupled Structural and Elastic Response Studies of the Phase Transformation Behaviour of Environment-Friendly, Lead-free Piezoceramics. The ultimate aim of this project is to identify high performance, environment-friendly i.e. lead free, piezoceramic materials capable of replacing the currently market dominant, lead-based materials. Such piezoceramics have widespread industrial applications. Understanding the factors that control the capacity of such materials to respond to applied stress or electric field is critical to the discovery, optimization and, ultimately, industrial exploitation of such materials. Through comprehensive experimental and theoretical studies of a number of such materials this project will enhance the ability of industry to develop new and improved materials. Development of advanced materials is a designated National Research Priority area. Read moreRead less
Understanding nanostructure in lead-containing piezoceramics - the key to improved and environmentally-friendly materials. Lead-containing piezoelectric ceramics form the basis of multi-billion dollar industries, posing an increasingly serious environmental threat due to the toxicity of lead. By obtaining a detailed understanding of how their properties arise from their nanoscale structure and chemistry, our research will lead to improvements in existing materials and aid the quest for environme ....Understanding nanostructure in lead-containing piezoceramics - the key to improved and environmentally-friendly materials. Lead-containing piezoelectric ceramics form the basis of multi-billion dollar industries, posing an increasingly serious environmental threat due to the toxicity of lead. By obtaining a detailed understanding of how their properties arise from their nanoscale structure and chemistry, our research will lead to improvements in existing materials and aid the quest for environmentally-friendly alternatives. We will use a methodology for the elucidation of local structure and dynamics in which we are world leaders. The project will further enhance our standing in the field, provide excellent research training for students and early-career researchers and highlight the power and potential of Australia's new Synchrotron and OPAL research reactor.Read moreRead less
A high performance and environment-friendly piezoelectric detector platform for biosensor applications. The development of high performance, lead-free, piezoelectric films and their incorporation into devices is rapidly becoming an urgent task as a result of recent legislation banning the use of lead in electronic components. The successful development of piezoelectric biosensors, as proposed in this project, has numerous potential benefits including the prospect of rapid and cheap biosensor dev ....A high performance and environment-friendly piezoelectric detector platform for biosensor applications. The development of high performance, lead-free, piezoelectric films and their incorporation into devices is rapidly becoming an urgent task as a result of recent legislation banning the use of lead in electronic components. The successful development of piezoelectric biosensors, as proposed in this project, has numerous potential benefits including the prospect of rapid and cheap biosensor devices as well as an environment-friendly, sensitive and real time solution for on-site drug, chemical and biological sensing. Successful development of the latter would provide immediate benefit in the areas of national security, food safety as well as in environmental and health monitoring. Read moreRead less
Rare Earth doped chalcogenide glass films for on-chip optical amplifiers. The project will contribute to Australia's strong record of achievement in photonics technology. It has the potential to migrate photonic chip technology for all-optical processing from laboratory demonstrations to a commercially viable technology. If this is achieved commercialisation through a start-up company will become possible. All-optical processing is an advanced technology that will help increase the speed and the ....Rare Earth doped chalcogenide glass films for on-chip optical amplifiers. The project will contribute to Australia's strong record of achievement in photonics technology. It has the potential to migrate photonic chip technology for all-optical processing from laboratory demonstrations to a commercially viable technology. If this is achieved commercialisation through a start-up company will become possible. All-optical processing is an advanced technology that will help increase the speed and the bandwidth of optical communications systems and the internet.Read moreRead less
Understanding the deep mantle: experimental petrology at very high pressures. The great processes that shape the Earth at its surface, including plate tectonics and continental drift, can only be understood by appreciating how the interior of the Earth works. However, studying the deep Earth is difficult because of the enormous pressures and temperatures involved. This research proposes to simulate conditions in the Earth's lower mantle (that is, below 670 km in depth) by making use of an Austra ....Understanding the deep mantle: experimental petrology at very high pressures. The great processes that shape the Earth at its surface, including plate tectonics and continental drift, can only be understood by appreciating how the interior of the Earth works. However, studying the deep Earth is difficult because of the enormous pressures and temperatures involved. This research proposes to simulate conditions in the Earth's lower mantle (that is, below 670 km in depth) by making use of an Australian invented diamond-based ceramic, to double the pressure at which experiments can be performed. The information gained from this fundamental research will help predict how giant ore bodies form. The development of the high-pressure apparatus will also aid material scientists in their quest for novel materials.Read moreRead less
An integrated approach towards the development of new generation RF/microwave dielectric materials. The ultimate aim of this project is to rationally design and optimize new types of environmentally-sustainable, cost-effective and high performance microwave dielectric materials and devices for advanced information and communication technology (ICT) applications. This is a designated National Research Priority area. Our fundamental understanding of dielectric materials and their properties will b ....An integrated approach towards the development of new generation RF/microwave dielectric materials. The ultimate aim of this project is to rationally design and optimize new types of environmentally-sustainable, cost-effective and high performance microwave dielectric materials and devices for advanced information and communication technology (ICT) applications. This is a designated National Research Priority area. Our fundamental understanding of dielectric materials and their properties will be enhanced considerably by working on this project. Further, we will promote the relationship between the fundamental science of polar crystalline materials and practical applications. If successful, the results will enhance Australia's capacity and standing in this highly competitive area. Read moreRead less
Seismic wavespeeds and attenuation in upper-mantle rocks: a laboratory study of the effect of partial melting. The influence of partial melting on the seismic properties of the Earth's upper mantle will be explored through a laboratory study. Synthetic rock specimens consisting of the upper-mantle mineral olivine and a small proportion of basaltic magma will be prepared and their grain-scale melt distribution will be characterised. The seismic properties of these materials will be measured at ....Seismic wavespeeds and attenuation in upper-mantle rocks: a laboratory study of the effect of partial melting. The influence of partial melting on the seismic properties of the Earth's upper mantle will be explored through a laboratory study. Synthetic rock specimens consisting of the upper-mantle mineral olivine and a small proportion of basaltic magma will be prepared and their grain-scale melt distribution will be characterised. The seismic properties of these materials will be measured at high temperatures and seismic frequencies with novel locally developed equipment. Comparison with melt-free equivalents will allow the influence of the added magma to be quantified, allowing robust interpretation of seismological models of Earth structure with implications for its chemical and dynamical evolution.Read moreRead less
The Role of Hydrous Fluids in Fault Processes: An Experimental Study. The proposed project seeks to understand how hydrothermal reactions in fault zones affect various physical properties such as fault strength and permeability. The project will be conducted by performing high pressure experiments which simulate natural conditions. I will also develop new analytical techniques to characterize the microstructural evolution of faults, with a focus on understanding how any changes alter the hydrolo ....The Role of Hydrous Fluids in Fault Processes: An Experimental Study. The proposed project seeks to understand how hydrothermal reactions in fault zones affect various physical properties such as fault strength and permeability. The project will be conducted by performing high pressure experiments which simulate natural conditions. I will also develop new analytical techniques to characterize the microstructural evolution of faults, with a focus on understanding how any changes alter the hydrologic behaviour of the fault. This study will shed much needed information related to the mechanisms of earthquake nucleation, and to the formation mechanism of fault-hosted gold deposits.Read moreRead less
Development of Methods and Strategies for the Measurement, Interpretation and Analysis of Diffuse X-ray Scattering from Disordered Materials. This application seeks to exploit our established lead in the measurement of diffuse scattering from disordered materials and its analysis using large-scale computer simulations. Many industrially important materials such as ceramics, superconductors, catalysts, electro-optical materials and minerals owe their special properties to the disorder in their st ....Development of Methods and Strategies for the Measurement, Interpretation and Analysis of Diffuse X-ray Scattering from Disordered Materials. This application seeks to exploit our established lead in the measurement of diffuse scattering from disordered materials and its analysis using large-scale computer simulations. Many industrially important materials such as ceramics, superconductors, catalysts, electro-optical materials and minerals owe their special properties to the disorder in their structure. This disorder causes diffuse X-ray scattering which can be probed using synchrotron X-rays and powerful computers to reveal details about the material's nanoscale structure. The new methodology being developed will enhance our detailed understanding of the relationships between structure and properties in materials and help promote the design of new materials. Read moreRead less