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We aim to understand and exploit the factors that determine structure and function in the crystalline solid state. As part of ongoing ARC-funded projects, we are currently particularly interested in polar (ferroic) behaviour in the solid state and the exploitable physical properties associated with it such as ferroelectricity, pyroelectricity, piezoelectricity and dielectric behaviour. We also have long term interests in structured diffuse scattering, crystal chemistry and local order in a wide range of compositionally and/or displacively flexible crystalline phases.
Raymond Withers graduated from the University of Melbourne with a BSc (hons) and received his PhD from the University of Melbourne.
Postdoctoral Fellows |
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PhD Candidates |
Bismuth-based pyrochlore dielectric ceramics possess good microwave dielectric properties and have potential application as multilayer microwave dielectric components.
As part of an ARC-funded project involving precise diffraction studies of compositionally and/or temperature induced structural phase changes, coupled electron, X-ray and neutron diffraction studies of composition as well as temperature induced structural phase changes in the NiGe1–xPx, Ni3±xIn1-yTe2+y and Ba4-xSrxNaSb3O12 systems have been carried out.
BaTiO3-doped relaxor ferroelectrics (RF's) exhibit a broad frequency dispersive dielectric constant maxima at a "diffuse phase transition" temperature Tm and a slim P-E ferroelectric hysteresis loop.
More about Structurally Frustrated Polar Nano-regions in BaTiO3-based Relaxor Ferroelectric Systems
Bi-based, cubic pyrochlore phases have been of considerable interest over recent years as a result of their relatively high dielectric constants and low dielectric losses over a considerable frequency range around room temperature coupled with their relatively low sintering temperatures, enabling the possibility of co firing with e.g. Ag electrodes.
More about The Crystal Chemistry of Misplaced-displacive Bi-Based Pyrochlores