Browsing by Author "Phillips, MR"
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- ItemElectron backscatter diffraction characterization of plasma immersion ion implantation effects in stainless steel(Elsevier, 2013-01-15) Davis, J; Short, KT; Wuhrer, R; Phillips, MR; Lumpkin, GR; Whittle, KRIn these experiments plasma immersion ion implantation is utilised to simulate some of the radiation effects in a nuclear reactor environment. Scanning electron microscopy using the angular selective backscatter detector has revealed observable changes in crystallographic contrast after irradiation with helium ions. Further studies using electron backscatter diffraction in both plan and cross section view allow us to visualize the extent and depth of damage and observe differences in the behavior of different crystalline phases present in several grades of stainless steel. © 2012, Elsevier B.V.
- ItemA luminescence study of porous diatoms(European Materials Research Society, 2004-05) Butcher, KSA; Ferris, JM; Phillips, MR; Wintrebert-Fouquet, M; Jong Wah, JW; Jovanovic, N; Vyverman, W; Chepurnov, VA
- ItemLuminescence study of porous diatoms(Elsevier, 2005-12) Butcher, KSA; Ferris, JM; Phillips, MR; Wintrebert-Fouquet, M; Jong Wah, JW; Jovanovic, N; Vyverman, W; Chepurnov, VAThe cathodoluminescent and photoluminescent properties of the nanoporous silica frustules of various diatom strains and of natural diatom samples are presented. The spectra are observed to be similar to that of pure silica glass and the phenology is therefore believed to also be somewhat similar. A strong U-V-blue luminescence peak is commonly observed as well as a yellow peak at 2.15 eV For the more heavily silicified field-collected freshwater benthic samples, a strong red peak at 1.95 eV is also observed. The 2.15 eV peak is also more strongly evident for the field-collected samples. The U-V-blue peak is related to common silica defect structure but cathodoluminescent microanalysis shows that this emission is highly localized in the diatom samples. © 2005, Elsevier Ltd.
- ItemPhotoluminescence and cathodoluminescence studies of diatoms - nature’s own nano-porous silica structures(Australian and New Zealand Institute of Physics, 2003-02) Butcher, KSA; Ferris, JM; Phillips, MRPhotoluminescence (PL) and cathodoluminescence (CL) data are presented for the silica frustules of some fresh water diatoms. The diatom frustules consist of a nano-porous silica structure that may possibly be exploited for optoelectronic or photonic applications. This work represents what we believe to be the first report of the CL and PL properties of this naturally occurring source of nano-porous silica.
- ItemSEM and EBSD studies of ion implanted stainless steel(Committee of Asia-Pacific Societies of Microscopy, 2012-02-07) Davis, J; Short, KT; Wuhrer, R; Phillips, MR; Lumpkin, GR; Whittle, KRResearch is currently in progress to determine the effect ion irradiation at varying energy and fluence has on the microstructure of several grades of stainless steel. Plasma Immersion Ion Implantation (PI3) and the Small Tandem for Applied Research (STAR) accelerator have been employed in this research to simulate some of the effects from a neutron irradiation environment using helium ions. The overall aim of the research is to eventually investigate other unique materials that have applications in both GenIV and fusion reactor programs and the Advanced Fuel Cycle Initiative (AFCI), e.g., inert matrix fuels, reactor core liners, and structural materials within the reactor (ODS materials). The main focus of this work will be to study the microstructure and understand grain boundary interactions, and how they relate to the tolerance of materials to damage.
- ItemSurface electronic properties of ZnO nanoparticles(American Institute of Physics, 2008-06-30) Ton-That, C; Phillips, MR; Foley, M; Moody, SJ; Stampfl, APJThe surface electronic structure of ZnO nanoparticles has been studied with photoemission and x-ray absorption spectroscopies. Contrary to expectation, ZnO:Zn phosphor nanoparticles were found to contain a lower oxygen vacancy density on the surface than undoped ZnO counterparts, but oxygen vacancies are in different chemical environments. Cathodoluminescence shows intense green luminescence from the ZnO:Zn surface, while the undoped nanoparticles exhibit only the near-band-edge emission. The results indicate the roles of surface oxygen vacancies and their environment in the previously unexplained green luminescence from the ZnO:Zn material. © 2008, American Institute of Physics
- ItemTrends revealed by EBSD in ion implanted stainless steel(Australian Microbeam Analysis Society, 2013-02-06) Davis, J; Short, KT; Wuhrer, R; Phillips, MR; Lumpkin, GRIn these experiments plasma immersion ion implantation is utilised to simulate some of the radiation effects in a nuclear reactor environment. Scanning electron microscopy using the angular selective backscatter detector has revealed observable changes in crystallographic contrast after irradiation with helium ions. Further studies using electron backscatter diffraction in both plan and cross section view allow us to visualize the extent and depth of damage and observe differences in the behavior of different crystalline phases present in several grades of stainless steel.