Browsing by Author "Smith, M"

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    European Network on Neutron Techniques Standardization for Structural Integrity - NeT.
    (American Society of Mechanical Engineers (ASME), 2008-07-27) Ohms, C; Martins, RV; Uca, O; Youtsos, AG; Bouchard, PJ; Smith, M; Keavey, M; Bate, SK; Gilles, P; Wimpory, RC; Edwards, L
    This paper provides an overview over the work of the European Network on Neutron Techniques Standardization for Structural Integrity (NeT). The network involves some 35 organisations from industry and academia and these partners undertake the application of modern experimental and numerical techniques to problems related to the structural integrity of components, mainly relevant to nuclear applications. While being built around neutron scattering techniques, which are predominantly applied for analyses of welding residual stresses, one of the major strengths of the consortium is the diversity in available experimental and numerical techniques. In the residual stress area, for example, many types of materials characterizations testing, several methods for residual stress analysis, including neutron and X-ray diffraction, deep hole drilling, the contour method and others, and many different ways of numerical analysis employing several commercially available FEM codes can be covered by the partners. Currently the network has embarked on five different Task Groups. Four of these are dealing with welding residual stress assessment, and one applies Small Angle Neutron Scattering for studying thermal ageing processes in duplex stainless steels used for reactor core internals. The work already performed in the context of NeT and the envisaged investigations for the ongoing Task Groups are briefly outlined in this paper. The aim is to give the reader a comprehensive overview of the work of NeT and to shed some light on the potential present in this kind of collaborative effort. © The American Society of Mechanical Engineers
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    Exploring the novel pyrovanadate series K2Mn1-xCoV2O7
    (Australian Institute of Physics, 2020-02-04) Smith, M; Avdeev, M; Sauceda Flores, JA
    Materials with the Melilite-type structure have been intensively studied throughout the years due to their interesting piezoelectric, electrochemical, luminescent, magnetic, and structural properties [1,2]. Many oxides with the general formula A2BC2O7 crystallise into the melilite family of minerals, where A is a large cation from group one or two; B is typically a first-row transition metal with four-fold coordination; and C is a smaller cation like Si, V, P, or Ge [1-4]. The Pyrovanadate (A2BV2O7) compounds K2MnV2O7 and K2CoV2O7 exist in the melilite group, with the tetragonal space group P4̅21m, consisting of alternating layers of K+ ions in between MV2O72- sheets comprised of connected MO4 and VO4 tetrahedra (Figure 1) [1,2]. The crystal structure K2Mn1-xCoV2O7 was determined from the rietveld refinement of powder X-ray diffraction (PXRD) patterns. Refinement of PXRD patterns showed a systematic shift in reflections with increasing cobalt content, consistent with an increase of lattice constant parameters. UV-Vis measurements show how the addition of cobalt leads to an additional electronic transition whose intensity increases with increasing cobalt concentration. Tauc plots revealed that the material has a direct band gap of approximately 2 eV. Photoluminescent measurements of the cobalt doped species revealed promising results for white light emitters due to electronic transitions across the cobalt tetrahedra and pyrovanadate units. First magnetic measurements indicate a long-range antiferromagnetic ordering at just over 2 K for K2CoV2O7.
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    FASEA: a FPGA acquisition system and software event analysis for liquid scintillation counting
    (Elsevier, 2009-10-11) Steele, T; Mo, L; Bignell, LJ; Smith, M; Alexiev, D
    The FASEA (FPGA based Acquisition and Software Event Analysis) system has been developed to replace the MAC3 for coincidence pulse processing. The system uses a National Instruments Virtex 5 FPGA card (PXI-7842R) for data acquisition and a purpose developed data analysis software for data analysis. Initial comparisons to the MAC3 unit are included based on measurements of 89Sr and 3H, confirming that the system is able to accurately emulate the behaviour of the MAC3 unit. © 2009, Elsevier Ltd.