Publications by authors named "Simon C Middleburgh"

3 Publications

  • Page 1 of 1

High-Entropy Alloys for Advanced Nuclear Applications.

Entropy (Basel) 2021 Jan 11;23(1). Epub 2021 Jan 11.

Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK.

The expanded compositional freedom afforded by high-entropy alloys (HEAs) represents a unique opportunity for the design of alloys for advanced nuclear applications, in particular for applications where current engineering alloys fall short. This review assesses the work done to date in the field of HEAs for nuclear applications, provides critical insight into the conclusions drawn, and highlights possibilities and challenges for future study. It is found that our understanding of the irradiation responses of HEAs remains in its infancy, and much work is needed in order for our knowledge of any single HEA system to match our understanding of conventional alloys such as austenitic steels. A number of studies have suggested that HEAs possess `special' irradiation damage resistance, although some of the proposed mechanisms, such as those based on sluggish diffusion and lattice distortion, remain somewhat unconvincing (certainly in terms of being universally applicable to all HEAs). Nevertheless, there may be some mechanisms and effects that are uniquely different in HEAs when compared to more conventional alloys, such as the effect that their poor thermal conductivities have on the displacement cascade. Furthermore, the opportunity to tune the compositions of HEAs over a large range to optimise particular irradiation responses could be very powerful, even if the design process remains challenging.
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http://dx.doi.org/10.3390/e23010098DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7827623PMC
January 2021

Synthesis and DFT investigation of new bismuth-containing MAX phases.

Sci Rep 2016 Jan 7;6:18829. Epub 2016 Jan 7.

Department of Materials and Centre for Nuclear Engineering, Imperial College London, London SW7 2BP, United Kingdom.

The Mn + 1AXn phases (M = early transition metal; A = group A element and X = C and N) are materials exhibiting many important metallic and ceramic properties. In the present study powder processing experiments and density functional theory calculations are employed in parallel to examine formation of Zr2(Al1-xBix)C (0 ≤ x ≤ 1). Here we show that Zr2(Al1-xBix)C, and particularly with x ≈ 0.58, can be formed from powders even though the end members Zr2BiC and Zr2AlC seemingly cannot. This represents a significant extension of the MAX phase family, as this is the first report of a bismuth-based MAX phase.
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http://dx.doi.org/10.1038/srep18829DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4703982PMC
January 2016

Novel chemical synthesis and characterization of CeTi(2)O(6) brannerite.

Inorg Chem 2014 Jul 13;53(13):6761-8. Epub 2014 Jun 13.

Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation , Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.

Cerium titanate CeTi2O6 was prepared by a new soft chemistry route in aqueous solution. A suite of characterization techniques, including X-ray diffraction, thermal analysis, vibrational spectroscopy, and scanning and transmission electron spectroscopy, were employed to investigate the brannerite structure formation and its bulk properties. The synthesized powder formed the brannerite crystal structure upon calcination at temperatures as low as 800 °C. Samples sintered at 1350 °C possess a high level of crystallinity. X-ray absorption near-edge structure results indicate the presence of six-coordinated Ce(4+) in the brannerite samples.
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http://dx.doi.org/10.1021/ic500563jDOI Listing
July 2014