https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49897 Wed 14 Jun 2023 10:29:47 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20227 Wed 11 Apr 2018 14:55:27 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:14334 *, well below the conventional Burns temperature but ~50 K above the ferroelectric transition. Elastic softening due to polarization of the PNR shows polarization memory through two phase transitions and is greater than the softening associated with polarization of the ferroelectric phases. This emphasizes that PNR dominate the material properties at all temperatures below T^*.]]> Wed 11 Apr 2018 12:59:09 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4575 Wed 11 Apr 2018 12:04:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4516 Wed 11 Apr 2018 10:39:03 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41642 Wed 10 Aug 2022 08:43:25 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43161 Tue 13 Sep 2022 15:35:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33676 Tue 04 Dec 2018 16:13:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35238 Tue 02 Jul 2019 15:21:49 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40402 Thu 24 Aug 2023 09:28:56 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36353 Thu 01 Jun 2023 12:41:19 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:5287 Sat 24 Mar 2018 10:23:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1327 Sat 24 Mar 2018 08:32:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1588 Sat 24 Mar 2018 08:30:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:11449 n+1AX_n Phase materials. D20 has enabled us to explore the ultra-fast reaction kinetics of a Self-propagating High-temperature Synthesis (SHS) of model M_n+1AX_n Phase systems at a <900 ms time resolution. In turn, this technique has been further refined and applied in the confirmation of a novel solid state M_n+1AX_n Phase precursor design. The ability to simultaneously explore the in situ chemical and thermal environments of large volume samples has provided us with a means of rapidly prototyping novel synthesis techniques. By way of example, the successful application of solid state precursors has reduced the M_n+1AX_n Phase synthesis times and temperatures by approximately 50 and 44%, respectively. The development and application times for these precursors could not have been achieved without application of these diffractometers’ capabilities. More generally, time-resolved in-situ neutron diffraction has the potential to redefine many research techniques in both materials science and solid state physics if two experimental methodologies can be perfected: (1) concurrent experimentation and (2) complementary analysis. More specifically, we should aim to couple in situ neutron scattering with the simultaneous analysis of chemical, thermal, physical or environmental factors, while analysis using complementary techniques (e.g. neutrons and X-rays) will ideally produce higher scientific standards in characterisation. Together, these methodologies will significantly reduce the development time and complexity of novel materials syntheses, while ultimately lowering associated costs. The key to achieving these goals is the design and implementation of robust in situ sample environments capable of exploring a wide range of synthesis and simulated service environments. In conclusion, the designs and commissioning of equipment intended for these aims will also be discussed.]]> Sat 24 Mar 2018 08:14:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:12011 3AlC₂ has an interesting combination of electrical, thermal and mechanical properties. Single crystal elastic constants under the Reuss approximation for the micromechanical state were obtained by analysing the shifts of neutron diffraction peaks while a polycrystalline sample was subjected to a compressive load varying from 5 to 300 MPa. The values of Young’s modulus and Poisson’s ratio computed from the single crystal compliances are in good agreement with those obtained directly from strain gauges and from the average changes in the a and c unit cell parameters.]]> Sat 24 Mar 2018 08:11:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:10719 Sat 24 Mar 2018 08:09:48 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19030 3SiC₂ irradiated by 700 keV C ions has been investigated over a range of fluences and sample temperatures. The samples were analysed using a series of experimental techniques, including glancing-incidence X-ray diffraction, Rutherford backscattering spectrometry, Raman spectroscopy and scanning electron microscopy. This material exhibits a high level of tolerance to damage, especially at high temperature. Irradiation at temperatures from room temperature to 270 °C results in decomposition to TiC; however, this is not observed at temperatures above 270 °C. A minimum in the observed damage level is evident for irradiation at a sample temperature of 350 °C. At higher temperatures the damage level increases, and results in material which is made up of damaged Tii₃SiC₂.]]> Sat 24 Mar 2018 08:05:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19997 Sat 24 Mar 2018 07:50:48 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:325 Sat 24 Mar 2018 07:42:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29118 Sat 24 Mar 2018 07:36:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27727 0.31Ba_0.69)B₆ ~85% (by mass). The Richardson work function and emission constant for this boride mixture were found to be 1.03 eV and 8.44 x 10^-6 A cm K^-2 respectively.]]> Sat 24 Mar 2018 07:36:44 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26983 15 ions cm⁻². The evolution of microstructure and induced defects of the irradiated sample with different doses was surveyed by combining grazing incident X-ray diffraction (GIXRD) using synchrotron radiation and variable energy positron beam analysis (PBA). With increasing irradiation dose, the crystallinity degrades gradually and leads to a combination of damaged Ti₃SiC₂ in combination with the precipitation of a TiCₓ phase. For high dose irradiation, a nano-dispersed TiCₓ phase becomes the dominant component. The PBA measurements indicate the formation of a new large vacancy-type defect that could be a cluster or void. The combination of GIXRD and PBA demonstrates that the damage of the MAX phase is more serious in the first 10 nm surface layer than that in the deeper layers closer to the final resting position of the projectile in the solid. The possible damage mechanisms have been discussed.]]> Sat 24 Mar 2018 07:26:59 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26227 Sat 24 Mar 2018 07:24:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3451 Sat 24 Mar 2018 07:20:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3434 100 K/s. Despite the existence of four other titanium silicides (TiSi₂, TiSi, Ti₅Si₄, Ti₃Si) evidence of these or other intermediate phases was not found in either the pre-heating or reaction stages of the process. The reaction is, however, narrowly preceded by the α→β transformation in Ti, which initiates interdiffusion and acts as a trigger for SHS ignition. The formation of Ti₅Si₃ appears to occur by the direct solid state reaction of β-Ti and Si.]]> Sat 24 Mar 2018 07:20:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:22092 0.67. It was found that a TiC nanocrystalline phase was formed under the high dose irradiation. However, a complete decomposition by irradiation did not take place even at 10.3 dpa. Post irradiation annealing to temperatures of 500–800 °C results in crystal regrowth of Ti₃SiC₂ and TiC phases.]]> Sat 24 Mar 2018 07:15:15 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32042 in situ loads in the absence of residual stress. This paper details an experimental proof of concept for this algorithm involving the full reconstruction of a biaxial strain field within a nontrivial steel sample. Aside from a small systematic error present within individual measurements, the experiment was a success and now serves as a practical demonstration of Bragg-edge transmission strain tomography for systems under in situ loads.]]> Mon 30 Oct 2023 14:43:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41758 Fri 12 Aug 2022 11:42:41 AEST ]]>