https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8204 0.1) were found to lower the membrane oxygen fluxes, with y³≥0.4 doped SrCo₁₋yScyO₃₋δ ceramics no longer showing any oxygen permeation.]]> Wed 11 Apr 2018 16:15:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49756 Tue 30 May 2023 17:49:40 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55834 Thu 27 Jun 2024 15:31:36 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53741 Thu 11 Jan 2024 12:14:59 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8148 Sat 24 Mar 2018 08:36:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:1327 Sat 24 Mar 2018 08:32:34 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19734 P2₁∣n, and a further transition associated with antiferromagnetic ordering at ⁓8.5 K. The main structural changes, through the phase transition, are orientational ordering of the azetidium groups and associated changes in hydrogen bonding. In marked contrast to conventional improper ferroelastic oxide perovskites, the driving mechanism is associated with the X-point of the cubic Brillouin zone rather than being driven by R- and M-point octahedral tilting. The total ferroelastic shear strain of up to ⁓5% is substantially greater than found for typical oxide perovskites, and highlights the potential of the flexible framework to undergo large relaxations in response to local structural changes. Measurements of elastic and anelastic properties by resonant ultrasound spectroscopy show some of the characteristic features of ferroelastic materials. In particular, acoustic dissipation below the transition point can be understood in terms of mobility of twin walls under the influence of external stress with relaxation times on the order of ⁓10⁻⁷s. Elastic softening as the transition is approached from above is interpreted in terms of coupling between acoustic modes and dynamic local ordering of the azetidium groups. Subsequent stiffening with further temperature reduction is interpreted in terms of classical strain–order parameter coupling at an improper ferroelastic transition which is close to being tricritical. By way of contrast, there are no overt changes in elastic or anelastic properties near 9 K, implying that any coupling of the antiferromagnetic order parameter with strain is weak or negligible.]]> Sat 24 Mar 2018 07:53:46 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50782 Mon 29 Jan 2024 18:40:29 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41162 Fri 23 Feb 2024 10:25:52 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50356 Fri 21 Jul 2023 11:13:01 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47944 Fri 10 Feb 2023 15:10:53 AEDT ]]>