Surveying the higher dimensions of the aperiodic composite nonadecane/urea

Simple item page
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorLemée-Cailleau, MHen_AU
dc.contributor.authorToudic, Ben_AU
dc.date.accessioned2021-12-23T04:04:57Zen_AU
dc.date.available2021-12-23T04:04:57Zen_AU
dc.date.issued2020-02-04en_AU
dc.date.statistics2021-10-13en_AU
dc.description.abstractA decade ago, few we observed for the first time that there exist phase transitions where the structural changes correspond just to degrees of freedom hidden in the internal (super)space of an aperiodic material, here the composite nonadecane/urea [1]. A key factor in the discovery of this type of transition [2] was the examination of the diffraction pattern in 3D, only possible at the time on a four-circle triple-axis neutron spectrometer, the analyzer used in zero-energy transfer to reduce the background and improve resolution. Despite the greater accessibility in reciprocal space compared with earlier experiments using a conventional triple-axis spectrometer, the weak intensity of the superlattice reflections limited the volume of reciprocal space that could be explored. Modern neutron Laue diffractometers with large image-plate detectors permit rapid and extensive exploration of reciprocal space with high resolution in the two-dimensional projection and a wide dynamic range with negligible bleeding of intense diffraction spots [3]. Surveying nonadecane/urea with neutron Laue diffraction from 300 K to 4 K revealed further detail of the superspace-driven phase transition, notably an increase in misorientation in the plane perpendicular to the composite misfit axis, as well as a first-order transition to a new phase at lower temperature. Complementary monochromatic X-ray examination, again using a high-resolution image-plate detector, showed that this new phase corresponds to additional commensurate ordering of the guest alkane subsystem. These observations shed light on how nature can use the degrees of freedom hidden in the internal superspace to form states that cannot be envisaged in the usual 3D real space.en_AU
dc.identifier.citationMcIntyre, G. J., Lemée-Cailleau, M.-H., & Toudic, B. (2020). Surveying the higher dimensions of the aperiodic composite nonadecane/urea. Poster presented to the 44th Condensed Matter and Materials Meeting, Holiday Inn, Rotorua, New Zealand, 4-7 February 2020, (pp. 71). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2020/CMM20_ConferenceHandbook(04Feb2020).pdfen_AU
dc.identifier.conferenceenddate7 February 2020en_AU
dc.identifier.conferencename44th Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceRotorua, New Zealanden_AU
dc.identifier.conferencestartdate4 February 2020en_AU
dc.identifier.pagination71en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2020/CMM20_ConferenceHandbook(04Feb2020).pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12654en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectAmidesen_AU
dc.subjectCarbonic acid derivatesen_AU
dc.subjectCoherent scatteringen_AU
dc.subjectCrystal structureen_AU
dc.subjectDiffraction methodsen_AU
dc.subjectHydrocarbonsen_AU
dc.subjectOrganic nitrogen compoundsen_AU
dc.titleSurveying the higher dimensions of the aperiodic composite nonadecane/ureaen_AU
dc.typeConference Posteren_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
CMM20_ConferenceHandbook(04Feb2020).pdf
Size:
4.1 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications