Diffuse scattering in the paraelectric phase of titanite

DOI

Titanite consists of TiO6 octahedra arranged in chains. These are linked by SiO4 tetrahedra. At room temperature, Ti is slightly off-center resulting in an alternation of short and long Ti-O bonds. The displacement direction is reversed between neighbouring chains making it antiferroelectric at room temperature. A phase transition occurs near 500 K where the Ti is centering in the octahedra on average. X-ray diffuse scattering indicates that 2D short-range correlations develop above Tc characterised by streaks. We have obtained data at room temperature from a unique large high-quality crystal at 300 K and observed diffuse scattering throughout reciprocal space. A model has been developed that reproduces the diffuse scattering. We would like to map the diffuse scattering at 500 K and model in detail the origin of the diffuse streaks. Therefore we ask for 4 days of beamtime on SXD.

Identifier
DOI https://doi.org/10.5286/ISIS.E.24078135
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24078135
Provenance
Creator Dr Matthias Gutmann; Dr Chris Stock; Dr Ian Swainson
Publisher ISIS Neutron and Muon Source
Publication Year 2012
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2009-11-13T08:24:21Z
Temporal Coverage End 2009-11-20T15:43:04Z