High Pressure Neutron Diffraction of Croconic Acid

DOI

Croconic acid (Cacid) possesses a well-defined hysteresis in polarization at room temp and the highest spontaneous polarization observed in organic ferroelectrics to date. The high polarity reversal is thought to be related to the 2 crystallographically independent hydrogen bonding networks.Recently, we performed investigations on Cacid under high-pressure to determine if the pressure induced shortening of the O-O bond would affect the dynamic proton behaviour. The results indicate pressure-induced polymerization near 5.5 GPa.Between 5-10 GPa a gradual diffuse change traditionally associated with a ferroelectric-paraelectric phase transition was observed in the dielectric constant. Upon decompression, the characteristics of the high-pressure polymorph are retained. A neutron study of Cacid using PEARL to investigate the structural changes in the hydrogen bonding network seems warranted.

Identifier
DOI https://doi.org/10.5286/ISIS.E.61000487
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/61000487
Provenance
Creator Mr Karl Hope; Dr Steve Hunter; Dr Jennifer Ciezak-Jenkins
Publisher ISIS Neutron and Muon Source
Publication Year 2018
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 2015-07-14T09:00:00Z
Temporal Coverage End 2015-07-19T11:21:36Z