ISIS Neutron and Muon Source Data Journal

High Pressure Neutron Diffraction of Croconic Acid

Abstract: 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.

Principal Investigator: Dr Jennifer Ciezak-Jenkins
Experimenter: Mr Karl Hope
Experimenter: Dr Steve Hunter

DOI: 10.5286/ISIS.E.RB1510000

ISIS Experiment Number: RB1510000

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Jennifer Ciezak-Jenkins et al; (2015): High Pressure Neutron Diffraction of Croconic Acid, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1510000

Data is released under the CC-BY-4.0 license.