ISIS Neutron and Muon Source Data Journal

Mercury sulphide dimorphism in liquids and glasses

Abstract: A waste majority of crystals exists in several polymorphic forms in different domains of the P,T-diagram. Liquids and glasses also exhibit polyamorphism and the question remains whether the liquid-liquid transformation appears to be a first-order phase transition. The mercury thioarsenate glasses seem to show a different phenomenon: an instantaneous mercury sulphide dimorphism. Our Raman spectroscopy measurements and DFT modelling first exhibit a hybrid Hg-S chain/As-S pyramidal network. Nevertheless, the preliminary high-energy x-ray diffraction measurements suggest also the presence of Hg-S tetrahedra. The proposed ND experiments on HgS-As2S3 liquids and glasses using GEM or SANDALS together with complementary HE-XRD experiments and EPSR/RMS modelling will greatly advance our understanding of these important functional materials and the exciting phenomenon of polyamorphism.

Principal Investigator: Professor Eugene Bychkov
Experimenter: Dr Mariana Milochova
Experimenter: Dr Mohammad Kassem
Experimenter: Dr Alex Hannon

DOI: 10.5286/ISIS.E.RB1510269

ISIS Experiment Number: RB1510269

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:
Professor Eugene Bychkov et al; (2015): Mercury sulphide dimorphism in liquids and glasses, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1510269

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