The icy-moon ‘analogue’ of MgSiO3-perovskite: MgSO4.9H2O – a high-pressure study

DOI

Mg-sulfate 11-hydrate (meridianiite) is decomposed by pressure to form Mg-sulfate 9-hydrate + ice, a process that will occur in the mantles of large icy planetary bodies and have the same impact as olivine's decomposition to Mg-silicate perovskite + MgO in the Earth's mantle.It is necessary for accurate modelling of planetary interiors to determine the high-pressure behaviour of Mg-sulfate 9-hydrate, which includes measurement of its incompressibility (K), as well as the pressure and temperature dependence of K, and characterisation of any phase changes. Some sparse and low-quality data already obtained, combined with DFT calculations, indicate a bulk elastic softening above 1 GPa that may indicate a further phase transition or dehydration. I propose to carry out a gas-cell study on OSIRIS (0-550 MPa, 100-240 K) and a Paris-Edinburgh cell study on PEARL (0-5 GPa, 100-380 K).

Identifier
DOI https://doi.org/10.5286/ISIS.E.83548995
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/83548995
Provenance
Creator Dr Weiwei Wang; Dr Christopher Howard; Professor Ian Wood; Dr Nicholas Funnell; Dr Dominic Fortes
Publisher ISIS Neutron and Muon Source
Publication Year 2019
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 2016-11-24T10:00:00Z
Temporal Coverage End 2016-11-29T10:00:00Z