ISIS Neutron and Muon Source Data Journal

Structure and thermal expansion of a recovered high-pressure polymorph of ammonia dihydrate

Abstract: In our high-pressure studies of candidate outer solar system minerals using PEARL, we have observed a number of high-pressure polymorphs of ammonia dihydrate, some of which have proved amenable to indexing and structure solution, occasionally with the aid of constrained ab initio structure prediction. However, one of these, ADH IV, has evaded structure solution; the most likely reason for this is that the indexing is not correct. A recent STFC grant has allowed us to build a high-pressure device and liquid-nitrogen recovery system, allowing us to synthesise these hard-to-solve high-pressure phases and quench them to ambient pressure below 100 K. We propose to do this with ADH IV and exploit the high resolution of HRPD for indexing, powder structure solution and high-precision measurement of the thermal expansion tensor.

Principal Investigator: Dr Dominic Fortes
Experimenter: Dr Christopher Howard
Experimenter: Dr Weiwei Wang
Experimenter: Professor Ian Wood

DOI: 10.5286/ISIS.E.RB1710127

ISIS Experiment Number: RB1710127

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 Dominic Fortes et al; (2018): Structure and thermal expansion of a recovered high-pressure polymorph of ammonia dihydrate, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1710127

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