ISIS Neutron and Muon Source Data Journal

PT-phase diagram of ammonium bromide

Abstract: Ammonium bromide is a fundamental ionic solid that finds practical use, industrially, as a highly-effective flame retardant and also as an intermediary source of bromide in pharmaceutical preparations. It is reported to possess six solid phases, under non-ambient pressures and temperatures, and these can be divided into three groups – those that show i) ferro-type (F) ordering of the NH4+ cation, ii) anti-ferro-type (AF) ordering or, iii) disorder, where the molecules tumble in a plastic phase. Almost no work has been carried out on exploring the wider phase diagram as a function of simultaneous non-ambient pressure and temperature. We aim to identify the location of pressure-temperature phase boundaries - literature studies predict an AF --> F --> AF ordering sequence at low temperature, with increasing pressure, and we will seek to determine if this re-emergent AF behaviour exists.

Principal Investigator: Dr Nicholas Funnell
Experimenter: Dr Christopher Ridley
Experimenter: Dr Anna Herlihy
Experimenter: Dr Craig Bull

DOI: 10.5286/ISIS.E.RB1820580

ISIS Experiment Number: RB1820580

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 Nicholas Funnell et al; (2018): PT-phase diagram of ammonium bromide, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820580

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