ISIS Neutron and Muon Source Data Journal

Pressure induced softening in ScF3

Abstract: Recently we have suggested that negative thermal expansion materials will also show an effect called pressure-induced softening, where shown that the elastic stiffness is anomalously reduced on compression. That is, if B is the bulk modulus, the derivative dB/dP is negative. We have previously shown that in Zn(CN)2 that the dB/dP has a striking temperature-dependence, with positive value at low temperature, then quickly falling to a maximal negative value before slowly tending towards zero at high temperature. We have recently predicted from simulation that the same effect in ScF3 may be an order of magnitude larger. The purpose of this proposal is to test this prediction using powder diffraction and performing measurements across the two-dimensional space of both pressure and temperature. The experiment will be performed using the gas cell pressure device within a cryostat.

Principal Investigator: Professor Martin Dove
Experimenter: Dr Zhongsheng Wei
Experimenter: Mr Guanqun Cai
Local Contact: Dr Ivan da Silva Gonzalez
Experimenter: Dr Craig Bull
Experimenter: Dr Anthony Phillips
Experimenter: Mr Yizheng Zhou
Experimenter: Miss Lei Tan

DOI: 10.5286/ISIS.E.RB1820458

ISIS Experiment Number: RB1820458

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 Martin Dove et al; (2019): Pressure induced softening in ScF3, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820458

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