ISIS Neutron and Muon Source Data Journal

Anomalous fast diffusion of Cu ions in superionic and liquid phases of CuI

Abstract: CuI is well-known to exhibit the superionic behaviour in the high temperature solid state (α-phase), where the mobile Cu ions migrate among the interstices in the f.c.c. sublattice formed by immobile I ions. Even in molten state, Cu ions has 8 times faster diffusion constant than I ions. Such asymmetric behavior between cations and anions can be caused by polarization of anions. From QENS, we distinguished three dynamical modes exist in molten phase, which are slowest diffusion of I ions, intermediate mode of Cu diffusion and fastest local dynamic mode like a rattling vibration. Deep inelastic neutron scattering by VESUVIO can allow us access directly kinetic energy of each constituent. By comparing non-superionic, superionic and liquid phases, the origin of existence of superionic phase regarded as partial melting or partial solidification can be revealed.

Principal Investigator: Dr Yukinobu Kawakita
Experimenter: Dr Bing Li
Experimenter: Dr Kaoru Shibata
Experimenter: Dr Takenao Shinohara
Experimenter: Dr Matthew Krzystyniak

DOI: 10.5286/ISIS.E.RB1610185

ISIS Experiment Number: RB1610185

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 Yukinobu Kawakita et al; (2016): Anomalous fast diffusion of Cu ions in superionic and liquid phases of CuI, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1610185

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