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Abstract
Superionic crystals reach an ionic conductivity comparable to liquid electrolytes following a superionic transition at high temperature. The physical mechanisms that lead to this behaviour remain poorly understood. It has been proposed that superionic transitions are accompanied by the breakdown of specific phonon modes linked to characteristic diffusion processes. Any changes in vibrational properties across the superionic transition may therefore provide insights into the underlying physics of this phenomenon. Here, we apply a combination of lattice dynamics and ab initio molecular dynamics to probe the vibrational properties of the archetypal superionic conductor Li3N. We assess harmonic, quasi-harmonic, and anharmonic descriptions of the phonons. The harmonic and quasi-harmonic models show no change in features across the superionic transition. The anharmonic model, however, exhibits a breakdown for all modes. The implications for developing lattice-dynamics-based descriptors for superionic conductors are discussed. This journal is
Original language | English |
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Pages (from-to) | 2295-2304 |
Number of pages | 10 |
Journal | Journal of Materials Chemistry A |
Volume | 10 |
Issue number | 5 |
Early online date | 19 Oct 2021 |
DOIs | |
Publication status | Published - 7 Feb 2022 |
Bibliographical note
Publisher Copyright:© The Royal Society of Chemistry.
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science
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Dive into the research topics of 'Anharmonic lattice dynamics of superionic lithium nitride'. Together they form a unique fingerprint.Projects
- 1 Finished
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Computational Discovery of Conduction Mechanisms in Lithium-Ion Solid Electrolytes
Morgan, B. (PI)
1/10/19 → 30/09/22
Project: Research council