Rettie, AJE;
Ding, J;
Zhou, X;
Johnson, MJ;
Malliakas, CD;
Osti, NC;
Chung, DY;
... Kanatzidis, MG; + view all
(2021)
A two-dimensional type I superionic conductor.
Nature Materials
, 20
pp. 1683-1688.
10.1038/s41563-021-01053-9.
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Abstract
Superionic conductors possess liquid-like ionic diffusivity in the solid state, finding wide applicability from electrolytes in energy storage to materials for thermoelectric energy conversion. Type I superionic conductors (for example, AgI, Ag2Se and so on) are defined by a first-order transition to the superionic state and have so far been found exclusively in three-dimensional crystal structures. Here, we reveal a two-dimensional type I superionic conductor, α-KAg3Se2, by scattering techniques and complementary simulations. Quasi-elastic neutron scattering and ab initio molecular dynamics simulations confirm that the superionic Ag+ ions are confined to subnanometre sheets, with the simulated local structure validated by experimental X-ray powder pair-distribution-function analysis. Finally, we demonstrate that the phase transition temperature can be controlled by chemical substitution of the alkali metal ions that compose the immobile charge-balancing layers. Our work thus extends the known classes of superionic conductors and will facilitate the design of new materials with tailored ionic conductivities and phase transitions.
| Type: | Article |
|---|---|
| Title: | A two-dimensional type I superionic conductor |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41563-021-01053-9 |
| Publisher version: | https://doi.org/10.1038/s41563-021-01053-9 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Atomistic models, Phase transitions and critical phenomena, Solid-state chemistry, Structure of solids and liquids |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10133249 |
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