2026-11-03 アルゴンヌ国立研究所（ANL）
When ions hop from one lattice site to another (left), the energy broadening of 4D-QENS (right) shows us which sites they hop between and how fast the hopping rate is. (Image: Raymond Osborn/Argonne National Laboratory)
＜関連情報＞
- https://www.anl.gov/article/argonneled-team-introduces-a-powerful-new-method-for-probing-ionic-conductivity
- https://journals.aps.org/prxenergy/abstract/10.1103/b93d-755s
イオン伝導の相関に関する4次元準弾性中性子散乱（4D-QENS）解析SrCl2 Four-Dimensional Quasielastic Neutron Scattering (4D-QENS) Analysis of Correlated Ionic Conduction in SrCl2
Jared Coles, Omar Chmaissem, Matthew Krogstad, Daniel M. Pajerowski, Feng Ye, Duck Young Chung, Mercouri G. Kanatzidis, Stephan Rosenkranz, and Raymond Osborn
PRX Energy Published: 14 April, 2026
DOI:: https://doi.org/10.1103/b93d-755s
Abstract
Methods of elucidating the mechanisms of fast-ion conduction in solid-state materials are pivotal for advancements in energy technologies such as batteries, fuel cells, sensors, and supercapacitors. In this study, we examine the ionic conduction pathways in single crystal SrCl2, which is a fast-ion conductor above 900 K, using four-dimensional quasielastic neutron scattering (4D-QENS). We explore both coherent and incoherent neutron scattering at temperatures above the transition temperature into the superionic phase to explore the correlated motion of hopping anions. Refinements of the incoherent QENS yield residence times and jump probabilities between lattice sites in good agreement with previous studies, confirming that ionic hopping along nearest-neighbor directions is the most probable conduction pathway. However, the coherent QENS reveals evidence of de Gennes narrowing, indicating the importance of ionic correlations in the conduction mechanism. This highlights the need for improvements both in the theory of ionic transport in fluorite compounds and the modeling of coherent 4D-QENS in single crystals.
