{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T14:59:57Z","timestamp":1790693997709,"version":"4.1.0"},"reference-count":36,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T00:00:00Z","timestamp":1789516800000},"content-version":"vor","delay-in-days":15,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Small Science"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:p>\n                    Elucidating the interplay between anion dynamics and cation transport is essential for the rational design of solid\u2010state ionic conductors. Here, we investigate the relationship between local anion motion and long\u2010range  transport in  by combining quasielastic neutron scattering (QENS) and neutron spin\u2010echo (NSE) spectroscopy with complementary thermal, structural, and electrochemical investigations. Time\u2010of\u2010flight QENS analysis reveals ultrafast reorientational motion of  units within the crystalline lattice, characterized by a low rotational activation barrier of \u223c0.16\u2009eV. This barrier is substantially lower than the  transport activation energy (\u223c0.26\u2009eV), demonstrating that thermally activated  reorientation provides a dynamic pathway that promotes  hopping through the lattice. In contrast,  anions exhibit limited quasielastic broadening, indicating more restricted dynamics. Upon melting, the emergence of\n                    <jats:italic>Q<\/jats:italic>\n                    \u2010dependent quasielastic broadening reveals translational diffusion of  species, yielding a diffusion coefficient of \u223c. This value closely agrees with the  diffusion coefficient obtained from ionic conductivity measurements, evidencing a transition from rotation\u2010assisted  migration in the solid state to coupled cation\u2013anion diffusion in the molten phase. Complementary NSE measurements directly capture long\u2010range  motion on nanosecond timescales, providing a unified molecular\u2010level picture of how anion dynamics regulate ion transport in mixed\u2013anion complex hydrides.\n                  <\/jats:p>","DOI":"10.1002\/smsc.70408","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T05:50:29Z","timestamp":1789624229000},"source":"Crossref","is-referenced-by-count":0,"title":["Disentangling Multiscale Cation\u2013Anion Dynamics in Li\n                    <sub>4<\/sub>\n                    (BH\n                    <sub>4<\/sub>\n                    )(NH\n                    <sub>2<\/sub>\n                    )\n                    <sub>3<\/sub>\n                    Using Quasielastic Neutron Scattering"],"prefix":"10.1002","volume":"6","author":[{"given":"Mohsin","family":"Abbas","sequence":"first","affiliation":[{"name":"Institute of Hydrogen Technology Helmholtz\u2010Zentrum Hereon  Geesthacht Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5027-4761","authenticated-orcid":false,"given":"Fahim","family":"Karimi","sequence":"additional","affiliation":[{"name":"Institute of Hydrogen Technology Helmholtz\u2010Zentrum Hereon  Geesthacht Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicolas","family":"De Souza","sequence":"additional","affiliation":[{"name":"Australian Centre for Neutron Scattering ANSTO  Lucas Heights New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dehong","family":"Yu","sequence":"additional","affiliation":[{"name":"Australian Centre for Neutron Scattering ANSTO  Lucas Heights New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5542-0059","authenticated-orcid":false,"given":"Peter","family":"Fouquet","sequence":"additional","affiliation":[{"name":"Institut Laue\u2010Langevin  Grenoble France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9521-3273","authenticated-orcid":false,"given":"Thomas","family":"Klassen","sequence":"additional","affiliation":[{"name":"Institute of Hydrogen Technology Helmholtz\u2010Zentrum Hereon  Geesthacht Germany"},{"name":"Helmut Schmidt University University of the Federal Armed Forces Hamburg  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0706-6972","authenticated-orcid":false,"given":"Claudio","family":"Pistidda","sequence":"additional","affiliation":[{"name":"Institute of Hydrogen Technology Helmholtz\u2010Zentrum Hereon  Geesthacht Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,16]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.enpol.2010.11.040"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11475"},{"key":"e_1_2_9_4_1","volume-title":"Metal Hydrides","author":"Mueller W. 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