English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In the quest of finding novel and efficient batteries, a great interest hasraised in K-based honeycomb layer oxide materials both for their fundamentalproperties and potential applications. A key issue in the realization ofefficient batteries based on such compounds, is to understand the K-iondiffusion mechanism. However, investigation of potassium-ion (K$^+$) dynamicsin materials using magneto-spin properties has so far been challenging, due toits inherently weak nuclear magnetic moment, in contrast to other alkali ionssuch as lithium and sodium. Spin-polarised muons, having a high gyromagneticratio, make the muon spin rotation and relaxation ($\mu$+SR) technique idealfor probing ions dynamics in weak magneto-spin moment materials. Here we reportthe magnetic properties and K+ dynamics in honeycomb layered oxide material ofthe K$_2$Ni$_2$TeO$_6$ using $\mu$+SR measurements. Our low-temperature$\mu$+SR results together with, with complementary magnetic susceptibility,find an antiferromagnetic transition at 26 K. Further $\mu$+SR studiesperformed at higher temperatures reveal that potassium ions (K$^+$) becomemobile above 250 K and the activation energy for the diffusion process is Ea =121(13) meV. This is the first time that K+ dynamics in potassium-based batterymaterials has been measured using $\mu$+SR. Finally our results also indicatean interesting possibility that K-ion self diffusion occurs predominantly atthe surface of the powder particles. This opens future possibilities forimproving ion diffusion and device performance using nano-structuring.

Magnetism and Ion Diffusion in Honeycomb Layered Oxide K$_2$Ni$_2$TeO$_6$: First Time Study by Muon Spin Rotation & Neutron Scattering