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Abstract
Honeycomb
layered oxides have garnered tremendous research interest in a wide swath of
disciplines owing to not only the myriad physicochemical properties they
exhibit, but also due to their rich crystal structural versatility. Herein, a
comprehensive crystallographic study of a sodium-based Na2Ni2TeO6
honeycomb layered oxide has been performed using atomic-resolution transmission
electron microscopy, elucidating a plethora of atomic arrangement (stacking)
disorders in the pristine material. Stacking disorders in the arrangement
honeycomb metal slab layers (stacking faults) occur predominantly perpendicular
to the slabs with long-range coherence length and enlisting dislocations in
some domains. Moreover, the periodic arrangement of the distribution of alkali
atoms is altered by the occurrence of stacking faults. The multitude of
disorders innate in Na2Ni2TeO6 envisage broad
implications in the material functionalities of related honeycomb layered oxide
materials and will bolster renewed interest in their material science.
