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Unveiling Structural Disorders in Honeycomb Layered Oxide: Na2Ni2TeO6
preprintsubmitted on 15.11.2020, 02:24 and posted on 16.11.2020, 11:42 by Titus Masese, Yoshinobu Miyazaki, Josef Rizell, Godwill Mbiti Kanyolo, Teruo Takahashi, Miyu Ito, Hiroshi Senoh, Tomohiro Saito
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.