Superlattice Ordering of Mn, Ni, and Co in Layered Alkali Transition Metal Oxides with P2, P3, and O3 Structures
Bibliographic record
Abstract
Na 2/3 Ni 1/3 Mn 2/3 O 2 adopts a layered structure (P2) where the Ni and Mn cations form an ordered arrangement with a √3a × √3a superlattice. The ordered superlattice is preserved in T2-structure Li 2/3 Ni 1/3 Mn 2/3 O 2 prepared from the Na-containing parent phase by ion exchange. In attempts to improve the electrochemical properties of Li 2/3 Ni 1/3 Mn 2/3 O 2, we have investigated the effect of Co substitution for Ni in the parent phase. Using X-ray and neutron diffraction, it is shown that increasing amounts of Co first weaken and then suppress the superlattice ordering in the transition metal layers. For x ≤ 1/12 in Na 2/3 [Co x Ni 1/3 - x Mn 2/3 ]O 2 the superlattice persists, but for x ≥ 1/6 the superlattice is not observed. During ion exchange to make lithium-containing materials, only samples with well-developed superlattices result in crystalline products; otherwise, a stacking-faulted O2-type structure is obtained. The ordering of transition metals in transition metal layers was also found in P3−Na 2/3 [Ni 1/3 Mn 2/3 ]O 2 and O3−Li 2/3 [Ni 1/3 Mn 2/3 ]O 2, but not in O3−Na[Ni 1/2 Mn 1/2 ]O 2 . The necessary conditions for superlattice ordering of transition metal atoms in the transition metal layers are discussed.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".