Li<sub>2.5</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>: A Room-Temperature Analogue to the Fast-Ion Conducting High-Temperature γ-Phase of Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>
Bibliographic record
Abstract
The structure of the NASICON-like phase Li 2.5 V 2 (PO 4 ) 3 has been determined by X-ray and neutron powder diffraction, demonstrating that it crystallizes in the space group P 2 1 / n ( a = 8.5539(4) Å; b = 8.6099(4) Å; c = 11.9825(5) Å; β = 90.002(7)°). Combined studies using 6,7 Li MAS NMR, EPR, and ac impedance spectroscopy show that this pseudo-orthorhombic lattice represents a room-temperature analogue of the high-temperature orthorhombic phase γ-Li 3 Sc 2 (PO 4 ) 3 . Lithium disorder over partially vacant sites leads to enhanced ion mobility. EPR spectroscopy confirms the presence of localized V 4+ in the lattice, whose short-range order with V 3+ gives rise to five resolvable Li shifts in the 6,7 Li MAS NMR spectrum. These shifts can be rationalized by consideration of the Fermi-contact interactions arising from the difference between V 3+ and V 4+ coupling in the three lithium sites.
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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 | 0.006 | 0.003 |
| Meta-epidemiology (narrow) | 0.009 | 0.010 |
| Meta-epidemiology (broad) | 0.010 | 0.003 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.006 | 0.003 |
| Research integrity | 0.007 | 0.006 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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; both teacher heads agree on what is shown here.
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".