Hydrothermal Synthesis of Open-Framework Borophosphates with Tunable Micropore Sizes, Crystal Morphologies, and Thermal Stabilities
Bibliographic record
Abstract
Thermal stabilities of zeolitic frameworks are important parameters for many applications. Two decades of research have produced only a very small number of zeolitic borophosphates such as Na 2 [VO(B 2 O)(PO 4 ) 2 (HBO 3 )]· x H 2 O ( x ≈ 2.92) (denoted as B 3 P 2 ), which shows the onset dehydration and a complete decomposition at 200 and 400 °C, respectively. In order to enhance thermal stabilities of borophosphate frameworks, a water-deficient hydrothermal route with phosphoric acid as the sole solvent has been developed and led to controlled syntheses of B 3 P 2 and a new vanadium borophosphate, K 1.33 Na 0.67 [VO(B 2 O)(PO 4 ) 2 (HPO 4 )]· x H 2 O ( x ≈ 1.63) (denoted as B 2 P 3 ). The latter is the first-ever borophosphate possessing the zeolite RHO-type net and is characterized by superlarge spherical cages, including 16-ring and 8-ring channels along the axes and 12-ring channels along the diagonals of the cubic cell. The new compound B 2 P 3 has larger structural cages and higher thermal stability than B 3 P 2, where the enhanced thermal stability is attributable to different bonding arising from the substitution of [BO 2 (OH)] by [PO 3 (OH)] in the framework. This is the first demonstration that the micropore size, crystal morphology, and thermal stability of zeolitic borophosphates can be tuned by changing the fundamental building units of their frameworks via adjusting the B/P ratios in the starting materials.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".