Synthesis of Hydrated Aluminum Phosphate, AlPO<sub>4</sub>·1.5H<sub>2</sub>O (AlPO<sub>4</sub>−H<sub>3</sub>), by Controlled Reactive Crystallization in Sulfate Media
Bibliographic record
Abstract
A new method for the synthesis of hydrated aluminum phosphate, AlPO 4 ·1.5H 2 O, in a semibatch reactor is reported. The synthesis involves direct reactive crystallization induced by pH adjustment to a predetermined supersaturation level. Precipitation was conducted in sulfate-based solutions with Al(III):P(V) molar ratio of 1 and at 95 °C. Homogeneous precipitation tests led to the definition of the metastable zone of aluminum phosphate. This zone was used to design the supersaturation-controlled seeded test. XRD, TGA, and chemical analysis confirmed the product to be AlPO 4 ·1.5H 2 O. SEM and particle size analysis revealed the product to consist of aggregates of submicron-size crystallites of 3.5 μm average size (homogeneously formed product) grown to 16.5 μm after three cycles of seeded crystallization.
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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 | 0.004 | 0.011 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.003 | 0.004 |
| Insufficient payload (model declined to judge) | 0.000 | 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; 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".