Effects of sintering and pressing conditions on the properties of manganese ferrite
Bibliographic record
Abstract
In the present work, zinc-manganese ferrite powder with stoichiometric composition Fe2O3-0.5ZnO-0.5Mn3O4 was prepared by mixing the constituent oxides and sintering them. The samples were shaped by two methods: dry powder pressing and slurry pressing with 10% water by weight (after drying), with a pressure of 50 MPa. The samples were sintered in a tube furnace in different oxidizing, neutral, and reducing atmospheres at 1050 °C. Under a neutral argon atmosphere, the porosity was reduced by about 2%, compared to the sintering samples in the oxide state. In order to achieve zero porosity, pressing using a slurry is more effective in small-sized parts. Samples sintered in nitrogen atmosphere, at the same temperature and sintering conditions, had smaller grain sizes compared to those sintered in hydrogen and oxide atmospheres. Based on microstructure comparison, sintering in a hydrogen atmosphere probably led to the formation of the gamma phase in ferrite. The change in magnetic permeability of the samples made by slurry and pressing methods was not significant; with increasing frequency, the permeability increased by about 20% in both cases.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".