Thermoelectric properties and transport phenomena in (Bi/sub 1-x/Sb/sub x/)/sub 2/(Te/sub 1-y/Se/sub y/)/sub 3/ quaternary n-type alloys produced by powder metallurgy and extrusion
Bibliographic record
Abstract
The use of (Bi/sub 1-x/Sb/sub x/)/sub 2/(Te/sub 1-y/Se/sub y/)/sub 3/ solid solution alloys instead of the Bi/sub 2/Te/sub 3/ binary compound allows a significant increase of its thermoelectric performance. This improvement is mainly related to the reduction of thermal conductivity of the crystal lattice due to increased phonon scattering obtained from the alloying effect. However the optimum amount of Sb and Se resulting in higher alloy performance remains uncertain. Moreover, it is not clear if the reduction of mobility of free charge carriers in alloys containing large amounts of Sb and Se is the only cause of thermoelectric performance degradation of such alloys. Other phenomena have been suggested to explain this behavior. In this research project, a series of quaternary alloys of n-type (Bi/sub 1-x/Sb/sub x/)/sub 2/(Te/sub 1-y/Se/sub y/)/sub 3/ have been characterized with Sb and Se content varying from 0 to 10%. The specimens were produced by mechanical alloying of powders and hot extrusion. The thermoelectric properties have been studied in the temperature range from 230 to 350 K. The mobility and concentration of charge carriers were evaluated as a function of temperature from 15 to 300 K. The results indicate that, for quaternary alloys in the higher end of the concentrations of Se and Sb studied here, the hypothesis of charge carrier mobility degradation due only to alloying effect is not sufficient to explain the data. We will discuss the effect of additional generation of defect complexes for these cases.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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; 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".