Charge transport anisotropy in hot extruded bismuth telluride: Scattering by acoustic phonons
Bibliographic record
Abstract
A model of the thermoelectric transport properties of hot extruded bulk polycrystalline (HEBP) n-type Bi2Te3 has been developed based on the marked anisotropy of its properties induced by extrusion. HEBP Bi2Te3 is a highly textured material that allows treating electrical and thermal transport in the plane perpendicular to the extrusion axis as approximately isotropic. The model of this transport is based on the simplified electronic density of states suggested by ab initio calculations of the band structure of crystalline Bi2Te3 near the band edges. The proposed model can also be applied to transport along the extrusion axis in a temperature range when there is only one limiting charge carrier scattering mechanism. It provides excellent accord to the Hall effect (perpendicular) and the Harman (along extrusion) measurement of mobility, and the Seebeck coefficient of HEBP n-type Bi2Te3 in the temperature range from ∼200 to 460 K. It can be concluded that acoustic phonon scattering provides the limiting scattering mechanism for this temperature range. The model is also applied to elucidate the important role of thermodiffusion, suggesting that the usual approach to experimentally obtain this contribution to the thermal conductivity can only give approximate rough estimates.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 0.000 |
| 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) | 0.000 | 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".