Impact of electron irradiation on the structural and optical properties of crystalline Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> memory material: an experimental study
Bibliographic record
Abstract
Abstract This study investigates the structural and optical responses of crystalline Ge2Sb2Te5 (GST), a key phase-change memory material, under electron irradiation in the energy range of 1-4 MeV. Structural and chemical modifications were analyzed by using X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS), while optical reflectivity was measured via UV-vis-NIR spectrophotometry. XRD results showed no major phase transition, suggesting structural stability of c-GST under irradiation. However, Raman and XPS analyses revealed notable sublattice-specific damage, particularly in the GeTe4 units, indicating higher susceptibility of Ge-Te bonds compared to Te-Te and Sb-Te bonds. Structural reorganization and partial bond recovery were observed at higher irradiation energies. Optical reflectivity declined significantly at lower energies due to defect-induced scattering but partially recovered at 4 MeV, suggesting potential self-healing effects. These findings enhance understanding of irradiation tolerance in GST and underscore its viability for radiation-resistant phase-change memory applications, especially in harsh environments such as outer space.
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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 | 0.000 |
| 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) | 0.002 | 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".