Comparative Studies on Electronic Structures and Surface Acoustic Wave Properties of (Ca, Sr, Pb)<sub>3</sub>Ga<sub>2</sub>Ge<sub>3</sub>O<sub>14</sub> Piezoelectric Crystals
Bibliographic record
Abstract
The electronic structural and surface acoustic wave (SAW) properties of Ca3Ga2Ge3O14 (CGG), Sr3Ga2Ge3O14 (SGG) and Pb3Ga2Ge3O14 (PGG) crystals have been investigated. The first-principle calculations show that CGG and SGG have similar electronic structure properties, the remarkable difference between PGG and another two crystals is the absence of lower part of valence band. Both the calculated effective charges and bond populations show that there is considerable covalency between cations and O atom. The calculated SAW results show that PGG has the lowest velocities because of its highest density, SGG has the highest electromechanical coupling coefficients, CGG and SGG have more zero power flow angles and negligible diffraction angles than PGG crystal. Some promising cut-types such as Y-cut 148o of SGG, X-cut 154o of CGG and Y-cut 0o of PGG have been selected for their SAW applications.
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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 | 0.006 | 0.003 |
| Meta-epidemiology (narrow) | 0.007 | 0.006 |
| Meta-epidemiology (broad) | 0.009 | 0.002 |
| Bibliometrics | 0.004 | 0.009 |
| Science and technology studies | 0.004 | 0.006 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.006 | 0.005 |
| Research integrity | 0.004 | 0.009 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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".