Conductivity of Potassium and Rubidium Dihydrogen Phosphates at High Temperature and Pressure
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Bibliographic record
Abstract
The high-temperature behavior of KH 2 PO 4 and RbH 2 PO 4 has been investigated by several methods. Simultaneous differential scanning calorimetry and thermal gravimetry, combined with evolved gas analysis, was carried out from 25 to 500 °C under ambient pressure. The initial dehydration events in KH 2 PO 4 and RbH 2 PO 4 occur at 233 and 257 °C, respectively, with no indication of either solid−solid or solid−liquid transitions prior to weight loss. Application of pressure suppresses this dehydration. Impedance spectroscopy performed under 1 GPa revealed a highly reproducible superprotonic phase transition in RbH 2 PO 4 at 327 °C, at which the conductivity increased several orders of magnitude to a value of 6.8 × 10 - 2 Ω - 1 cm - 1 at 340 °C. The activation energy for proton transport in the superprotonic phase is Δ H a of 0.232 ± 0.008 eV and the pre-exponential factor A, 3.4 ± 0.6 × 10 3 Ω - 1 cm - 1 K. No superprotonic solid−solid phase transition was observed in KH 2 PO 4 . However, a sharp increase in conductivity to a value of 1.8 × 10 - 2 Ω - 1 cm - 1 at 345 °C was observed upon melting ( T m ∼ 325 °C). The liquid phase exhibited Arrhenius behavior comparable to that of superprotonic RbH 2 PO 4, with Δ H a = 0.227 ± 0.004 eV and A = 5. 2 ± 0.5 × 10 3 Ω - 1 cm - 1 K.
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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) | 0.001 | 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 it