Thermal, conductivity, NMR, and Raman spectroscopic measurements and phase diagram of the Cs2S2O7-CsHSO4 system
Bibliographic record
Abstract
The conductivity of the binary system Cs 2 S 2 O 7 −CsHSO 4 has been measured at 20 different molten compositions in the full composition range and in the temperature range 430−750 K. From the obtained liquidus−solidus phase transition temperatures, the phase diagram has been constructed. It is of the simple eutectic type with the composition X(CsHSO 4 ) = 0.86 and temperature of fusion of 470 K for the eutectic. The previously unpublished temperature of fusion of CsHSO 4 was found to be 491.7 K. The experimental phase diagram is in good accordance with a calculated diagram based on measured thermodynamic properties of the pure compounds and the heat of liquid−liquid mixing measured for X(CsHSO 4 ) = 0.5 and 1.0. 133 Cs and 17 O NMR spectra and Raman spectra of the liquid Cs 2 S 2 O 7 −CsHSO 4 system indicate the presence of a temperature sensitive equilibrium 2HSO 4 - ⇌ S 2 O 7 2- + H 2 O where the water molecules are strongly associated in the melt. Fast exchange reactions take place between the species present, leading to the observed 17 O NMR single line with an averaged chemical shift. Super-ionic and thermodynamic stable phases and the temperatures of phase transitions have been identified from the NMR measurements on CsHSO 4, Cs 2 S 2 O 7, and Cs 2 S 2 O 7 −CsHSO 4 mixtures. For 11 selected compositions covering the entire composition range of the Cs 2 S 2 O 7 −CsHSO 4 binary system, the conductivity of the molten state has been expressed by equations of the form κ( X ) = A ( X ) + B ( X )( T − T m ) + C ( X )( T − T m ) 2 where T m is the intermediate temperature of the measured temperature range and X is the initial mol fraction of CsHSO 4 .
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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".