Near‐Zero Thermal Expansion in <scp> <scp>In</scp> </scp> ( <scp> <scp>HfMg</scp> </scp> ) <sub>0.5</sub> <scp> <scp>Mo</scp> </scp> <sub>3</sub> <scp> <scp>O</scp> </scp> <sub>12</sub>
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
In ( HfMg ) 0.5 Mo 3 O 12 , which can be considered as a 1:1 mole ratio solid solution of the low‐positive thermal expansion material HfMgMo 3 O 12 and the low‐negative thermal expansion (NTE) material In 2 Mo 3 O 12 was prepared. From DSC and XRPD results, we show that In ( HfMg ) 0.5 Mo 3 O 12 exists in a monoclinic ( P 2 1 / a ) structure at low temperature and undergoes a phase transition at ~425 K to an orthorhombic phase ( Pnma ), with an associated enthalpy change of 0.89 kJ mol −1 . Thermal expansion is large and positive in the low‐temperature monoclinic phase (average α ℓ = 16 × 10 −6 K −1 and 20 × 10 −6 K −1 , from dilatometry and XRPD , respectively). Remarkably, this material has a near‐zero thermal expansion (ZTE) coefficient over the temperature range ~500 to ~900 K in the high‐temperature orthorhombic phase, both intrinsically and for the bulk sample. The average linear intrinsic ( XRPD ) value is α ℓ = −0.4 × 10 −6 K −1 , and the average bulk (dilatometric) value is α ℓ = 0.4 × 10 −6 K −1 with an uncertainty of ± 0.2 × 10 −6 K −1 . The slight difference between intrinsic and bulk thermal expansion is attributed to microstructural effects. XRPD results show that the thermal expansion is more isotropic than for the parent compounds HfMgMo 3 O 12 and In 2 Mo 3 O 12 .
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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 | 0.019 | 0.052 |
| Meta-epidemiology (narrow) | 0.010 | 0.009 |
| Meta-epidemiology (broad) | 0.012 | 0.010 |
| Bibliometrics | 0.004 | 0.012 |
| Science and technology studies | 0.006 | 0.009 |
| Scholarly communication | 0.005 | 0.010 |
| Open science | 0.014 | 0.007 |
| Research integrity | 0.005 | 0.016 |
| Insufficient payload (model declined to judge) | 0.000 | 0.004 |
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