Accessing Metastable Solid-Solution Nanoparticles from Solution-Phase Condensation Reactions: Applications in High-K Dielectrics, Geopolymerization, and X-Ray Phosphors
Bibliographic record
Abstract
This dissertation focuses on the design, synthesis, and functional applications of ceramic materials prepared with precise compositional, dimensional, and structural control from molecular precursors using a versatile sol—gel condensation process. Three primary thrusts have stemmed from this central idea: (i) mapping the size-dependent phase diagram of HfOv2 and stabilizing the metastable tetragonal phase of HfOv2 at room temperature as a result of dimensional confinement, thereby obtaining a technologically important high-dielectric-constant polymorph that is only accessible above a temperature of 1720°C in the bulk; (ii) developing a method to cross-link plant fibers through creation of siloxane frameworks, resulting in the stabilization of a mechanically resilient load-bearing composite for roadworks in the Alberta Oil Sands; and (iii) stabilizing solid-solution rare earth oxychloride (REOCl) nanocrystals across a broad compositional range to obtain a full palette of X-ray phosphors, allowing for elucidation of activation channels, sensitization mechanisms, and recombination pathways underpinning X-ray-activated optical luminescence. \nThe dissertation develops a versatile synthetic toolbox for defining oxide and oxyhalide frameworks. The choice of molecular precursors and ligands added during synthesis strongly influence kinetics of particle growth and allow for compositional control as well as tunability of particle dimensions. The metastable materials synthesized in this work have allowed for exploration of the size-dependent phase diagram of HfO2 and have enabled the development of quaternary and quintary solid-solution phosphors based on the PbFCl-type LaOCl and GdOCl frameworks.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".