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Updated: Jul 16, 2025
08:49
Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
Published on: December 4, 2014
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Study on the Fluorination Process of Sc2O3 by NH4HF2
Zhi Li1, Chengwei Zhan1, Huan Yu1
1Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
Materials (Basel, Switzerland)
|September 9, 2023
Summary
High-purity scandium fluoride (ScF3) was synthesized from scandium oxide (Sc2O3) using ammonium bifluoride (NH4HF2). Optimal conditions yielded 99.997 wt.% pure ScF3, crucial for advanced alloy applications.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Rare-Earth Chemistry
Background:
- Rare-earth fluorides are essential for high-purity alloy preparation and emerging technologies.
- Efficient synthesis methods for high-purity scandium fluoride (ScF3) are critical.
Purpose of the Study:
- To investigate the fluorination of scandium oxide (Sc2O3) using ammonium bifluoride (NH4HF2) to produce ScF3.
- To determine the optimal conditions (temperature, time, reactant ratio) for maximizing fluorination rate and purity.
Main Methods:
- Thermodynamic calculations to confirm reaction feasibility.
- Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) for thermal stability.
- Powder X-ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), and High-Resolution Transmission Electron Microscopy (HRTEM) for product characterization.
Main Results:
- Fluorination initiates at room temperature, progressing through intermediate phases ((NH4)3ScF6, NH4ScF4, (NH4)2Sc3F11) to ScF3 with increasing temperature.
- Fluorination rate and purity are enhanced by higher temperatures and longer reaction times.
- Achieved 99.997 wt.% purity ScF3 by fluorinating at 400 °C for 2 hours.
Conclusions:
- The fluorination of Sc2O3 with NH4HF2 is a viable route to high-purity ScF3.
- Optimized temperature and time are key to achieving high purity for alloy applications.
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