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Updated: Sep 19, 2025
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
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High-Pressure X‑ray Diffraction Investigation of Fe0.9Al0.1VO4
Vinod Panchal1, Pablo Botella2, Neha Bura2
1Department of Physics, Royal College, Mira Road, Thane, Mumbai 401107, India.
Summary
Aluminium incorporation alters the high-pressure structural behavior of iron vanadate, revealing distinct phase transitions and compressibility compared to its non-aluminated counterpart. These findings impact potential applications in photocatalysis and batteries.
Area of Science:
- Materials Science
- Solid State Chemistry
- Crystallography
Background:
- Understanding the high-pressure behavior of vanadates is crucial for their application in energy storage and catalysis.
- Cationic composition significantly influences the structural phase transitions of metal oxides under pressure.
Purpose of the Study:
- To investigate the in situ high-pressure structural phase transitions of triclinic Fe0.9Al0.1VO4 using powder X-ray diffraction.
- To compare the pressure-induced structural evolution of Fe0.9Al0.1VO4 with that of FeVO4.
Main Methods:
- In situ high-pressure powder X-ray diffraction (HP-PXRD) up to 11 GPa.
- Analysis of structural sequences, phase transitions, and compressibility.
- Crystallographic structure determination and refinement.
Main Results:
- Fe0.9Al0.1VO4 exhibits a different structural sequence under pressure compared to FeVO4.
- Two distinct phase transitions were observed: a first-order transition at 2.85 GPa (triclinic to triclinic) with a ~9% volume collapse, and a second transition starting at 6.1 GPa to a monoclinic phase (P2/c).
- Al incorporation leads to variations in structural sequence and compressibility, with phase coexistence observed upon pressure release.
Conclusions:
- The cationic composition, specifically Al incorporation, significantly modifies the high-pressure phase behavior and compressibility of iron vanadate.
- The observed structural changes suggest potential tuning of electronic properties, impacting applications in areas like photocatalysis and batteries.
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