Orientational disorder and phase transitions in crystals of (NH4)2NbOF5
2008
Phase Changes in (NH4)2NbOF5 Crystals
publication
Evidence: moderate
Author Information
Author(s): Udovenko Anatoly A., Laptash Natalia M.
Primary Institution: Institute of Chemistry, Far Eastern Branch of RAS
Hypothesis
The structural phase transitions in (NH4)2NbOF5 are due to dynamic changes in its structural units as temperature decreases.
Conclusion
The study reveals that (NH4)2NbOF5 undergoes two phase transitions, leading to different structural orders at lower temperatures.
Supporting Evidence
- The compound was synthesized in a single-crystal form and analyzed at three temperatures.
- Dynamic changes in the structural units were observed as the temperature decreased.
- The study identified O and F atoms in the disordered structure using X-ray diffraction.
Takeaway
When it gets colder, the structure of (NH4)2NbOF5 changes in a way that makes it more organized.
Methodology
X-ray diffraction was used to determine the structures of (NH4)2NbOF5 at three different temperatures.
Limitations
The study did not observe a second harmonic generation response due to twinning in the structures.
Digital Object Identifier (DOI)
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