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Influence of the Precursor Structure on the Formation of Tungsten Oxide Polymorphs
Mikkel Juelsholt1, Olivia Aalling-Frederiksen1, Troels Lindahl Christiansen1
1Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
Inorganic Chemistry
|September 1, 2023
Summary
Material precursor structure dictates crystal formation during hydrothermal synthesis. Controlling precursor clusters allows targeted synthesis of specific tungsten oxide phases, like ammonium tungsten bronze.
Area of Science:
- Materials Science
- Solid State Chemistry
- Crystallography
Background:
- Understanding material nucleation is key for custom material synthesis.
- The influence of precursor solution structure on material formation pathways is poorly understood.
Purpose of the Study:
- To investigate how precursor solution structure affects crystal structure formation during hydrothermal synthesis of tungsten oxides.
- To demonstrate the role of precursor cluster structure in directing crystalline phase outcomes.
Main Methods:
- Utilized in situ total scattering techniques.
- Investigated hydrothermal synthesis of tungsten oxides from ammonium metatungstate and ammonium paratungstate.
Main Results:
- The precursor cluster structure directly influences the final crystalline phase formed.
- Metatungstate clusters lead directly to hexagonal ammonium tungsten bronze.
- Paratungstate B clusters result in a metastable pyrochlore intermediate before transforming to the bronze phase.
Conclusions:
- Precursor cluster structure at crystallization directly controls the formed crystalline phase.
- Precursor structure can be manipulated to target specific crystalline phases of interest in tungsten oxide synthesis.
