Ab Initio structure determination of vaterite by automated electron diffraction.

Area of Science:

• Mineralogy
• Crystallography
• Geochemistry

Background:

• Vaterite (CaCO3) is a calcium carbonate polymorph with historical significance and roles in weathering and biomineralization.
• Previous studies were hindered by the nanosized nature of vaterite crystals, making structure determination difficult.
• The structure of vaterite has been a subject of extensive discussion in inorganic chemistry.

Purpose of the Study:

• To determine the crystal structure of vaterite.
• To overcome limitations posed by nanocrystalline vaterite for structural analysis.

Main Methods:

• Automated electron diffraction tomography was employed.
• Structure determination was performed on 50 nm sized vaterite nanocrystals.

Main Results:

• The crystal structure of vaterite was successfully solved.
• This was achieved using automated electron diffraction tomography on nanoscale crystals.

Conclusions:

• The crystal structure of vaterite is now known.
• This advancement enables a deeper understanding of vaterite's role in natural processes.