Nucleation of amorphous precursor in magnesium phosphate cements: Clues to the reaction pathway

In-situ X-ray techniques indicated that in its early stages, the reaction pathway of magnesium phosphate cements involves the formation of an amorphous precursor, first detected as nanoparticles which organize themselves into larger domains. Crystallization occurs from this precursor (already containing the structural motives of the crystalline counterpart) by increasing the long-range order through relatively minor structural rearrangements. The process is compatible with multi-steps nucleation involving non-classical mechanisms, as observed in Ca carbonates and phosphates, therefore, indicating ways to control the transformation to improve cement design.

Automated summary

In-situ X-ray techniques revealed that the reaction pathway of magnesium phosphate cements involves the formation of an amorphous precursor in its early stages, which then crystallizes by increasing long-range order through relatively minor structural rearrangements. The process is compatible with multi-step nucleation involving non-classical mechanisms, similar to what is observed in Ca carbonates and phosphates, providing insights into controlling the transformation to enhance cement design.