Structural Study of Metakaolin-Phosphate Geopolymers Prepared with Wide Range of Al/P Molar Ratios.

A clear trend was observed: samples with low Al/P ratios (P-0.8, P-1) exhibited dense, compact structures with limited porosity, while those with higher Al/P ratios (P-3, P-4) exhibited increasingly loose and porous networks.

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In relation to existing structural models, our experimental results can be interpreted as follows: Single-network Si–O–P–O–Al with dispersed amorphous silica: The 29 Si MAS NMR spectra showed a trend towards Q 4 (0Al) sites, consistent with amorphous silica formation.

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