Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
ROSSETO, Renato; SANTOS, Ádamo C. M. A. dos and GALEMBECK, Fernando. Hydrous non-crystalline phosphates: structure, function and a new white pigment. J. Braz. Chem. Soc. [online]. 2006, vol.17, n.8, pp. 1465-1472. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532006000800002.
Hydrated non-crystalline inorganic solids are often neglected due to the limited comprehension of their complex physico-chemical and structural properties. However, these non-crystalline materials exhibit a rich and varied chemistry, interesting for scientific and technological reasons. This work reviews general aspects of formation of hydrated non-crystalline solids, with special emphasis on aluminum (poly)phosphate materials. Precursors and concentration variations, temperature, ageing and reaction pH are trivial synthetic variables, but they promote the formation of a myriad of compounds adequate for many functions. Amorphous aluminum phosphates are widely employed in different industrial applications, providing good examples of the potential of hydrous amorphous solids.
Keywords : non-crystalline solids; ionic solids; aluminum phosphate; amorphous polyphosphate.