Influence of admixtures on the crystallization and morphology of AlPO4 crystals

The influence of various uni-, bi-, tri- and tetravalent admixtures on the crystallization and morphology of AlPO₄ has been studied in detail. AlPO₄ crystals were synthesized under hydrothermal conditions. It was found that the phase formation and morphology vary with the type of admixture and its concentration. The crystals were hexagonal, rhombohedral, rounded, irregular, rod shaped and massive in habit. With an increase in the concentration of admixtures, two phases (berlinite and metaphosphates) of the respective admixtures crystallize simultaneously.