Abstract: For the purpose of preparing pillared phosphates, the intercalation of n-alky-lamine and n-amino-alcohol in layered α-Zr(HPO₄)₂·H₂O(α-ZrP) and its effect on the struc-ture and properties of the layered phosphate have been investigated in detail. It was found that the delamination degree is related with the nature and the amount of amine added, and the extent of HPO₄^2- hydrolysis is dependent both on the basicity of the amine and the delam-ination degree.The delaminated sheets are metastable, and they may recover their ordered arrangement and experience phase transformations in air.The XRDresults and the approxi-mate calculation of the model structures of the intercalates show that a bilayer orientation of the n-alkylamine and n-amino-alcohol molecules is formed when the intercalates are saturat-ed- After long time exposure in air, the intercalates of methylamine and ethylamlne will lose about 50% of the amine and transfer to a monolayer orientation, but the intercalates of n-propylamine, n-butylamine and n-animo-alcohol still keep a bilayer orientation.

Key words: Layered zirconium phosphate, Delamination, Intercalate phase transformation, HPO₄^2- hydrolysis