It is important to control the powder conditions, such as porous, globular, etc., for application of such materials. In the fields of the synthesis of inorganic materials, the addition of urea etc. gave some possibility to obtain a large specific surface area, without a change of chemical composition. Materials containing urea became porous by heating because urea decomposed to ammonia and carbon dioxide. In this study, various phosphates were prepared in aqueous solutions with and without the addition of urea. The precipitation obtained was estimated by thermogravimetry-differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The powder properties of phosphates were studied in terms of specific surface area, pore size distribution, particle size distribution, and scanning electron microscopy images. The influence of the added urea is discussed for the development of inorganic phosphate materials.

Keywords: porous material; inorganic phosphate; addition of urea