Magnesium-doped biphasic calcium phosphate (Mg-BCP) was synthesized through sol-gel method using calcium nitrate tetrahydrate and di-ammonium hydrogen phosphate as the precursors. Magnesium nitrate hexahydrate was used as the source of the dopant; magnesium concentration was varied between 0.5 to 15 mo%. The monomers were heated in an ammonium solution until a white gel formed. The obtained gel was then dried and subsequently subjected to 500 - 900 ºC calcination. Morphological evaluation by SEM measurement shows that the particles of Mg-BCP are tightly agglomerated, globular in shape with primary particulates of 50-200 nm diameters. Successful incorporation of Mg into BCP lattice structure was confirmed by higher crystallinity of Mg-BCP and by shifting of tricalcium phosphate (TCP) peaks in XRD patterns to higher 2q angles as the increased Mg content. No hydroxyapatite (HA) peak shifted in the XRD patterns. Doping magnesium into BCP particles caused fusion of particles leading to more progressive densification of particles as shown by higher concentration magnesium doping. This result is in good agreement with the FESEM analysis showing larger Mg-BCP particles as the increased dopant concentration. XRD and FTIR measurement showed that the increment of crystallinity is directly proportional to the amount of the dopant showing a sintering additive properties by the addition of  magnesium. Both analyses also revealed that TCP appeared only after calcination of 700 ºC and above. Preliminary test on powder performance was done by making aqueous slurry of the powder. Soaking cellulosic sponge into the stable slurry followed by drying and burning at 1250ºC gave porous bodies with high consistency macro- and micropores. With macropores of 100-500 microns diameter, the samples are applicable for human spongy bone substitutes. Surprisingly, doping 10 mol% of magnesium has increased the compressive strength by over 10 times compared to pure BCP (0.4 MPa) to 5 MPa.

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