Effect La3+ doping on structure and properties of composite biomaterials based on biogenic hydroxyapatite


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Modern Problems in Physical Materials Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #21


Bioactive composite materials biogenic hydroxyapatite /glass (50% (wt.) of glass) doped with La3+ in the amount of 5—15% (wt) have been prepared. It was established that introduction of La3+ additive positive influenced on the process of structure formation during sintering of composites, increasing the viscosity of the glass and reducing foaming that is typical for one-stage method of composite preparation. But introduction of La3+ leads the formation of secondary phases during sintering due to the interaction of crystalline and amorphous components. Doped component increases the porosity of composite materials biogenic hydroxyapatite/glass up to 68%, but material with predominantly open porosity can be obtained only at 600 ° С Compressive strength of composites doped La3+ is 27—59 MPa and is close to the strength ofcancellous bone. Biosolubility of composite materials depends on modeling fluid, amount of doped additive and sintering temperature.