Synthesis of nanosized powders and coatings of calcium phosphates

Hydroxyapatite powders with a particle size of nearly 100 nm, i.e., rather close to bone crystals shaped as 60 x 20 x 5-nm flattened prisms, were synthesized by the pyrolysis of a solution of calcium oleate in tributylphosphate. The possibility of synthesizing hydroxyapatite coatings on different ceramic materials was demonstrated. The pyrolysis of a solution of strontium oleate in tributylphosphate was established to produce the Sr10(PO4)(6)(OH)(2) compound isotypical to hydroxyapatite, which in turn creates prospects for synthesizing materials based on hydroxyapatite with some calcium atoms substituted by strontium.