Substitution Model of Silicate Ions in β-Tricalcium Phosphate Structure

Abstract

Taking account the charge balance, β-tricalcium phosphate (β-TCP) powders co-doped with Mg²⁺ ions and SiO₄^4- ions were synthesized via solid-state reaction, and then the substitution mode of each metal ions and their characteristics were investigated. Mg²⁺ ions were substituted for Ca(5) and Ca(4) sites up to 13.64 mol%, and the excess Mg²⁺ ions replace additionally for vacancy in order to substitute SiO₄^4- ions with changing the occupancy factor and keeping the charge balance. The substitution of Mg²⁺ ions and SiO₄^4- ions into β-TCP structure induced the improvement of the mechanical properties and the inhibition of the bioresorbability.