水酸化カルシウムとリン酸からのハイドロキシアパタイトの合成とpH制御による組成の制御

概要

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Ca(OH)_2 and H_3PO_4 were used as starting materials for synthesizing hydroxyapatite (HAp). When the stoichiometric amount of 1 mol/l solution of H_3PO_4 was added dropwise to a Ca(OH)_2 slurry in a N_2 atmosphere, pH of the slurry was shifted from 11.7 to 3.7, and resultant HAp became Ca-deficient. The Ca/P molar ratio of HAp was strongly affected by pH of the reaction slurry. Stoichiometric HAp (Ca/P=1.67) was prepared by keeping the slurry at pH=7.0 with a tris (hydroxymethyl) aminomethane solution (Tris buffer) and by aging for 48 h at 60℃ in a N_2 atmosphere. The Ca/P molar ratio of HAp was regulated by using Tris buffer to 1.66 under pH=6.0 and to 1.68 under pH=8.0, respectively. The stoichiometric HAp was stable up to 1300℃, and the lattice constants of the HAp calcined at 1100℃ were a_0=0.94185(2) nm and c_0=0.68807(2) nm.
社団法人日本セラミックス協会の論文
1993-06-01