Trivalent‐Cation‐Substituted Calcium Oxyhydroxyapatite

Abstract

Synthesis of stable oxy‐ and oxyhydroxyapatkes [(Ca,M)‐Ap] was attempted by substitution of Ca 2+ with M 3+ (M = Al, Y) assuming the composition Ca 10‐x M x (PO 4 ) 6 (OH) 2‐x O x . Yttrium‐calcium oxyhydroxyapatite was successfully obtained. Its structure was analyzed and confirmed by X‐ray diffraction and infrared spectroscopy. Dielectric dispersion and absorption were not so distinct in (Ca,Y)‐Ap as in hydroxyapatite (Ca‐Ap). The ac electrical conductivity of (Ca 10‐x ,Y x )‐Ap was found to decrease with increasing x. These results are discussed in terms of a proposed charge transport mechanism.