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It was found by the IR spectra that absorption by OH stretching (3600cm-1) decreased with increase of yttrium content and weak absorption peaks of oxyhydroxyapatite appeared in Yx-Ca-HAp. It was confirmed by XRD analysis that structure of Yx-Ca-HAp consisted of only apatitic phase.Electrical conductivity increased with yttrium concentration in the region x=0-0.7, and it decreased abruptly with yttrium content to x=1.0. In the region btween x=1.0 and 2.0, it increased slightly with content of Y3+. Calculated activation energies of conduction of the samples in the region between x=1.0 and 2.0 were larger than that of ones in the other region (x≤0.7).The above results suggests that the conduction mechanism of the samples in the low Y3+ concentration region (x≤0.7) is different from that of the other (x≥1.0).

Electrical Properties of Apatite Ceramics with a Microstructure Controlled by Y<sup>3+</sup> Substitution