通道离子替换磷灰石固溶体比较晶体化学XRD研究

采用单相共沉淀法和隋性气体保护下的固相反应法制备了不同通道离子替换固溶体磷灰石X₁-X₂AP]。利用XRD对通道离子替换磷灰石固溶体进行了比较晶体化学研究,结果表明:晶胞参数随通道离子半径的增大,a₀增大,c₀反而减小,且OH-ClAP和F-OHAP变化呈线性关系,符合Vegard定律,而F-ClAP在富F^-端的变化不呈线性关系;由于PO₄]四面体沿101]方向的滑移,c₀随a₀的变化而变化,且c₀^-2与a₀^-2呈线性关系c₀^-2=-a₀^-2+3.2348]。

XRD Investigation on Comparative Crystal Chemistry of Channel-ions Substituted Apatite Solid Solutions

The channel-ions substituted apatite solid solutions X₁-X₂AP] were synthesized through one-phase copre-cipitating method and solid-phase reaction method in inert gas. Comparative crystal chemistry of the X₁-X₂AP] have been investigated by X-ray diffraction. The results indicated that a₀ increases linearly, but c₀ decreases lin-early with channel-ions radii increasing in the crystal lattice of the OH-ClAP and F-OHAP, and consisted with the vegard rule. In the high-F^- terminals of the F-ClAP, the a₀ increases nonlinearly, and c₀ decreases nonlinearly with Cl^- contents increasing. The c₀ changes in the relationship of c₀^-2=-a₀^-2+3.2348 with the a₀ as the result of the sliding of PO₄] tetrahedral along 101] orientation.