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首页> 外文期刊>Russian Journal of Physical Chemistry >Some Structural Properties of the Mixed Lead-Magnesium Hydroxyapatites
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Some Structural Properties of the Mixed Lead-Magnesium Hydroxyapatites

机译：混合铅镁羟基磷灰石的一些结构性质

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摘要

Lead-magnesium hydroxyapatite solid solutions Pb(10-x)Mg (x) (PO4)(6)(OH)(2) have been prepared via a hydrothermal process. They were characterized by X-ray powder diffraction, Transmission Electron Microscopy (TEM), chemical and IR spectroscopic analyses. The results of the structural refinement indicated that the limits of lead-magnesium solid solutions (x aecurrency 1.5), a regular decrease of the lattice constant a and a preferential magnesium distribution in site S(I). Through the progressive replacement of Pb2+ (r = 0.133 nm) by the smaller cation Mg2+ (r = 0.072 nm), all interatomic distances decrease in accordance with the decrease of the cell parameters. According to what could be expected from the coordinance of the metallic sites S(I) (hexacoordination) and S(II) (heptacoordination), the small magnesium cation preferentially occupies the four sites S(I). The results of the TEM analysis confirm the presence of magnesium in the starting solution and reveals the decrease in the average size of crystals. The IR spectra show the presence of the absorption bands characteristic for the apatite structure.
机译：通过水热法制料制备铅镁羟基磷灰石固溶体PB（10-X）Mg（X）（X）（6）（OH）（2）。它们的特征在于X射线粉末衍射，透射电子显微镜（TEM），化学和IR光谱分析。结构细化的结果表明，铅镁固溶体的限制（X AE＆ Currency＆ 1.5），定期降低晶格常数A和位点（I）中的优先镁分布。通过较小的阳离子Mg2 +（r = 0.072nm）的Pb2 +（r = 0.133nm）进行Pb2 +（r = 0.133nm），所有内部距离根据细胞参数的降低而降低。根据金属位点的协调（六种六开素）和S（II）（庚烷开标）的预期的预期，小镁阳离子优先占四个地点S（i）。 TEM分析的结果证实了起始溶液中镁的存在，并揭示了晶体平均尺寸的降低。 IR光谱显示出磷灰石结构的吸收带的存在。

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