论文部分内容阅读
对Ｆｏｒｔ Ｐｏｒｔａｌ（乌干达）碳酸岩中氟羟磷灰石进行了ＥＭＰＡ，ＸＲＤ，ＩＲ谱和单晶Ｘ射线结构精化研究；结果表明：ＣＯ（２－）３是其中Ａ１７ａ样品的最重要替换组分而其Ｐ＋Ｓｉ＋Ｓ＋Ｃ原子之和超过四面体位置数，达到６．１４，与其高ＣＯ（２－）３含量相对比，它有很大的晶胞参数ａ值与很小的ｃ／ａ。值，相对其低一中ＯＨ－与Ｃｌ－含量，它的结构通道直径很大（Ｃａ２－Ｃａ２间距达０．４０５４ｎｍ）。上述异常的晶体化学特征暗示：在该磷灰石中，ＣＯ（２－）３除替换ＰＯ（３－）４外，还可能进入结构通道而产生Ａ－Ｂ混合型替换。天然羟磷灰石中可能存在下列类质同像替换机理：。
EMPA, XRD, IR spectra and single crystal X-ray structure refinement of Fluorocarbon hydroxyapatite in Fort Portal carbonate rock were studied. The results showed that CO (2-) 3 was the most important substitution group of A17a sample The sum of P + Si + S + C atoms exceeds the number of tetrahedral sites to 6.14, which is in contrast to its high CO (2-) 3 content, which has a large unit cell a value and a small c / a. Compared with the OH- and Cl- content in the lower one, its structure channel diameter is very large (Ca2-Ca2 spacing is 0.4054nm). The above anomalous crystallographic characterization suggests that in this apatite, CO (2-) 3 may also enter the structural channel in addition to PO (3-) 4 to create an A-B mixed substitution. The following types of isomorphic substitution mechanisms may exist in native hydroxyapatite:.