磷灰石结构通道离子对晶胞参数的影响

THE EFFECTS OF STRUCTURAL CHANNEL INOS OF APATITE ON THEIR LATTICE PARAMETERS

磷灰石晶胞参数受其结构中 Ca多面体、磷氧四面体及结构通道位置上的类质同象替换的影响。本文讨论了 5 4个磷灰石样品的晶胞参数与结构通道离子 F,OH,Cl相对含量的关系 ,发现 Cl的取代是影响岩浆型磷灰石晶胞参数的主要因素 ,每原子 /晶胞的Cl使 a增大 0 .12 11(6 ) nm,而 c减少 0 .0 6 33(3) nm。根据成分与结构的经验关系式 ,可以验证电子探针对 F的分析结果。

The lattice parameter of apatite minerals are affected by the isomorphic substitutions in their Ca polyhedra, PO 4 tetrahedra and structural channel. In this paper, the correlation between the lattice parameters and F-,OH-,Cl- content of apatite was investigated. It has been found that the Cl substitution is the major factor controlling the lattice parameters for magmatic apatites. The entering of Cl increases the a (0.012 1 nm for atom cell) and reduces the c ( 0.006 3 nm for atom cell). The correlation can be applied to modify the EMPA analytical F content of apatite.