Structural interactions of F, Cl and OH in apatites
Structural interactions of F, Cl and OH in apatites
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磷灰石中 F、Cl 和 OH 的结构相互作用
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
R. Young
中科院分区：
文献类型：
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作者：
K. Sudarsanan;R. Young
钙磷灰石Cas（POa）3X（X = F、Cl和OH）的63轴上F、Cl和OH离子的结构相互作用伴随着它们的相互取代，空间群为P63/m。这些相互作用已被研究通过晶体结构的细化为6种矿物和合成试样的不同X-离子含量，加上报告的结果为端员。Cl和OH位置的z位置参数主要对存在的氯的分数敏感并且大致线性地依赖于存在的氯的分数。发现的模式导致预测的z位置参数为0.36至0.37的CI在人类牙齿釉质，氯磷灰石与0.44相比。CI超过F在影响OH离子位置方面的优势与所观察到的CI对OH伸缩频率的更大扰动的红外光谱效应相关。随着相对Cl含量降低，Cl离子移动更靠近相关Ca三角形的平面，其膨胀以保持正常Ca-Cl距离，而与其他X离子相关的Ca三角形保持相对不变。1401
Structural interactions of F, C1, and OH ions accompany their mutual substitutions on the 63 axis of calcium apatites Cas(POa)3X, where X = F, CI and OH, with space group P63/m. These interactions have been studied by means of crystal structural refinements for six mineral and synthetic specimens of differing X-ion contents, plus reported results for the end-members. The z positional parameters of both CI and OH positions are primarily sensitive to and depend roughly linearly on the fractional amount of chlorine present. The pattern found leads to a predicted z positional parameter of 0.36 to 0.37 for the CI in human tooth enamel, contrasting with 0.44 in chlorapatite. The dominance of CI over F in affecting the OH ion positions correlates with the observed infrared spectral effect of greater perturbation of the OH stretch frequency by CI. As the relative CI content decreases, the CI ions move closer to the planes of the associated Ca triangles, which expand to maintain the normal Ca-CI distance while the Ca triangles associated with other X ions remain relatively unchanged. 1401