Huang Zhi-Liang, Wang Da-Wei, Liu Yu, Zhang Yu, Xu Huan-yan
Department of Material Engineering, Wuhan Institute of Chemical Technology, Wuhan 430073, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Dec;22(6):949-53.
The CO(2-)3-substituted apatite solid solutions were prepared through different methods. The FTIR and XRD measurements were applied to investigate its crystal chemistry properties. The results indicated that the CO(2-)3-substituted sites in the carbonate hydroxyapatite(CHAP) prepared through homogeneous precipitation method are type-B in which [CO3.OH] tetrahedral-coordinations are substituted for [PO4] tetrahedral-coordinations; the ones in the CHAP prepared through solid phase ions exchange method are type-A in which [CO3] triangle-coordinations are substituted for [OH] in column sites; the ones in the carbonate fluorapatite(CFAP) prepared through solid phase reaction method are type-B in which [CO3.F] tetrahedral-coordinations are substituted for [PO4] tetrahedral-coordinations; the ones in the CHAP prepared through sol-gel method are AB mixed-type. The vibrational band psi 3 is splitted into psi 3-1, psi 3-4 and psi 3F. The psi 3F is combined by psi 3-2 (type-A) and psi 3-3 (type-B) in Gaussian function fitting. When Wco(2-)3 < 3.34%, substitution value of type-A increases with the increasing of CO(2-)3 contents. When Wco(2-)3 = 3.34%, substitution value of type-A has maximum. When 3.34% < Wco(2-)3 < 7.52%, substitution value of type-B increases with the increasing of CO(2-)3 contents. When Wco(2-)3 = 7.52%, substitution value of type-B has maximum.
通过不同方法制备了碳酸根取代的磷灰石固溶体。采用傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）测量来研究其晶体化学性质。结果表明，通过均匀沉淀法制备的碳酸羟基磷灰石（CHAP）中的碳酸根取代位点为B型，即[CO₃·OH]四面体配位取代[PO₄]四面体配位；通过固相离子交换法制备的CHAP中的碳酸根取代位点为A型，即[CO₃]三角形配位取代柱状位点中的[OH]；通过固相反应法制备的碳酸氟磷灰石（CFAP）中的碳酸根取代位点为B型，即[CO₃·F]四面体配位取代[PO₄]四面体配位；通过溶胶 - 凝胶法制备的CHAP中的碳酸根取代位点为AB混合型。振动带ψ₃分裂为ψ₃ - 1、ψ₃ - 4和ψ₃F。在高斯函数拟合中，ψ₃F由ψ₃ - 2（A型）和ψ₃ - 3（B型）组合而成。当Wco₂⁻₃ < 3.34%时，A型取代值随CO₂⁻₃含量的增加而增加。当Wco₂⁻₃ = 3.34%时，A型取代值最大。当3.34% < Wco₂⁻₃ < 7.52%时，B型取代值随CO₂⁻₃含量的增加而增加。当Wco₂⁻₃ = 7.52%时，B型取代值最大。
