无机化学学报

不同类型的CO₃^2-替换羟基磷灰石固溶体晶体化学FT-IR研究

FT-IR Investigation on Crystal Chemistry of Various CO₃^2--Substituted Hydroxyapatite Solid Solutions

作者	单位
黄志良	武汉化工学院材料系,武汉 430073 中南大学资源与环境学院,长沙 410083
王大伟	中南大学资源与环境学院,长沙 410083
刘羽	武汉化工学院材料系,武汉 430073
张昱	武汉化工学院材料系,武汉 430073
胥焕岩	武汉化工学院材料系,武汉 430073

摘要: 利用FT-IR结合XRD对不同类型的CO₃^2-替换磷灰石固溶体进行了晶体化学研究,结果表明:B型替换碳羟磷灰石(CHAP)的替换方式是[CO₃·OH]四面体替换[PO₄]四面体;A型替换CHAP的替换方式是[CO₃]三角形配位体替换通道位置的OH^-;AB混合型替换CHAP的FT-IR谱中非对称伸缩振动ν₃分裂为ν_3-1、ν_3F、ν_3-4,高斯函数法拟合表明ν_3F峰是A型替换的ν_3-2与B型替换的ν_3-3的叠合。当W_CO₃^2-≦3.34%时,随CO₃^2-含量增加,A型替换量增大,替换指数(SI)增大,且当W_CO₃^2-=3.34%时,SI达最大值,当3.34%CO₃^2-≦7.52%时,随CO₃^2-含量增加,SI减小,B型替换量增大,且当W_CO₃^2-=7.52%时总固溶量饱和。

关键词: 碳羟磷灰石(CHAP) CO₃^2-离子替换固溶体晶体化学 FT-IR

基金项目:

Abstract: FT-IR and XRD measurements were applied to investigate crystal chemistry properties of the various CO₃^2--Substituted hydroxyapatite solid solutions. The results indicated that [CO₃·OH] tetrahedral-coordination is sub-stituted for [PO₄] tetrahedral-coordination in the type-B carbonate hydroxyapatite(CHAP); In the type-A CHAP, [CO₃] triangle-coordination is substituted for [OH] in channel site; In the AB mixed-type CHAP ,The ν₃ (non-symmetry flexible vibration band) is split into ν_3-1、ν_3F and ν_3-4. The ν_3F is combined by ν_3-2(type-A) and ν_3-3(type-B) in Gauss function fitting. When W_CO₃^2-≦3.34%, substitution value of type-A and substitution index(SI) increase with the increasing of CO₃^2- content. When W_CO₃^2-=3.34%, substitution value of type-A has the maximum. When 3.34%CO₃^2-≦7.52%, substitution value of type-B increases with the increasing of CO₃^2- content,but SI decreases. When W_CO₃^2-=7.52%, total substitution value of CO₃^2- in the AB mixed-type CHAP is saturated.

Keywords: hydroxyapatite (CHAP) CO₃^2--substituted solid solution crystal chemistry FT-IR

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黄志良,王大伟,刘羽,张昱,胥焕岩.不同类型的CO₃^2-替换羟基磷灰石固溶体晶体化学FT-IR研究[J].无机化学学报,2002,18(5):469-474.

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