Raman spectroscopy of calcium phosphate glasses with varying calcium oxide modifier concentrations
Raman spectroscopy of calcium phosphate glasses with varying calcium oxide modifier concentrations
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不同氧化钙改性剂浓度的磷酸钙玻璃的拉曼光谱
DOI：
10.1021/cm00013a039
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发表时间：
1991
影响因子：
8.6
通讯作者：
S. Risbud
中科院分区：
文献类型：
--
作者：
J. Pemberton;L. Latifzadeh;J. P. Fletcher;S. Risbud
用CaO和磷酸二氢钙制备了一系列钙磷玻璃，其CaO含量从CaO与P205摩尔比为1.00的偏磷酸盐化学计量比到CaO与P205摩尔比为1.49的化学计量比之间变化。对振动行为的研究有助于深入了解CaO改性剂对这些磷酸盐玻璃中发生的解聚过程的影响。曲线拟合程序被用来准确地识别峰位置和分辨光谱中的重叠带。通过I‘JPOP)、I’s(P02)和I‘As(P02)振动的变化，在振动光谱中可以清楚地观察到磷酸链的解聚。在最大CaO改性剂浓度下，观察到了O-和7-Ca2P207的明显晶相。对这些体系的拉曼光谱分析表明，结晶发生在玻璃的短链区域。
Raman spectroscopy has been performed on a series of calcium phosphate glasses prepared from calcium dihydrogenphosphate andCaO in which the CaO content is varied fromthat of the metaphosphate stoichiometry, in which the mole ratio of CaO to P205 is 1.00, to a stoichiometry in which the mole ratio is 1.49. Investigation of the vibrational behavior provides insight into the effects of theCaO modifier on the depolymerization processes occurring in these phosphate glasses. Curve-fitting procedures are used to accurately identify peak positions and resolve overlapped bands in the spectra. Depolymerization of the phosphate chains is clearly observed in the vibrational spectra as indicated by shifts in the i'JPOP), i's (P02), and i'as (P02) vibrations. At the largest CaO modifier concentrations, distinct crystalline phases of o-and 7-Ca2P207 are observed. Analysis of the Ramanspectra for these systems suggests that crys-tallization occurs from the short chain regions of the glass.