| 偏磷酸钙玻璃制备过程结构变化的拉曼光谱分析 |
| Raman Spectra Analysis for Calcium Metaphosphate Structure Transformation in Glass Preparation Process |
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| 摘要: 为了探究偏磷酸钙玻璃制备过程的结构变化，采集了Ca(H2PO4)2·H2O经300~1 050 ℃热处理后样品的拉曼光谱。对拉曼谱带的振动模式进行了指认，并利用拉曼谱峰波数计算了主链上的P-O键长。结果表明，随热处理温度升高，Ca(H2PO4)2·H2O依次发生失去结晶水、失去结构水、生成焦磷酸钙、生成偏磷酸钙、偏磷酸钙同质异构转变、融化等物理化学变化。高温处理的样品易观察到磷酸盐骨架的变角转动光谱。整个过程中，主链上P-O键键长增大，焦磷酸钙的P-O键长为0.162 2 nm，偏磷酸钙玻璃的P-O键长为0.164 3 nm。β-Ca2P2O7向γ-Ca(PO3)2和β-Ca(PO3)2相变过程中，侧链上P-O键键长减小。Ca(PO3)2同质异构相变过程中，侧链上P-O键长几乎不变。 |
| 关键词: 偏磷酸钙 玻璃结构 Raman光谱 |
| 基金项目: |
| Abstract: In order to study the structure transformation for the preparation process of calcium metaphosphate glass, the Raman spectra of Ca(H2PO4)2·H2O samples heated from 300 to 1 050 ℃ were collected. The vibration mode was assigned and the length of P-O bonds was calculated by using Raman wavenumber. The results show that the physical chemistry transformation of the Ca(H2PO4)2·H2O occurs as crystal-water and structural water loss, calcium acid pyrophosphate and calcium metaphosphate formation, isomeric change and melting with the increase in temperature. The bend deformation vibrations of P-O could be observed sensitively for the sample heated at high temperature. The P-O bond length in framework increases during the whole polymeric process. The P-O bond length is 0.162 2 nm in the framework for Calcium acid pyrophosphate and 0.164 3 nm for Calcium metaphosphate glass. The P-O bond length decreases in terminal P-O bond during the transformation process from β-Ca2P2O7to γ-Ca(PO3)2 and β-Ca(PO3)2, but keeps unchanged during the Ca(PO3)2 isomeric transformation process. |
| Keywords: calcium metaphosphate glass structure Raman spectrum |
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| 摘要点击次数: 1994 |
| 全文下载次数: 2198 |
| 梁晓峰,杨世源,尹光福.偏磷酸钙玻璃制备过程结构变化的拉曼光谱分析[J].无机化学学报,2010,26(8):1404-1408. |
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