摘要
通过傅立叶变化红外光谱(FT-IR)、X射线衍射(XRD)和差热(DSC)等技术分析了蜘蛛螺贝壳粉末的成分和热行为。XRD和DSC结果表明蜘蛛螺贝壳是由文石型碳酸钙构成,在300℃文石转变为方解石。红外光谱表明在海螺壳的有机质中存在NH,OH和amide等官能团,在文石晶格或有机与晶体的界面处存在HCO3-原子团。加热后的FT-IR特征峰的峰型和峰位表现出明显的变化,这些变化说明在250℃加热1 h后贝壳的有机质部分发生分解;在500℃～600℃时海螺壳中的有机质仍然没有完全分解,揭示出贝壳具有良好的热稳定性。
The mineral and organic matrix compositions and the thermal behavior of the common spider conch shell were studied with Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD） and differential scanning calorimetry（DSC）. The results of XRD and DSC indicate that the common spider conch shell is composed of calcium carbonate highly crystallized as aragonite and the heated aragonite mineral structure underwent transformation from aragonite to calcite at 300℃. The FT-IR spectra showed NH,OH and amide groups occur in the shell of common spider conch, with the HCO3^- groups possibly at the organic-mineral interface. The significant variations of peak position and band width of FT-IR spectra after heated reveal that the organic matrix of the shell of common spider conch was partly decomposed at 250 ℃ and still not completely destroyed around 550℃ -600 ℃, revealing the great thermal stability of the organic-matrix bonding.
出处
《矿物岩石》
CAS
CSCD
北大核心
2007年第2期12-16,共5页
Mineralogy and Petrology
