Ab_xAn_xDi_y硅酸盐熔体结构及其结晶相的高温Raman光谱研究

HIGH TEMPERATURE RAMAN SPECTROSCOPIC STUDY ON MELT STRUCTURE AND CRYSTAL PHASE OF Ab_xAn_xDi_y SILICATE MELTS

运用高温Raman光谱测试技术 ,对共结线附近一系列的AbxAnxDiy 样品进行了升温过程的研究。系统地对比分析了这一系列样品的玻璃 -晶体 -熔体的Raman光谱特征。低温玻璃与高温熔体在结构上虽然很相似 ,但确实存在差别。晶体与玻璃和熔体的特征峰有相似性 ,反映了晶体结构对熔体结构的继承性。晶体Raman峰的强度变化规律与温度和成分关系 ,反映了相图中不同首晶区的结晶过程特点和晶体含量的变化关系。同时 。

A series of quenched Ab_xAn_xDi_y silicate glass samples near cotectic_line were studied by high_temperature Raman spectroscopy from room temperature up to 1 673 K. The features of the Raman spectra of the four samples were compared systematically. Although the structures of the glass and melt are very similar, there exist some differences which can not be ignored. The similarities of the characteristic Raman peaks between the crystal, the glass and melts reflect the heredity of the structure of the crystal from the melt structure. The variation of the Raman spectroscopic intensity of crystal is dependent on temperature and components, which reveals the variation of the contents of two minerals with different relative densities and the features during the crystallizing process. Temperature dependence relative contents of the different structure units were studied by deconvolution of the high_frequencies spectrum region.