异极矿热相变过程的高温原位拉曼光谱  

In-situ Test and Study on the Hemimorphite and It's Thermal Phase Transformation by Technology of High Temperature Raman Spectra

作　　者：张健[1] 喻学惠[2] 谢俊[3] 尤静林[4] 莫宣学[2] 

机构地区：[1]天津地质矿产研究所,天津300170 [2]中国地质大学地球科学与资源学院,北京100083 [3]国家珠宝玉石质量监督检验中心,广东深圳518026 [4]上海大学钢铁冶金新技术开发应用重点实验室,上海200072

出　　处：《现代地质》2009年第6期1064-1069,共6页Geoscience

基　　金：国家自然科学重点基金项目(50334040);国家自然科学基金项目(50472104)

摘　　要：利用高温拉曼光谱技术,对异极矿进行了原位拉曼光谱的测试和研究。结果表明,异极矿加热至800 K时,与结晶水(H2O)中O-H伸缩振动对应的3470 cm-1特征拉曼谱峰消失,但标志硅酸盐骨架[Si2O7](Q1)结构的特征谱峰926 cm-1未受影响,表明结晶水的丢失并不影响异极矿的整体结构。当加热至1050 K,反映结构水O-H伸缩振动的特征峰3580 cm-1消失,与Q1结构单元Si-Onb对称伸缩振动相对应的特征峰926 cm-1强度逐渐减小,并出现与Q0相对应的852.4 cm-1特征峰。这表明加热到1050 K时,异极矿开始出现相变。当升温达1100 K以上,结构水(OH)的特征谱峰(3580 cm-1)消失,与Si-Onb对称伸缩振动对应的特征拉曼谱峰变为855 cm-1,这标志着异极矿原有的Q1结构已完全转变为硅锌矿的Q0结构([SiO4]结构),也就是说异极矿已完成向硅锌矿的转变。An in-situ Raman spectra test and study on the hemimorphite were carried out by high temperature Raman spectra technique. The test results show that the characteristic Raman peak of 3,470 cm^-1 representing O - H stretching vibration in the molecular H2O is disappeared as the hemimorphite being heated 800 K, but the characteristic peak 926 cm ^- 1 marked Q1 of the main framework [ Si2O7 ] is been retained, which means the structure of the hemimorphite is not changed as the H2O lost. The characteristic peak of 3,580 cm^-1 related to stretching vibration of the O - H in the structure water （OH） is disappeared as the sample being heated 1,050 K. The relative intensity of the characteristic peak 926 cm^-1 related to symmetric stretching vibration of nonbridging oxygen of structure unit Q1 gradually decreases, comparing with the growing Raman band of Q0 characteristic peak at 852.4 cm^-1, which indicates the phase transformation of the hemimorphite is started out at 1, 050 K. The structure water （OH） is dehydrated completely as the temperature is over 1, 100 K, the character- istic peak （3,580 cm^-1） of the structure water （OH） disappears completely, the characteristic peak related to Si -Onb stretching vibration becomes 855 cm^-1, which shows that primary Qlof the hemimorphite is returned to Qo （i. e. [ SiO4] ）, and which means that the hemimorphite is completely transformed to willemite.

关 键 词：异极矿 原位拉曼光谱 测试 相变 高温 

分 类 号：P575.4[天文地球—矿物学]