蛇纹石猫眼的红外光谱及热相变机制研究  

Infrared Absorption Spectra of Serpentine Cat's Eye and the Mechanism of It's Thermotransformation

作　　者：卢保奇[1] 夏义本[1] 亓利剑[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]中国地质大学珠宝学院,武汉430074

出　　处：《无机材料学报》2005年第2期285-290,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(49772096)上海市教育委员会发展基金(03AK23)

摘　　要：以四川蛇纹石猫眼为研究对象,采用差热分析(DTA)、红外吸收光谱(IR)和X射 线粉晶衍射(XRD)方法,在变温条件下对蛇纹石猫眼及其热相变的产物和机制进行了研究. 结果表明:加热到700℃时,蛇纹石猫眼完全脱羟,同时部分转变为晶质镁橄榄石和非晶质顽 火辉石.800℃时,晶质顽火辉石生成.800-1100℃时,晶质镁橄榄石和晶质顽火辉石的量 逐渐增加. 1100℃时顽火辉石的结晶有序度增加.加热过程中未出现SiO2相.并提出了纤 蛇纹石猫眼的热相变机制.DTA, IR and XRD were used to study the characteristics of serpentine cat's eye from Sichuan province at different temperatures. Also, the thermotransformation products and mechanism of Sichuan serpentine cat's eye were discussed. Finally, the mechanism of thermotransformation of chrysotile cat's eye was proposed. The results show that when heated up to 700 degrees C, the serpentine cat's eye completely dehydrates and partly transforms into crystalline forsterite and non-crystalline enstatite. At 800 degrees C, crystalline enstatite is formed. Heated above 800 to 1100 degrees C, the amount of crystalline forsterite and enstatite increases gradually: Up to 1100 degrees C, the degree of crystalline order of enstatite is improved. During thermotransformation, no SiO2 phase is formed.

关 键 词：蛇纹石猫眼 镁橄榄石 顽火辉石 热相变 

分 类 号：P619[天文地球—矿床学]