缅甸琥珀的宝石学特征及热处理研究

发布时间：2018-03-16 17:36

  本文选题：缅甸琥珀　切入点：谱学特征　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：作为世界上最古老的宝石之一的缅甸琥珀近年来价格飙升成为研究的热点,本文以缅甸琥珀为研究对象,利用常规宝石学测试方法、偏光显微镜、X射线粉晶衍射仪、红外光谱仪、拉曼光谱仪以及紫外-可见分光光度计等测试方法对其进行了系统的研究,并对其进行热处理实验以进一步比较热处理前后缅甸琥珀的变化。结果表明,缅甸琥珀的比重为1.04~1.06,摩氏硬度为2.03~2.10。在长波紫外灯下多显不均匀的强蓝白色荧光,荧光随纹路分布,可具有异常干涉色;缅甸琥珀红外光谱官能团的吸收峰及分子结构(脂肪族结构)中,羰基C=O伸缩振动引起的吸收峰不同于其他产地的琥珀,波罗的海琥珀吸收峰(1736 cm-1)较高,而缅甸琥珀的吸收峰(1724~1732 cm-1)又高于墨西哥琥珀的峰值(1705 cm-1)。另外,1159 cm-1处的“波罗的海峰”可以作为波罗的海琥珀的辅助鉴定依据。缅甸琥珀在近紫外光区有200~215 nm的π→π*跃迁吸收峰与250 nm的n→π*跃迁吸收峰。通过对比缅甸琥珀热处理前后的特征,实验表明,缅甸琥珀的烤色结果与加热温度、加热时间的长短有关;热处理可改变琥珀紫外荧光颜色,导致其荧光性减弱或淬灭并均匀化;红外光谱中的C-H键因热处理氧化作用而消耗,而C=O官能团及醇、酯及醚等含氧结构增加,且976~1227 cm-1处醇、酯及醚等含氧结构吸收峰由多峰趋于单峰,认为该含氧结构的增加可能导致琥珀变红;热处理后缅甸琥珀的拉曼光谱特征减弱;缅甸琥珀在近紫外区特征的π→π*,n→π*跃迁吸收峰变为一宽带,可作为热处理的佐证。
[Abstract]:As one of the oldest gemstones in the world, the price of Myanmar amber has been a hot spot in recent years. In this paper, the amber of Myanmar is used as the research object, the conventional gemology testing method, the polarizing microscope and X-ray powder diffractometer are used. The infrared spectrometer, Raman spectrometer and UV-Vis spectrophotometer were systematically studied, and the heat treatment experiments were carried out to further compare the changes of amber in Myanmar before and after heat treatment. The specific gravity of amber in Myanmar is 1.04 ~ 1.06, and the Mohl hardness is 2.03 ~ 2.10. Under the long wave ultraviolet lamp, there are many inhomogeneous strong blue-white fluorescence, the fluorescence is distributed along the pattern, and it can have abnormal interference color. In the absorption peak and molecular structure (aliphatic structure) of the functional group of amber in Myanmar, the absorption peak caused by the stretching vibration of carbonyl Con O is different from that of amber from other producing areas, and the absorption peak of amber in the Baltic Sea is higher than that in the Baltic Sea. The absorption peak of amber in Myanmar (1724 ~ 1732 cm-1) is higher than that of amber in Mexico (1705 cm ~ (-1)). In addition, the "Baltic peak" at 1159 cm-1 can be used as an auxiliary basis for identification of amber in the Baltic Sea. There are 200 ~ 215nm 蟺 in the near ultraviolet region of amber in Myanmar. 鈫捪，

本文编号：1620952