本文選題：緬甸琥珀　切入點：譜學特征　出處：《中國地質大學(北京)》2015年碩士論文　論文類型：學位論文

【摘要】：作為世界上最古老的寶石之一的緬甸琥珀近年來價格飆升成為研究的熱點,本文以緬甸琥珀為研究對象,利用常規(guī)寶石學測試方法、偏光顯微鏡、X射線粉晶衍射儀、紅外光譜儀、拉曼光譜儀以及紫外-可見分光光度計等測試方法對其進行了系統(tǒng)的研究,并對其進行熱處理實驗以進一步比較熱處理前后緬甸琥珀的變化。結果表明,緬甸琥珀的比重為1.04~1.06,摩氏硬度為2.03~2.10。在長波紫外燈下多顯不均勻的強藍白色熒光,熒光隨紋路分布,可具有異常干涉色;緬甸琥珀紅外光譜官能團的吸收峰及分子結構(脂肪族結構)中,羰基C=O伸縮振動引起的吸收峰不同于其他產地的琥珀,波羅的海琥珀吸收峰(1736 cm-1)較高,而緬甸琥珀的吸收峰(1724~1732 cm-1)又高于墨西哥琥珀的峰值(1705 cm-1)。另外,1159 cm-1處的“波羅的海峰”可以作為波羅的海琥珀的輔助鑒定依據。緬甸琥珀在近紫外光區(qū)有200~215 nm的π→π*躍遷吸收峰與250 nm的n→π*躍遷吸收峰。通過對比緬甸琥珀熱處理前后的特征,實驗表明,緬甸琥珀的烤色結果與加熱溫度、加熱時間的長短有關;熱處理可改變琥珀紫外熒光顏色,導致其熒光性減弱或淬滅并均勻化;紅外光譜中的C-H鍵因熱處理氧化作用而消耗,而C=O官能團及醇、酯及醚等含氧結構增加,且976~1227 cm-1處醇、酯及醚等含氧結構吸收峰由多峰趨于單峰,認為該含氧結構的增加可能導致琥珀變紅;熱處理后緬甸琥珀的拉曼光譜特征減弱;緬甸琥珀在近紫外區(qū)特征的π→π*,n→π*躍遷吸收峰變?yōu)橐粚拵?可作為熱處理的佐證。
[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，

本文編號：1620952