Detection of Heat Treatment in Ruby and Sapphire by Using Infrared Spectroscopy

作     者：Aunaparn Phlayrahan Natthapong Monarumit Somruedee Satitkune Pornsawat Wathanakul 

作者机构：Gem & Mineral Sciences SRUDepartment of Earth SciencesFaculty of ScienceKasetsart University 

出 版 物：《宝石和宝石学杂志》 (Journal of Gems & Gemmology)

年 卷 期：2018年第20卷第S1期

页      面：141-142页

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 1304[艺术学-美术学] 13[艺术学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

主　　题：heat ruby sapphire FTIR 

摘      要：The detection of the heat treatment is one of the infinite problems for testing gem-corundum samples in particular ruby and ***,the alteration of inclusions by heating process can provide the reliable shreds of ***,for strengthening those clues,the infrared spectroscopy was also put into use as a supporting *** is a number of absorptions,i.e.,molecular water(board at 3 000-3 500 cm^(-1)),a set of significant peaks at 3 309,3 232,and 3 185 cm^(-1)(3 309 cm^(-1)-series peak)of structural-OH,and possible hydroxyl minerals such as boehmite/diaspore(1 980-2 200 cm^(-1))in FTIR spectra of ruby and sapphire *** absorptions have been used as an indicator to indicate whether the sample has been undergone *** on our continual researches the appearances of the peaks related mainly to the rearrangements of reactive trace elements in particular Ti^(4+) in the structure of the ***,it is reasonable that those peaks should be assigned to-Ti-OH *** ruby and sapphire samples from different geographic origins were *** samples were prepared by cutting in perpendicular to their c-axis for eliminating the polarization ***,they were polished into a thin slide at the thickness around 2 mm for controlling the optical path *** order to observe the behavior of the 3 309 cm^(-1)-series peak,the heat treatment was performed under the common practice conditions at the temperatures 800,1 000,1 200,1 400,and 1 650℃.In addition,the chemical composition was also *** FTIR spectra of the samples were measured inparallel with the caxis of the *** FTIR spectra of ruby samples show that the 3 309 cm^(-1)-series peak only appeared in the heated samples ≥1 200 ℃ when compare with the same amount of the Ti *** set of peaks is useful to indicate the heat treatment at high *** the case of heating at low temperature,the shift positions of the peaks around