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

宝石和宝石学杂志 2018年第S1期20卷 141-142页

作者： Aunaparn Phlayrahan Natthapong Monarumit somruedee satitkune Pornsawat Wathanakul Gem & Mineral Sciences SRU Department of Earth SciencesFaculty of ScienceKasetsart University

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

关键词： heat ruby sapphire FTIR

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