文献类型：期刊文献

中文题名：Study on low-temperature heat treatment of purplish red sapphire

英文题名：Study on low-temperature heat treatment of purplish red sapphire

作者：Han, Xiaozhen[1,2];Kang, Yan[3];Wu, Xiao[2];Liu, Xueliang[1];Guo, Shouguo[1]

机构：[1]E China Univ Sci & Technol, Gemstone Testing Ctr, Shanghai 200237, Peoples R China;[2]Shanghai Jian Qiao Univ, Jewelry Coll, Shanghai 201306, Peoples R China;[3]E China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2016

卷号：14

期号：5

中文期刊名：Chinese Optics Letters

外文期刊名：CHINESE OPTICS LETTERS

收录：CSTPCD;;EI(收录号：20162102427202);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000375921000021)】；CSCD:【CSCD2015_2016】；PubMed;

语种：英文

中文关键词：Charge transfer;Electromagnetic wave absorption;Heat treatment;Low temperature operations;Sapphire;Temperature;Ultraviolet spectroscopy

外文关键词：Sapphire - Charge transfer - Heat treatment - Electron transitions - Temperature - Ultraviolet spectroscopy

摘要：A light purplish red sapphire is heat treated in an airtight crucible. The sample changes little in color after receiving heat treatment at 1100℃, but turns to light blue and blue after being treated at 1200℃ and 1300℃, respectively. Before heating, the UV-VIS absorption spectra of the sample are dominated by the 551 nm broad absorption band contributed by the d-electron transition 4A2 →4 4T2 of Cr3＋. After heating, the UV-VIS absorption spectra are dominated by the 563 nm broad absorption band contributed by the inter- valence charge transfer of Fe2＋ - Ti4＋. The x ray photoelectron spectroscopy test reveals that the Fe2＋ and Ti4＋ ion contents increase with increasing temperature. The sapphire changing from light purplish red to blue in the heating process is owing to the fact that the Fe2＋ and Ti4＋ contents grow and the intervalence charge transfer of Fe2＋ - Ti4＋ selectively absorbs UV-VIS light.
A light purplish red sapphire is heat treated in an airtight crucible. The sample changes little in color after receiving heat treatment at 1100 degrees C, but turns to light blue and blue after being treated at 1200 degrees C and 1300 degrees C, respectively. Before heating, the UV-VIS absorption spectra of the sample are dominated by the 551 nm broad absorption band contributed by the d-electron transition (4)A(2) -> T-4(2) of Cr3+. After heating, the UV-VIS absorption spectra are dominated by the 563 nm broad absorption band contributed by the intervalence charge transfer of Fe2+-Ti4+. The x ray photoelectron spectroscopy test reveals that the Fe2+ and Ti4+ ion contents increase with increasing temperature. The sapphire changing from light purplish red to blue in the heating process is owing to the fact that the Fe2+ and Ti4+ contents grow and the intervalence charge transfer of Fe2+ - Ti4+ selectively absorbs UV-VIS light.