文献类型：期刊文献

英文题名：Intervalence charge transfer transition of Co2+-Ti4+ ion pair in α-Al2O3:Co,Ti crystal

作者：Han, Xiaozhen[1,2];Feng, Xiqi[3];Kang, Yan[4];Guo, Shouguo[1];Li, Yongsheng[5]

机构：[1]East China Univ Sci & Technol, Gemstone Testing Ctr, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Jian Qiao Univ, Jewelry Coll, 1111 Huchenghuan Rd, Shanghai 201306, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent & Optofunct Inorgan Mat, 1295 Dingxi Rd, Shanghai 200050, Peoples R China;[4]East China Univ Sci & Technol, Res Ctr Anal & Test, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Minist Educ, Sch Mat Sci & Engn, Lab Low Dimens Mat Chem,Key Lab Ultrafine Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：768

起止页码：1058

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20183205653658);WOS:【SCI-EXPANDED(收录号:WOS:000446320700123)】；

语种：英文

外文关键词：Corundum; Heteronuclear ion pair; Intervalence charge transfer; Optical absorption spectra

摘要：A new optical absorption band centered at 356 nm was observed in Co/Ti co-doped synthetic corundum in ultraviolet (UV) region while it doesn't exist in corundum single doped with cobalt or titanium. It is featured with high optical absorption intensity, full width at half maxima (FWHM, greater than 3000 cm(-1)), strong polarization along the metal ion-metal ion direction, which is consistent with the optical characteristics of intervalence charge transfer transition (IVCT). We propose that the 356 nm absorption band is generated by IVCT of Co2+-Ti4+ heteronuclear ion pair whose formation mechanism would be discussed briefly in this paper. Co2+-Ti4+ was found for the first time in corundum and is the second heteronuclear ion pair discovered in corundum in addition to the known Fe2+-Ti4+. (C) 2018 Elsevier B.V. All rights reserved.