文献类型：期刊文献

中文题名：紫色翡翠致色机理探讨

英文题名：Coloring Mechanism of Purple Jadeite

作者：何伟[1];王以群[1];毛荐[1]

机构：[1]华东理工大学宝石检测中心,上海200237

年份：2011

卷号：37

期号：2

起止页码：182

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：紫色翡翠;致色机理;紫外-可见光吸收光谱;热处理

外文关键词：purple jadeite; coloration mechanism; ultraviolet-visble absorption spectrum; heat treatment

摘要：通过X射线衍射、X荧光光谱等测试手段对紫色翡翠的致色机理进行讨论,紫色翡翠中Fe含量较高,Mn含量极低。在氧化气氛下,将紫色翡翠加热到650℃,其颜色变淡,认为是Fe2+被氧化成Fe3+所致。紫色翡翠热处理前后的紫外可见光谱图中缺乏Mn3+在540 nm的吸收峰,故Mn离子并非致色的主要原因。在还原气氛下,热处理可使紫色翡翠颜色加深变暗,这是因为Fe2+含量增加,使得Fe2+→Fe3+电荷转移跃迁的强度增大,导致其吸收带覆盖了整个可见光区。Fe2+与Fe3+之间的电子跃迁应为致色的主要原因。
In this paper,the coloring mechanism of purple jadeite was investigated by X-ray diffraction,X-ray fluorescent spectrum and other methods.The content of Fe was high in the purple jadeite,while that of Mn was rather low.At the oxidation atmosphere,the color of purple jadeite was thinned out at 650 ℃,which attributed to the oxidation of Fe^（2＋） to Fe^（3＋）.There was no absorption peak at 540 nm（the characteristic peak of Mn^（3＋）） in the ultraviolet-visible absorption spectrum before and after heat treatment of the purple jadeite,which means that the manganese ion wasn＇t the main factor for coloring.At the reducing atmosphere,the color of the purple jadeite was deepened and darkened via heat treatment due to the increase of the Fe^（2＋）content,the enhanced transition from Fe^（2＋） to Fe^（3＋）,and thus absorption band covering all visible light area.The transition between Fe^（2＋） and Fe^（3＋） was the main reason for coloring of purple jadeite.