山东蓝宝石铁离子的价态及其对色调的影响  

VALENCE STATE OF IRON ION IN THE SHANDONG SAPPHIRE AND ITS EFFECT ON COL0R

作　　者：曹荣龙[1] 曹姝 

机构地区：[1]中国科学院广州地球化学研究所 [2]广东省技术监督珠宝玉石质量监督检验站

出　　处：《矿产与地质》1997年第6期413-422,共10页Mineral Resources and Geology

摘　　要：山东蓝色蓝宝石的着色是由Ｔｉ４＋离子与Ｆｅ２＋离子合理配比而成，一般控制在Ｔｉ４＋／Ｆｅ２＋＝１的配比范围内。多余的Ｆｅ２＋和其它Ｆｅ３＋离子存在都不利于蓝色蓝宝石正常呈色。通过穆斯堡尔谱和电子顺磁共振谱分析，测定了山东蓝宝石中铁离子的不同价态和浓度。对Ｆｅ２＋和Ｆｅ３＋离子所引起的吸收光谱特征作了研究，查明只有Ｆｅ３＋浓度很高时才产生４７７ｎｍ吸收峰，是致使山东蓝宝石表观上呈深蓝带黑色调的的重要原因。The blue sapphire from Shandong is coloring due to reasonable ionic proportion by Ti 4+ and Fe 2+ , generally the Ti 4+ /Fe 2+ =1. The excess Fe 2+ and existence of other Fe +3 would be harmful to the normal blue coloration. The valence state and ionic concentration of iron in the Shandong sapphire were determined by Mssbauer spectrometric and electron paramagnetic resonance analyses. The characteristics of absorption spectrum arised from Fe 2+ and Fe 3+ have been investigated. It is indicated that the absorption peak at 477 nm can be produced only the Fe 3+ is highly concentrated, which would be an essential reason to cause the Shangong sapphire being colored as dark blue with black.

关 键 词：蓝宝石 铁离子价态 着色机理 穆斯尔谱 

分 类 号：TS933.3[轻工技术与工程] P618.281[天文地球—矿床学]