Ge Xiao, Guo Qingfeng, Wang Qianqian, Li Tao, Liao Libing
School of Gemology, China University of Geosciences, Beijing 100083, China.
Jewelry and Mineral Materials Laboratory of Experimental Teaching Demonstration Center, Beijing 100083, China.
Materials (Basel). 2022 Mar 8;15(6):1983. doi: 10.3390/ma15061983.
Fluorite is rich in mineral resources and its gorgeous colors and excellent luminescence characteristics have attracted the attention of many scholars. In this paper, the composition, structure, luminescent properties, and the potential application value of three fluorites with different colors and are systematically analyzed. The results show that REE and radioactive elements have effects on the structure, color, and luminescence of fluorite. Radioactive elements Th and U will aggravate the formation of crystal defects in fluorite. The green color is related to Ce and Sm. Colloidal calcium and F center are responsible for the blue-purple color of fluorite. There are many luminescent centers, such as Eu, Pr, Dy, Tb, Er, and Sm, in fluorite. The blue fluorescence is mainly caused by 4-45 of Eu. In addition, it is found that fluorite has certain temperature sensing properties in the temperature range of 303-343 K.
萤石矿产资源丰富，其绚丽的色彩和优异的发光特性吸引了众多学者的关注。本文对三种不同颜色萤石的成分、结构、发光性能及潜在应用价值进行了系统分析。结果表明，稀土元素（REE）和放射性元素对萤石的结构、颜色和发光有影响。放射性元素钍（Th）和铀（U）会加剧萤石中晶体缺陷的形成。绿色与铈（Ce）和钐（Sm）有关。胶体钙和F中心是萤石蓝紫色的成因。萤石中有许多发光中心，如铕（Eu）、镨（Pr）、镝（Dy）、铽（Tb）、铒（Er）和钐（Sm）等。蓝色荧光主要由Eu的4-45引起。此外，发现在303-343K温度范围内萤石具有一定的温度传感特性。
