Abstract
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 Ce3+ and Sm2+. 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 4f7-4f65d1 of Eu2+. In addition, it is found that fluorite has certain temperature sensing properties in the temperature range of 303–343 K.
Highlights
Fluorite, known as fluorspar, is named for its fluorescence under ultraviolet and cathode-ray irradiation
REE3+, U4+, Th4+, and other elements widely exist in fluorite
Fluorite is irradiated by radioactive elements to form colloidal calcium
Summary
Known as fluorspar, is named for its fluorescence under ultraviolet and cathode-ray irradiation. Rare-earth elements (REEs), transition metal elements (Cr, Mn, Fe, Zn), and alkaline elements (Na, K) can often occupy Ca sites in the crystal structure of fluorite. There are three main viewpoints, that is, the coloration of impurity elements [1–5], crystal defects [6–9], and organic matter [10,11]. REE3+, U4+, Th4+, and other elements widely exist in fluorite. From the perspective of crystal chemistry, the sites of Ca (1.06 Å) in the fluorite structure can be occupied by REE in the form of isomorphism. Fluorite and surrounding rocks often contain radioactive elements such as U and Th. Fluorite is irradiated by radioactive elements to form colloidal calcium. When colloidal calcium stays in lattice defects, fluorite produces a typical characteristic absorption band in the range of 560–580 nm. Organic matter sometimes exists in fluorite in the form of inclusions. Thtiiosnmoafnfuluscorripittei.s helpful to understand the optical properties of fluorite and broaden the application of fluorite
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
