Spectroscopy and chromaticity characterization of yellow to light-blue iron-containing beryl.

ABSTRACT: The chemical composition and influencing factors of the colour of 95 yellow to light blue iron-bearing beryl are studied through Electron Microprobe Analysis (EMPA), Energy-dispersive X-ray fluorescence (ED-XRF) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and X-Rite SP62 spectrophotometer. The intensities of the three characteristic hydroxyl stretching bands of the beryl from 3500 cm^-1 to 3800 cm^-1 prove they are low to medium levels of alkali bearing natural beryl. The wide absorption edge of 320 ~ 465 nm caused by the ultra-violet charge transfer from O^2- to Fe³⁺ and the 650 nm absorption band in E//c-polarization caused by the intervalence charge transfer between Fe²⁺ and F

SUBMITTER: Shang Y 

PROVIDER: S-EPMC9232576 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature