Optical Studies of Heavy Metal Fluoride Glasses
- Received Date: 2000-01-28
- Heavy metal fluoride glasses, Fluorescence, Refractive index /
Abstract: The optical characteristics of Heavy Metal Fluoride (HMF) glasses containing Lan-thanum and Cerium have been studied. Optically excited fluorescence measurements on glass sam-ples containing different concentrations (5% and 8%) of cerium show the characteristic excitation and emission spectra of cerium in a fluoride environment with a broad emission peaking at 310nm, when excited at 290nm. All the samples measured had essentially identical spectra apart from a glass containing zirconium substituted for hafnium in which the emission intensity was extremely low. The absorption edge for the HMF glass samples was derived from the optical transmission data. It was noted that the emission spectrum lies close to the band-edge. The absorption depth for these HMF glass samples was measured using the XRD technique. The dispersion behaviour of the HMF glasses in the UV, Vis and NIR was studied and fitted with the sellmeier formula. Re-fractive index measurements show that HMF glasses containing hafnium and either lanthanum or cerium have a low refractive index for their density and low dispersion. It was observed that the HMF glass samples having the same composition have almost the same refractive indices but differ with a slight change in composition. The dispersive power of the glasses was characterized by the Abbe Number. These glasses could be promising candidates for fast, radiation-resistant, scintil-lator elements in electromagnetic Calorimeters used at high energies.
|Citation:||S. F. Shaukat, Dong Yaming. Optical Studies of Heavy Metal Fluoride Glasses[J]. Chinese Journal of Chemical Physics , 2000, 13(5): 571-575. doi: 10.1088/1674-0068/13/5/571-575|