Abstract
A systematic study of the structure and scintillation properties of La elpasolites and related compositions with the formula Cs2ALa1−yCeyX6 (where A=Cs, Na; X=Cl, Br, I) is reported. The compounds were determined to crystallize in a variety of crystal structures. Two of the compounds studied are cubic and their structures match a prediction derived from a composition-related tolerance factor. The cubic structure was not obtained with the iodides. Upon optical and X-ray excitation, the samples show the characteristic Ce3+ emission. Depending on the host, the optimal Ce concentration varied between 0.1 and 15%. The luminosity and energy resolution were measured on 4 single crystals with the following results: Cs2NaLaCl6:4% Ce luminosity of 26,400ph/MeV, energy resolution 4.4%; Cs3LaCl6:8% Ce luminosity of 16,000ph/MeV, energy resolution 8.6%; Cs2NaLaBr6:4% Ce luminosity of 46,000ph/MeV, energy resolution 3.9%; Cs3LaBr6:15% Ce luminosity of 32,500ph/MeV, energy resolution 4.9%. Single crystals of the iodide analogs could not be obtained by the Bridgman technique due to phase separation. Polycrystalline forms of these compounds, obtained by quenching from the melt, are scintillators.
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.
