Record details

Title
    Defects in CaF2 caused by long-time irradiation and their response to annealing
Author
    Čížek, Jakub
    Drahokoupil, Jan
    Miyajima, Nobuyoshi
    Skála, Roman
    Valenta, Jan
    Vlček, Vojtěch
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Philosophical Magazine
Vol./nr.
    Roč. 90, č. 20
Pages
    21
Year
    2010
Thesaurus term
    annealing
    CaF2
    Defects
    long-time irradiation
Keyword
    Annealing
    CaF2
    Caused
    Defects
    Irradiation
    Long-time
    Response
Abstract (in english)
   Samples of CaF2 irradiated for millions of years in nature were studied by several methods, including X-Ray diffraction, positron annihilation spectroscopy (PAS), photoluminescence spectroscopy (PLS) and transmission electron microscopy (TEM). It was found that the unexpectedly high density of radiation-induced defects present in the fluorite structure (documented by TEM) causes significant micro-strains. Even annealing up to 450 °C cannot completely remove these micro-strains, which are stabilised by impurities. PAS and subsequent theoretical calculations revealed the behaviour of the defects during heating. The PL spectra of irradiated fluorite were also interpreted.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    8. 8. 2012