Title :
Photochromism in Calcium and Strontium Fluoride Crystals Doped With Rare-Earths Ions
Author :
Sizova, T. ; Radzhabov, E.
Author_Institution :
Dept. of Phys. of Monocrystals, Vinigradov´´ Inst. of Geochem., Irkutsk, Russia
Abstract :
This paper reports the absorption spectra of photochromic centers in CaF2 and SrF2 crystals doped with Ce3+ and Gd3+ impurities and thermal decay of the centers in temperature range 80-500 K. The ionized photochromic color centers are generated in crystals under low-temperature X-rays irradiation. These centers are transformed into photochromic color centers upon heating of crystals. All color centers decay at temperature about 500 K.
Keywords :
X-ray effects; calcium compounds; cerium; colour centres; gadolinium; heat treatment; impurities; photochromism; strontium compounds; ultraviolet spectra; visible spectra; CaF crystal; CaF2:Ce; CaF2:Gd; SrF crystal; SrF2:Ce; SrF2:Gd; ionized photochromic color centers; low-temperature X-rays irradiation; photochromic center absorption spectra; rare-earths ions; temperature 80 K to 500 K; thermal decay; Absorption; Crystals; Heating; Image color analysis; Ions; Particle beam optics; Solids; Alkaline-earth fluorides; X-rays; optical spectroscopy; radiation hardness; rare earths; scintillators;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2012.2190423
