Understanding phase equilibria and segregation in Bridgman growth of Cs 2 LiYCl 6 scintillator

Cs 2 LiYCl 6 (CLYC) is a commercial scintillator material having good energy resolution and dual gamma/neutron detection capabilities. CLYC crystals currently used in detectors are grown by the vertical Bridgman method. Boules grown from stoichiometric melts, however, often contain secondary phases,...

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Bibliographic Details
Published in:Journal of materials research 2017-06, Vol.32 (12), p.2373-2380
Main Authors: Ruta, Francesco L., Swider, Stacy, Lam, Stephanie, Feigelson, Robert S.
Format: Article
Language:English
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Summary:Cs 2 LiYCl 6 (CLYC) is a commercial scintillator material having good energy resolution and dual gamma/neutron detection capabilities. CLYC crystals currently used in detectors are grown by the vertical Bridgman method. Boules grown from stoichiometric melts, however, often contain secondary phases, Cs 3 YCl 6 and LiCl, at the beginning and end of the crystal, respectively, suggesting that this composition is incongruently melting. Since no phase diagram containing CLYC existed in the literature prior to this study, the Cs 2 YCl 5 –LiCl phase diagram was explored. Several crystals were then grown from various melt compositions. As predicted from the phase diagram, a starting composition of around 60 mol% LiCl did not produce Cs 3 YCl 6 and maintained a low concentration of LiCl.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2017.168