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Understanding phase equilibria and segregation in Bridgman growth of Cs2LiYCl6 scintillator

Published online by Cambridge University Press:  22 May 2017

Francesco L. Ruta Open the ORCID record for Francesco L. Ruta [Opens in a new window] ,
Stacy Swider ,
Stephanie Lam  and
Robert S. Feigelson
Francesco L. Ruta*
Affiliation:
Materials Science & Engineering, Stanford University, Stanford, California 94305
Stacy Swider
Affiliation:
CapeSym, Inc., Natick, Massachusetts 01760
Stephanie Lam
Affiliation:
CapeSym, Inc., Natick, Massachusetts 01760
Robert S. Feigelson
Affiliation:
Materials Science & Engineering, Stanford University, Stanford, California 94305
*
a) Address all correspondence to this author. e-mail: flruta@stanford.edu
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Abstract

Cs2LiYCl6 (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, Cs3YCl6 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 Cs2YCl5–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 Cs3YCl6 and maintained a low concentration of LiCl.

Keywords

phase equilibriacrystal growthsecondary phases
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2373 - 2380
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Scott T. Misture

References

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