In-situ observation of phase separation during growth of Cs2LiLaBr6:Ce crystals using energy-resolved neutron imaging

Anton S. Tremsin, Didier Perrodin, Adrian S. Losko, Sven C. Vogel, Takenao Shinohara, Kenichi Oikawa, Jeff H. Peterson, Chang Zhang, Jeffrey J. Derby, Alexander M. Zlokapa, Gregory A. Bizarri, Edith D. Bourret

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19 Scopus citations


In-situ imaging and characterization of Cs2LiLaBr6:Ce crystal growth are performed utilizing energyresolved neutron imaging. The unique capability of neutrons to penetrate the furnace and to provide direct information on the materials within the furnace is used to visualize the growth dynamics, location, and shape of the liquid/solid interface and to map the elemental composition. Nontrivial dynamics of phase separation within the liquid and solid phases were observed and investigated. Quantitative projected two-dimensional maps of Li concentrations were obtained with submillimeter spatial resolution delineating Li-rich and Li-depleted areas. Concurrent variations in Cs and Br concentrations were identified. Good transparency was obtained in part of the ingot where the liquid phase separation has reached steady state, suggesting that nonstoichiometric materials may be optimal for the original charge. The results demonstrate that energy-resolved neutron imaging and its associated modalities can provide unique information for the optimization of crystal growth conditions, in particular having the potential to accelerate scale-up from laboratory to commercial production by improving the yield and quality of single crystal materials.

Original languageEnglish (US)
Pages (from-to)6372-6381
Number of pages10
JournalCrystal Growth and Design
Issue number12
StatePublished - Dec 6 2017

Bibliographical note

Funding Information:
The authors would like to acknowledge the beamtime allocated at the Lujan Neutron Scattering Center at Los Alamos National Laboratory and Materials and Life Sciences Facility at J-PARC. We also thank David Wilson (LBNL) for his valuable help with the experimental hardware. This work was supported by the U.S. Department of Energy/NNSA/DNN R&D and managed by Lawrence Berkeley National Laboratory under Contract No. AC02-05CH11231. We also would like to acknowledge the generous donations of Virtex FPGAs and the Vivado design suite by Xilinx Inc. of San Jose, California, through the Xilinx University Program.

Publisher Copyright:
© 2017 American Chemical Society.


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