N. B. Singh,1 W. M. B. Duval,2 R. H. Hopkins,3 R. Mazelsky,3 D. K. Fox,3 M. Gottlieb,3 T. Henningsen,3 S. R. Coriell,4 M. E. Glicksman5
1Univ. of Maryland, Baltimore County (United States) 2NASA Glenn Research Ctr. (United States) 3Hopkins Inc. (United States) 4Consultant (United States) 5Florida Institute of Technology (United States)
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Experiments were performed with pure and doped lead halides to investigate growth conditions for large crystals.
Direct observations during the growth of 25 mm diameter crystal growing at high velocities showed that torodial
type instability is formed at the solid/liquid interface during the growth. These instabilities translate into point
defects and line defects. We report the results of extensive experiments on Lead bromide doped with silver bromide
to study double diffusive transport. Control of instability at the interface provides a great improvement in the quality
of crystal more specifically point defects and line defects. The controlled doping controls the defects and
polytypism, and hence reduces the cracking and production of very large diameter good quality crystal is possible by
Bridgman method. Results on the quality as the function of convection and growth parameters are reported in this
paper.
N. B. Singh,W. M. B. Duval,R. H. Hopkins,R. Mazelsky,D. K. Fox,M. Gottlieb,T. Henningsen,S. R. Coriell, andM. E. Glicksman
"Control of the polytypes and line defects in radiation detector materials", Proc. SPIE 8507, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV, 85070N (24 October 2012); https://doi.org/10.1117/12.928472
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N. B. Singh, W. M. B. Duval, R. H. Hopkins, R. Mazelsky, D. K. Fox, M. Gottlieb, T. Henningsen, S. R. Coriell, M. E. Glicksman, "Control of the polytypes and line defects in radiation detector materials," Proc. SPIE 8507, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV, 85070N (24 October 2012); https://doi.org/10.1117/12.928472