Analysis of chemical stress and the propensity for cracking during the vertical Bridgman growth of BaBrCl:Eu

Chang Zhang, Bing Gao, Anton S. Tremsin, Didier Perrodin, Tetiana Shalapska, Edith D. Bourret, Drew R. Onken, Sven C. Vogel, Jeffrey J. Derby

Research output: Contribution to journalArticlepeer-review

Abstract

Computational models are employed to analyze residual chemical stresses arising from compositional variations in europium-doped BaBrCl crystals grown by the vertical Bridgman method. We find that significant chemical stress is produced by radial segregation of Eu in this system. In particular, the distribution of normal stresses is set by the radial concentration gradient, whose changing sign produces surface states in tension or compression. Crack opening from surface flaws will be promoted or suppressed by tensile or compressive surface stresses, respectively. Thus, crystal growth processing strategies that change the radial dopant concentration gradients are posited to affect the propensity for cracking. For this system, surface stresses are changed from states of tension to compression when the growth rate is increased, thus improving the chances to avoid cracking—a strategy that defies classical wisdom that dictates slower growth to improve outcomes. Similar strategies affecting segregation may prove beneficial to tailor chemical stress fields to reduce cracking in other crystal growth systems.

Original languageEnglish (US)
Article number125794
JournalJournal of Crystal Growth
Volume546
DOIs
StatePublished - Sep 15 2020

Bibliographical note

Funding Information:
This work was supported in part by the funding of project LB15-ML-GammaDetMater-PD3Jf by the U.S. Department of Energy/NNSA/DNN R&D, under Awards DE-AC02-05CH11231 (managed by Lawrence Berkeley National Laboratory) and DE-NA0002514; no official endorsement should be inferred. We would like to acknowledge A. Yeckel for technical assistance with the Cats2D code and D. Poerschke for useful discussion on the effects of the Eu ionic radius to produce local strain.

Funding Information:
This work was supported in part by the funding of project LB15-ML-GammaDetMater-PD3Jf by the U.S. Department of Energy/NNSA/DNN R&D , under Awards DE-AC02-05CH11231 (managed by Lawrence Berkeley National Laboratory ) and DE-NA0002514 ; no official endorsement should be inferred. We would like to acknowledge A. Yeckel for technical assistance with the Cats2D code and D. Poerschke for useful discussion on the effects of the Eu ionic radius to produce local strain.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • A1. Chemical stress
  • A1. Computer simulation
  • A1. Convection
  • A1. Segregation
  • A2. Bridgman technique
  • B2. Scintillator materials

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