Alexander-haasen model of basal plane dislocations in single-crystal sapphire

B. Gao, S. Nakano, N. Miyazaki, K. Kakimoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Alexander-Haasen model was originally used to model the multiplication of the mobile dislocations in crystalline silicon. Here, we extend this model for studying multiplication of basal plane dislocations (BPDs) in single-crystal sapphire. By fitting the Alexander-Haasen model to experimental data, we find that the model accurately describes the plastic deformation of sapphire caused by BPDs. The application of the Alexander-Haasen model to sapphire growth made it possible to minimize the dislocation density and residual stress in growing crystals by optimizing the furnace structure and operation conditions. We apply the Alexander-Haasen model to investigate the dynamical deformation of single-crystal sapphire during the cooling process and examine the effect of the cooling rate on the generation of BPDs and residual stress. Finally, we present the BPD distribution and discuss the main factor that influences the generation of BPDs.

Original languageEnglish
Pages (from-to)4080-4086
Number of pages7
JournalCrystal Growth and Design
Volume14
Issue number8
DOIs
Publication statusPublished - Aug 6 2014

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Aluminum Oxide
Dislocations (crystals)
Sapphire
sapphire
Single crystals
single crystals
multiplication
residual stress
Residual stresses
Cooling
cooling
Silicon
Crystal growth
plastic deformation
furnaces
Plastic deformation
Furnaces
Crystalline materials
silicon
crystals

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Alexander-haasen model of basal plane dislocations in single-crystal sapphire. / Gao, B.; Nakano, S.; Miyazaki, N.; Kakimoto, K.

In: Crystal Growth and Design, Vol. 14, No. 8, 06.08.2014, p. 4080-4086.

Research output: Contribution to journalArticle

Gao, B. ; Nakano, S. ; Miyazaki, N. ; Kakimoto, K. / Alexander-haasen model of basal plane dislocations in single-crystal sapphire. In: Crystal Growth and Design. 2014 ; Vol. 14, No. 8. pp. 4080-4086.
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