Dislocation reaction mechanism of microcrack formation in (Cd, Mn) Te crystal

•Most of perfect dislocations dissociate into partials in the (Cd, Mn)Te crystal.•The synthesized partials are prone to generate the nipped stair rod.•A Z-shape faulted dipole is locked by two stair rod dislocations.•The dislocations sliding on the (1¯11)plane pile up to induce the S-shape microcrac...

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Bibliographic Details
Published in:Journal of crystal growth 2020-10, Vol.547, p.125791, Article 125791
Main Authors: Luan, Lijun, Gao, Li, Liu, Hongwei, wen Liu, Zong, Yu, Pengfei, Wang, Tao, Duan, Li, Jin, Peng
Format: Article
Language:English
Subjects:
A1. Microcrack
A1. Stacking Fault
A1. Stair Rod Dislocation
B2. (Cd, Mn) Te Crystal
Cadmium
Crystal dislocations
Crystals
Dipoles
Locking
Manganese
Microcracks
Reaction mechanisms
Shape effects
Single crystals
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Summary:•Most of perfect dislocations dissociate into partials in the (Cd, Mn)Te crystal.•The synthesized partials are prone to generate the nipped stair rod.•A Z-shape faulted dipole is locked by two stair rod dislocations.•The dislocations sliding on the (1¯11)plane pile up to induce the S-shape microcrack. The formation of a faulted dipole shaped like a letter Z (Z-shape) and a microcrack shaped like a letter S (S-shape) was investigated in (Cd, Mn) Te single crystal by transmission electron microscopy. Dislocations around the microcrack were determined as perfect dislocations and Shockley partial dislocations (partials) by different two-beam conditions. The nipped stair rod dislocation was produced by the interaction of two partials lying on mutually inclined {111} planes. The faulted dipole was generated by two partials moving toward the opposite directions on parallel {111} planes. Owing to the locking effect of Z-shape faulted dipole, the S-shape microcrack occurred along [111¯] direction.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2020.125791