Interaction between dislocation and divalent impurity in KBr single crystals

Interaction between dislocation and divalent impurity has been investigated in KBr single crystals doped with various impurities by strain rate cycling tests under ultrasonic oscillation. The interaction energy between dislocation and impurity-vacancy dipole (I-V dipole) has been obtained by fitting...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2009-07, Vol.3 (1), p.012021-6
Main Authors: Ohgaku, T, Matsunaga, T
Format: Article
Language:English
Subjects:
Calcium ions
Crystal dislocations
Dipoles
Impurities
Single crystals
Strain rate
Vacancies
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Summary:Interaction between dislocation and divalent impurity has been investigated in KBr single crystals doped with various impurities by strain rate cycling tests under ultrasonic oscillation. The interaction energy between dislocation and impurity-vacancy dipole (I-V dipole) has been obtained by fitting Barnett model to experimental results. The interaction energies between dislocation and I-V dipole were determined to be 0.51, 0.30, 0.23 and 0.36eV for Ba2+, Sr2+, Ca2+ and Mg2+, respectively. The energy increases with increasing ionic radius of divalent impurity except Mg2+. This may be because the I-V dipole is made of a divalent impurity and a nearest vacancy for Ba2+, Sr2+ and Ca2+ but of a divalent one and a next nearest vacancy for Mg2+.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/3/1/012021