Abstract
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+.
Published Version
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