A Bjerrum defect refers to a type of point defect in ionic crystals, specifically concerning the arrangement and behavior of ions within the crystal lattice. It is named after the Danish physicist Niels Bjerrum, who studied such defects in detail. In ionic crystals, a Bjerrum defect typically arises due to a pair of neighboring ions, where one ion is missing (vacancy), and an adjacent ion becomes charged (often referred to as a "half" defect).
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