Abstract
Dislocations in barium nitrate crystals grown from an aqueous solution were investigated by means of polarizing microscopy and X-ray topography. A perfect one-to-one correlation between dislocation images observed by X-ray topography and polarizing microscopy was confirmed. X-ray topographic observations showed that three types of dislocations can be observed in a (111) growth sector of a barium nitrate crystal: edge dislocations with b = 〈 110〉 , mixed dislocations with b = 〈110〉 and screw dislocations with b = [111]. It was established that these three types of dislocations can be imaged and clearly distinguished by polarizing microscopy.
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