Abstract:The extended defects of lithium tantalate (LiTaOa) have been studied by reflection and transmission topography using the white radiation delivered by the DCI Synchrotron at LURE (Orsay, France). Some low-angle subgrains were observed in slices cut perpendicularly to the Y, Y-45 ° and Z directions. The typical size of the subgrains is a few cm 3. Dislocations were imaged in thin plates; their density was found to be in the region of several hundred per cm 2. The high intensity of the synchrotron source has pe… Show more
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