Abstract
Large GdCa 4O(BO 3) 3 crystal has been grown by the Czochralski method. The quality of GdCa 4O(BO 3) 3 crystal was assessed by white-beam synchrotron radiation topography. It has been found that there is a sub-grain boundary in the GdCa 4O(BO 3) 3 crystal. The boundary divides the large GdCa 4O(BO 3) 3 crystal into two individuals. Due to the misorientation between the two individuals, the image shifts can be observed in the synchrotron topographs. Based on the misorientation determined by high resolution X-ray diffractometer, the image shifts were calculated for several reflections. The calculations are in agreement with the measurements from the topographs very well. In addition, the formation mechanism of sub-grain boundary is discussed.
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