کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1683979 | 1518755 | 2009 | 4 صفحه PDF | دانلود رایگان |
In order to investigate the formation and the annealing of defects, x- and z -cut lithium niobate (LiNbO3LiNbO3) crystals were irradiated with 200 keV He-ions at a temperature of 100 K. Subsequently, thermal treatment was performed at temperatures of 250 °C and 300 °C, respectively. The defect concentration was measured by means of Rutherford-backscattering spectroscopy (RBS) using 1.4 MeV He-ions immediately after the irradiation at 100 K, after warming to room temperature as well as after thermal treatment. After the irradiation the x-cut crystal is apparently more damaged compared to z -cut which is a consequence of the preferential arrangement of displaced Nb-atoms on vacant octahedral sites. Upon thermal treatment the samples show a completely different annealing behavior. At an ion fluence of 1×1016cm-2, the defect concentration decreases for x-cut material, but increases for z-cut samples with increasing annealing time. This is explained by the formation of aligned dislocation loops during the thermal treatment.
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 267, Issues 8–9, 1 May 2009, Pages 1492–1495