A study of the perfection of flux-grown rare earth vanadates by X-ray topography
The perfection of crystals of TbVO4 and TmVO4, which were grown from Pb2V2O7 flux by slow cooling and recovered by using a hot pouring technique, has been studied by X-ray anomalous transmission topography. The dislocation density was found to be very low (≲ 102 cm-2) except in the regions immediately behind the termination facets. Most of the contrast in the topographs was due to precipitates and a strained layer or "skin" at the surface of the crystals, and this contrast was appreciably changed by annealing at a high temperature. Evidence of plastic deformation was found in some crystals, but dislocations due to gross flux inclusions extended only for short distances and nearly perfect material was found between inclusions. The perfection of solid solutions of (Tm, Lu)VO4 and (Tb, Gd)VO4 was found to be comparable with that of TmVO4 and TbVO4. © 1975.
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